IDE-RAID Drive Performance

IDE-RAID Drive Performance

[Nicklas Bondesson]

Hi!

I think i'm getting really bad values from my disks. It's two Western
Digital WD800JB-00DUA3 (Special Edition 8 MB cache) disks connected to a
Promise TX2000 (PDC20271) card (RAID1 using ataraid under Linux 2.4.23).

The disks are setup with hdparm at boot time:

/sbin/hdparm -X69 -d1 -u1 -m16 -c3 /dev/hda 
/sbin/hdparm -X69 -d1 -u1 -m16 -c3 /dev/hdc

When running hdparm -tT I get the following:

/dev/hda:
 Timing buffer-cache reads:   128 MB in  1.13 seconds =113.27 MB/sec
 Timing buffered disk reads:  64 MB in  2.46 seconds = 26.02 MB/sec

/dev/hdc:
 Timing buffer-cache reads:   128 MB in  1.13 seconds =113.27 MB/sec
 Timing buffered disk reads:  64 MB in  2.47 seconds = 25.91 MB/sec

Are these normal values? I don't think so. Please advise.

/Nicke

Re: IDE-RAID Drive Performance

[Nuno Alexandre]

[-- Attachment #1: Type: text/plain, Size: 1391 bytes --]

On Tue, 30 Dec 2003 11:44:01 +0100 
Mr(s): Nicklas Bondesson wrote:

> Hi!
> 
> I think i'm getting really bad values from my disks. It's two Western
> Digital WD800JB-00DUA3 (Special Edition 8 MB cache) disks connected to a
> Promise TX2000 (PDC20271) card (RAID1 using ataraid under Linux 2.4.23).
> 
> The disks are setup with hdparm at boot time:
> 
> /sbin/hdparm -X69 -d1 -u1 -m16 -c3 /dev/hda 
> /sbin/hdparm -X69 -d1 -u1 -m16 -c3 /dev/hdc
> 
> When running hdparm -tT I get the following:
> 
> /dev/hda:
>  Timing buffer-cache reads:   128 MB in  1.13 seconds =113.27 MB/sec
>  Timing buffered disk reads:  64 MB in  2.46 seconds = 26.02 MB/sec
> 
> /dev/hdc:
>  Timing buffer-cache reads:   128 MB in  1.13 seconds =113.27 MB/sec
>  Timing buffered disk reads:  64 MB in  2.47 seconds = 25.91 MB/sec
> 
> Are these normal values? I don't think so. Please advise.
> 
> /Nicke

Hi.
This is what i get with a Maxtor 6Y120L0 (2MB cache):

/dev/hda:
 Timing buffer-cache reads:   1320 MB in  2.00 seconds = 659.44 MB/sec
 Timing buffered disk reads:  140 MB in  3.02 seconds =  46.40 MB/sec

Using:
-d1 -u1 -m16 -c3 -W1 -A1 -k1 -X70 -a 8192

I'm not using raid, its a single disk connected to IDE1 on the motherboard.

Maybe you can try those parameters and see if it helps :)
-- 
Best regards - Nuno Alexandre - na@imaginere.dk
Gpg: EA74637D - http://imaginere.dk - iM:ikaro@jabber.org

[-- Attachment #2: Type: application/pgp-signature, Size: 189 bytes --]

Re: IDE-RAID Drive Performance

[Bob]

Nuno Alexandre wrote:

>On Tue, 30 Dec 2003 11:44:01 +0100 
>Mr(s): Nicklas Bondesson wrote:
>
>  
>
>>Hi!
>>
>>I think i'm getting really bad values from my disks. It's two Western
>>Digital WD800JB-00DUA3 (Special Edition 8 MB cache) disks connected to a
>>Promise TX2000 (PDC20271) card (RAID1 using ataraid under Linux 2.4.23).
>>
>>The disks are setup with hdparm at boot time:
>>
>>/sbin/hdparm -X69 -d1 -u1 -m16 -c3 /dev/hda 
>>/sbin/hdparm -X69 -d1 -u1 -m16 -c3 /dev/hdc
>>
>>When running hdparm -tT I get the following:
>>
>>/dev/hda:
>> Timing buffer-cache reads:   128 MB in  1.13 seconds =113.27 MB/sec
>> Timing buffered disk reads:  64 MB in  2.46 seconds = 26.02 MB/sec
>>
>>/dev/hdc:
>> Timing buffer-cache reads:   128 MB in  1.13 seconds =113.27 MB/sec
>> Timing buffered disk reads:  64 MB in  2.47 seconds = 25.91 MB/sec
>>
>>Are these normal values? I don't think so. Please advise.
>>
>>/Nicke
>>    
>>
>
>Hi.
>This is what i get with a Maxtor 6Y120L0 (2MB cache):
>
>/dev/hda:
> Timing buffer-cache reads:   1320 MB in  2.00 seconds = 659.44 MB/sec
> Timing buffered disk reads:  140 MB in  3.02 seconds =  46.40 MB/sec
>
>Using:
>-d1 -u1 -m16 -c3 -W1 -A1 -k1 -X70 -a 8192
>
>I'm not using raid, its a single disk connected to IDE1 on the motherboard.
>
>Maybe you can try those parameters and see if it helps :)
>  
>
I have two promise cards and four Maxtor
DiamondMax Plus9 60G with 8MB cache each
hdparm -d1 -u1 -m16 -c1 -W1 -A1 -k1 -X70 -a 8192

and my raid0 is software, linux, not the promise chip's raid

on each drive I see 900 MB/s 47.2 MB/s
and on /dev/md/2 /tmp with four drives
four partitions I see 900 MB/s 94 MB/s

that's with 64k raid chunk, reiser 4096b blocks

Linux says 2048k raid chunk would minimize
seek time for better real world performance. It
doesn't work better with hdparm -tT but that's not
realworld. My version of reiserfs doesn't allow
changing the block size.

-Bob D

Re: IDE-RAID Drive Performance

[Andre Tomt]

On Tue, 2003-12-30 at 12:21, Nuno Alexandre wrote:
> /dev/hda:
>  Timing buffer-cache reads:   1320 MB in  2.00 seconds = 659.44 MB/sec
>  Timing buffered disk reads:  140 MB in  3.02 seconds =  46.40 MB/sec
> 
> Using:
> -d1 -u1 -m16 -c3 -W1 -A1 -k1 -X70 -a 8192

Wow, slow down for a minute. Most IDE chipset drivers does a excellent
job at autotuning the max *safe settings* for your drive/chipset
combination. Mucking around with hdparm parameters blindfolded will only
cause you grief in form of data loss and system instability sooner than
later.

Usually when one gets into performance problems with IDE in Linux, the
chipset specific driver is not enabled, making the system fallback to
the generic driver - OR the drive and controller combination is
considered unsafe with faster settings.

Without any user intervention at all, my Seagate 7200 120G's does 55MB/s
in the infamious hdparm test, on a VIA KT266 based board, both in
2.6.1-rc1 and 2.4.23.

RE: IDE-RAID Drive Performance

[Nicklas Bondesson]

I don't know if you have read my latest post regarding this. anyway here it
is :)

It was the PCI latency value that was wrong. It was set to 0 in the BIOS so
I have changed it now to 64. I now get the following figures! :) BTW I'm
running two Western Digital WD800JB-00DUA3 (Special Edition 8 MB cache)
disks connected to a Promise TX2000 (PDC20271) card (RAID1 using ataraid
(pdcraid) drivers).

hdparm:

/dev/hda:
 Timing buffer-cache reads:   128 MB in  1.12 seconds =114.29 MB/sec
 Timing buffered disk reads:  64 MB in  1.53 seconds = 41.83 MB/sec

bonnie:

Version 1.02b       ------Sequential Output------ --Sequential Input-
--Random-
                    -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
--Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec
%CP
gollum         800M  4681  98 37827  76 17590  30  4888  95 39400  26 310.4
3
                    ------Sequential Create------ --------Random
Create--------
                    -Create-- --Read--- -Delete-- -Create-- --Read---
-Delete--
              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec
%CP
                 16   310  99 +++++ +++ 21319 100   329  99 +++++ +++  1766
96
gollum,800M,4681,98,37827,76,17590,30,4888,95,39400,26,310.4,3,16,310,99,+++
++,+++,21319,100,329,99,+++++,+++,1766,96 

Thanks for the help!

/Nicke 

-----Original Message-----
From: Andre Tomt [mailto:lkml@tomt.net] 
Sent: den 3 januari 2004 15:00
To: Nuno Alexandre
Cc: linux-kernel@vger.kernel.org; Nicklas Bondesson
Subject: Re: IDE-RAID Drive Performance

On Tue, 2003-12-30 at 12:21, Nuno Alexandre wrote:
> /dev/hda:
>  Timing buffer-cache reads:   1320 MB in  2.00 seconds = 659.44 MB/sec
>  Timing buffered disk reads:  140 MB in  3.02 seconds =  46.40 MB/sec
> 
> Using:
> -d1 -u1 -m16 -c3 -W1 -A1 -k1 -X70 -a 8192

Wow, slow down for a minute. Most IDE chipset drivers does a excellent job
at autotuning the max *safe settings* for your drive/chipset combination.
Mucking around with hdparm parameters blindfolded will only cause you grief
in form of data loss and system instability sooner than later.

Usually when one gets into performance problems with IDE in Linux, the
chipset specific driver is not enabled, making the system fallback to the
generic driver - OR the drive and controller combination is considered
unsafe with faster settings.

Without any user intervention at all, my Seagate 7200 120G's does 55MB/s in
the infamious hdparm test, on a VIA KT266 based board, both in
2.6.1-rc1 and 2.4.23.

RE: IDE-RAID Drive Performance

[Nicklas Bondesson]

I don't know if you have read my latest post regarding this. anyway here it
is :)

It was the PCI latency value that was wrong. It was set to 0 in the BIOS so
I have changed it now to 64. I now get the following figures! :) BTW I'm
running two Western Digital WD800JB-00DUA3 (Special Edition 8 MB cache)
disks connected to a Promise TX2000 (PDC20271) card (RAID1 using ataraid
(pdcraid) drivers).

hdparm:

/dev/hda:
 Timing buffer-cache reads:   128 MB in  1.12 seconds =114.29 MB/sec
 Timing buffered disk reads:  64 MB in  1.53 seconds = 41.83 MB/sec

bonnie:

Version 1.02b       ------Sequential Output------ --Sequential Input-
--Random-
                    -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
--Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec
%CP
gollum         800M  4681  98 37827  76 17590  30  4888  95 39400  26 310.4
3
                    ------Sequential Create------ --------Random
Create--------
                    -Create-- --Read--- -Delete-- -Create-- --Read---
-Delete--
              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec
%CP
                 16   310  99 +++++ +++ 21319 100   329  99 +++++ +++  1766
96
gollum,800M,4681,98,37827,76,17590,30,4888,95,39400,26,310.4,3,16,310,99,+++
++,+++,21319,100,329,99,+++++,+++,1766,96 

Thanks for the help!

/Nicke 

-----Original Message-----
From: Andre Tomt [mailto:lkml@tomt.net] 
Sent: den 3 januari 2004 15:00
To: Nuno Alexandre
Cc: linux-kernel@vger.kernel.org; Nicklas Bondesson
Subject: Re: IDE-RAID Drive Performance

On Tue, 2003-12-30 at 12:21, Nuno Alexandre wrote:
> /dev/hda:
>  Timing buffer-cache reads:   1320 MB in  2.00 seconds = 659.44 MB/sec
>  Timing buffered disk reads:  140 MB in  3.02 seconds =  46.40 MB/sec
> 
> Using:
> -d1 -u1 -m16 -c3 -W1 -A1 -k1 -X70 -a 8192

Wow, slow down for a minute. Most IDE chipset drivers does a excellent job
at autotuning the max *safe settings* for your drive/chipset combination.
Mucking around with hdparm parameters blindfolded will only cause you grief
in form of data loss and system instability sooner than later.

Usually when one gets into performance problems with IDE in Linux, the
chipset specific driver is not enabled, making the system fallback to the
generic driver - OR the drive and controller combination is considered
unsafe with faster settings.

Without any user intervention at all, my Seagate 7200 120G's does 55MB/s in
the infamious hdparm test, on a VIA KT266 based board, both in
2.6.1-rc1 and 2.4.23.

RE: IDE-RAID Drive Performance

[Nicklas Bondesson]

I don't know if you have read my latest post regarding this. anyway here it
is :)

It was the PCI latency value that was wrong. It was set to 0 in the BIOS so
I have changed it now to 64. I now get the following figures! :) BTW I'm
running two Western Digital WD800JB-00DUA3 (Special Edition 8 MB cache)
disks connected to a Promise TX2000 (PDC20271) card (RAID1 using ataraid
(pdcraid) drivers).

hdparm:

/dev/hda:
 Timing buffer-cache reads:   128 MB in  1.12 seconds =114.29 MB/sec
 Timing buffered disk reads:  64 MB in  1.53 seconds = 41.83 MB/sec

bonnie:

Version 1.02b       ------Sequential Output------ --Sequential Input-
--Random-
                    -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
--Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec
%CP
gollum         800M  4681  98 37827  76 17590  30  4888  95 39400  26 310.4
3
                    ------Sequential Create------ --------Random
Create--------
                    -Create-- --Read--- -Delete-- -Create-- --Read---
-Delete--
              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec
%CP
                 16   310  99 +++++ +++ 21319 100   329  99 +++++ +++  1766
96
gollum,800M,4681,98,37827,76,17590,30,4888,95,39400,26,310.4,3,16,310,99,+++
++,+++,21319,100,329,99,+++++,+++,1766,96 

Thanks for the help!

/Nicke 

-----Original Message-----
From: Andre Tomt [mailto:lkml@tomt.net] 
Sent: den 3 januari 2004 15:00
To: Nuno Alexandre
Cc: linux-kernel@vger.kernel.org; Nicklas Bondesson
Subject: Re: IDE-RAID Drive Performance

On Tue, 2003-12-30 at 12:21, Nuno Alexandre wrote:
> /dev/hda:
>  Timing buffer-cache reads:   1320 MB in  2.00 seconds = 659.44 MB/sec
>  Timing buffered disk reads:  140 MB in  3.02 seconds =  46.40 MB/sec
> 
> Using:
> -d1 -u1 -m16 -c3 -W1 -A1 -k1 -X70 -a 8192

Wow, slow down for a minute. Most IDE chipset drivers does a excellent job
at autotuning the max *safe settings* for your drive/chipset combination.
Mucking around with hdparm parameters blindfolded will only cause you grief
in form of data loss and system instability sooner than later.

Usually when one gets into performance problems with IDE in Linux, the
chipset specific driver is not enabled, making the system fallback to the
generic driver - OR the drive and controller combination is considered
unsafe with faster settings.

Without any user intervention at all, my Seagate 7200 120G's does 55MB/s in
the infamious hdparm test, on a VIA KT266 based board, both in
2.6.1-rc1 and 2.4.23.

RE: IDE-RAID Drive Performance

[Nicklas Bondesson]

This is what a cat /proc/pci looks like (promise details): It doesn't say
anything about the latency.

Bus  0, device   9, function  0:
    RAID bus controller: Promise Technology, Inc. PDC20271 (rev 2).
      IRQ 7.
      Master Capable.  No bursts.  Min Gnt=4.Max Lat=18.
      I/O at 0xd000 [0xd007].
      I/O at 0xb800 [0xb803].
      I/O at 0xb400 [0xb407].
      I/O at 0xb000 [0xb003].
      I/O at 0xa800 [0xa80f].
      Non-prefetchable 32 bit memory at 0xe0000000 [0xe000ffff]. 

/Nicke

-----Original Message-----
From: Mark Hahn [mailto:hahn@physics.mcmaster.ca] 
Sent: den 30 december 2003 19:14
To: Nicklas Bondesson
Subject: Re: IDE-RAID Drive Performance

> The disks are setup with hdparm at boot time:

not normally necessary or desirable.

> /dev/hda:
>  Timing buffer-cache reads:   128 MB in  1.13 seconds =113.27 MB/sec
>  Timing buffered disk reads:  64 MB in  2.46 seconds = 26.02 MB/sec

the 113 indicates that you're running on a fairly old/slow host.
as such, you cannot expect to achive the full disk bandwidth, though you can
probably do better than this by tweaking w/blockdev.
it's also worth checking your bios settings (pci latency too low?)

RE: IDE-RAID Drive Performance

[Nicklas Bondesson]

It was the PCI latency value that was wrong. It was set to 0 in the BIOS so
I have changed it now to 64. I now get the following figures! :)

hdparm:

/dev/hda:
 Timing buffer-cache reads:   128 MB in  1.12 seconds =114.29 MB/sec
 Timing buffered disk reads:  64 MB in  1.53 seconds = 41.83 MB/sec

bonnie:

Version 1.02b       ------Sequential Output------ --Sequential Input-
--Random-
                    -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
--Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec
%CP
gollum         800M  4681  98 37827  76 17590  30  4888  95 39400  26 310.4
3
                    ------Sequential Create------ --------Random
Create--------
                    -Create-- --Read--- -Delete-- -Create-- --Read---
-Delete--
              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec
%CP
                 16   310  99 +++++ +++ 21319 100   329  99 +++++ +++  1766
96
gollum,800M,4681,98,37827,76,17590,30,4888,95,39400,26,310.4,3,16,310,99,+++
++,+++,21319,100,329,99,+++++,+++,1766,96 

Thanks for the help!

/Nicke

-----Original Message-----
From: Mark Hahn [mailto:hahn@physics.mcmaster.ca] 
Sent: den 30 december 2003 19:14
To: Nicklas Bondesson
Subject: Re: IDE-RAID Drive Performance

> The disks are setup with hdparm at boot time:

not normally necessary or desirable.

> /dev/hda:
>  Timing buffer-cache reads:   128 MB in  1.13 seconds =113.27 MB/sec
>  Timing buffered disk reads:  64 MB in  2.46 seconds = 26.02 MB/sec

the 113 indicates that you're running on a fairly old/slow host.
as such, you cannot expect to achive the full disk bandwidth, though you can
probably do better than this by tweaking w/blockdev.
it's also worth checking your bios settings (pci latency too low?)

Re: IDE-RAID Drive Performance

[Willy Gardiol]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1


Now it sounds good!
If you are trying a raid0 please send bonnie's results for it... i am 
interested!

bye

Alle Wednesday 31 December 2003 00:26, Nicklas Bondesson ha scritto:
> It was the PCI latency value that was wrong. It was set to 0 in the BIOS so
> I have changed it now to 64. I now get the following figures! :)
>
> hdparm:
>
> /dev/hda:
>  Timing buffer-cache reads:   128 MB in  1.12 seconds =114.29 MB/sec
>  Timing buffered disk reads:  64 MB in  1.53 seconds = 41.83 MB/sec
>
> bonnie:
>
> Version 1.02b       ------Sequential Output------ --Sequential Input-
> --Random-
>                     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
> --Seeks--
> Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec
> %CP
> gollum         800M  4681  98 37827  76 17590  30  4888  95 39400  26 310.4
> 3
>                     ------Sequential Create------ --------Random
> Create--------
>                     -Create-- --Read--- -Delete-- -Create-- --Read---
> -Delete--
>               files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec
> %CP
>                  16   310  99 +++++ +++ 21319 100   329  99 +++++ +++  1766
> 96
> gollum,800M,4681,98,37827,76,17590,30,4888,95,39400,26,310.4,3,16,310,99,++
>+ ++,+++,21319,100,329,99,+++++,+++,1766,96
>
> Thanks for the help!
>
> /Nicke
>
> -----Original Message-----
> From: Mark Hahn [mailto:hahn@physics.mcmaster.ca]
> Sent: den 30 december 2003 19:14
> To: Nicklas Bondesson
> Subject: Re: IDE-RAID Drive Performance
>
> > The disks are setup with hdparm at boot time:
>
> not normally necessary or desirable.
>
> > /dev/hda:
> >  Timing buffer-cache reads:   128 MB in  1.13 seconds =113.27 MB/sec
> >  Timing buffered disk reads:  64 MB in  2.46 seconds = 26.02 MB/sec
>
> the 113 indicates that you're running on a fairly old/slow host.
> as such, you cannot expect to achive the full disk bandwidth, though you
> can probably do better than this by tweaking w/blockdev.
> it's also worth checking your bios settings (pci latency too low?)
>
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-ide" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

- -- 

! 
 Willy Gardiol - willy@gardiol.org
 www.gardiol.org
 Use linux for your freedom.

   "Cari fratelli dell'altra sponda
    cantammo in coro giù sulla terra
    amammo in cento l'identica donna
    partimmo in mille per la stessa guerra.

    Questo ricordo non vi consoli
    quando si muore si muore soli."

	(Il Testamento, Fabrizio De Andrè)


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RE: IDE-RAID Drive Performance

[Nicklas Bondesson]

Thanks for the info. What do you mean by "w/blockdev" and what should a
proper pci latency value bee?

/Nicke 

-----Original Message-----
From: Mark Hahn [mailto:hahn@physics.mcmaster.ca]
Sent: den 30 december 2003 19:14
To: Nicklas Bondesson
Subject: Re: IDE-RAID Drive Performance

> The disks are setup with hdparm at boot time:

not normally necessary or desirable.

> /dev/hda:
>  Timing buffer-cache reads:   128 MB in  1.13 seconds =113.27 MB/sec
>  Timing buffered disk reads:  64 MB in  2.46 seconds = 26.02 MB/sec

the 113 indicates that you're running on a fairly old/slow host.
as such, you cannot expect to achive the full disk bandwidth, though you can
probably do better than this by tweaking w/blockdev.
it's also worth checking your bios settings (pci latency too low?)

Re: IDE-RAID Drive Performance

[Willy Gardiol]

no, it is 4.648 kb/sec has it says on top.
It is right, you must check the "block" section, not the "char" section.
Reading char by char is always a pain. 

Indeed 20/24mb/sec is a small figure for your disks, i get up to 35mb/sec 
for one drive and 75mb/sec for raid0. 

Try to connect the disks on the onboard controller of the mainboard and run 
again bonnie, just to check if it is a ocntroller issue. 

Nicklas Bondesson Scrive: 

> This is what I get using bonnie: 
> 
> Is this correct 46.48 MB / sec ? 
> 
> gollum:~# bonnie -s 800 -u root
> Using uid:0, gid:0.
> Writing with putc()...done
> Writing intelligently...done
> Rewriting...done
> Reading with getc()...done
> Reading intelligently...done
> start 'em...done...done...done...
> Create files in sequential order...done.
> Stat files in sequential order...done.
> Delete files in sequential order...done.
> Create files in random order...done.
> Stat files in random order...done.
> Delete files in random order...done.
> Version 1.02b       ------Sequential Output------ --Sequential Input-
> --Random-
>                     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
> --Seeks--
> Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec
> %CP
> gollum         800M  4648  98 19443  37  8422  14  4859  94 24766  17 282.8
> 2
>                     ------Sequential Create------ --------Random
> Create--------
>                     -Create-- --Read--- -Delete-- -Create-- --Read---
> -Delete--
>               files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec
> %CP
>                  16   306  99 +++++ +++ 20985  99   319  99 +++++ +++  1683
> 97
> gollum,800M,4648,98,19443,37,8422,14,4859,94,24766,17,282.8,2,16,306,99,++++
> +,++
> +,20985,99,319,99,+++++,+++,1683,97  
> 
> -----Original Message-----
> From: linux-ide-owner@vger.kernel.org
> [mailto:linux-ide-owner@vger.kernel.org] On Behalf Of Willy Gardiol
> Sent: den 30 december 2003 12:12
> To: Nicklas Bondesson
> Cc: linux-ide@vger.kernel.org
> Subject: Re: IDE-RAID Drive Performance 
> 
> 
> Check you are using 80pin cables... but -X69 would fail if not.
> PCI bus should not be to blame for this, unless your is overloaded (?) like
> heavy network traffic (fast or gigabit ethernet) may steal PCI cycles, but i
> have never seen this happen in pc's...  
> 
> Maybe check your card is not sharing an IRQ, move into another slot, try
> some fixed allocation from BIOS to avoid this...
> But i whouldnt expect too much from this on the speed side (just in case
> some troubles with IRQ sharing).  
> 
> Are you using the new pdc driver? The new one is the one supporting newer
> chipsets like the 20271, i do not know which chip your promise has.  
> 
> Try Bonnie to get some real on-the-road measurement from ypur filesystems... 
> 
> that is the REAL speed you can get from your disks.  
> 
> 
> Nicklas Bondesson Scrive:  
> 
>> Ok, so you currently don't have any suggestions on this? Could it be a 
>> slow PCI slot causing the poor performance? It's an ASUS P2B (rev 
>> 1.04) motherboard with PCI 2.1 enabled in BIOS. 
>> 
>> /Nicke 
>> 
>> -----Original Message-----
>> From: Willy Gardiol [mailto:willy@gardiol.org]
>> Sent: den 30 december 2003 11:58
>> To: Nicklas Bondesson
>> Cc: linux-ide@vger.kernel.org
>> Subject: Re: IDE-RAID Drive Performance 
>> 
>> 
>> Every experience i had with Promise controllers AND linux 2.4.xx where 
>> xx is
>>> 17 has given me troubles both on x86 and sparc architecture with DMA
>> enabled.   
>> 
>> But i do not have enough time to troubleshoot this and i never got 
>> much attention here probably because i do not have any ooops or more 
>> specific data to report! 
>> 
>> Besides that, my maxtor 40gb (dont remember model right now) does 
>> about 40mb/sec instead of yours 25. 
>> 
>> Nicklas Bondesson Scrive:   
>> 
>>> Hi!   
>>> 
>>> I think i'm getting really bad values from my disks. It's two Western 
>>> Digital WD800JB-00DUA3 (Special Edition 8 MB cache) disks connected 
>>> to a Promise TX2000 (PDC20271) card (RAID1 using ataraid). 
>>> 
>>> The disks are setup with hdparm at boot time:   
>>> 
>>> /sbin/hdparm -X69 -d1 -u1 -m16 -c3 /dev/hda /sbin/hdparm -X69 -d1 -u1
>>> -m16 -c3 /dev/hdc 
>>> 
>>> When running hdparm -tT I get the following:   
>>> 
>>> /dev/hda:
>>>  Timing buffer-cache reads:   128 MB in  1.13 seconds =113.27 MB/sec
>>>  Timing buffered disk reads:  64 MB in  2.46 seconds = 26.02 MB/sec 
>>> 
>>> /dev/hdc:
>>>  Timing buffer-cache reads:   128 MB in  1.13 seconds =113.27 MB/sec
>>>  Timing buffered disk reads:  64 MB in  2.47 seconds = 25.91 MB/sec 
>>> 
>>> Are these normal values? I don't think so. Please advise.   
>>> 
>>> /Nicke 
>>> 
>>> -
>>> To unsubscribe from this list: send the line "unsubscribe linux-ide" 
>>> in the body of a message to majordomo@vger.kernel.org More majordomo 
>>> info at  http://vger.kernel.org/majordomo-info.html
>>    
>> 
>  
> -
> To unsubscribe from this list: send the line "unsubscribe linux-ide" in the
> body of a message to majordomo@vger.kernel.org More majordomo info at
> http://vger.kernel.org/majordomo-info.html 
> 
 

RE: IDE-RAID Drive Performance

[Nicklas Bondesson]

Look at this:

PDC20271: not 100% native mode: will probe irqs later
    ide0: BM-DMA at 0xa800-0xa807, BIOS settings: hda:pio, hdb:pio
    ide1: BM-DMA at 0xa808-0xa80f, BIOS settings: hdc:pio, hdd:pio

The controller is running in PIO mode not DMA. Could that have something to
do with the bad speed?

/Nicke

-----Original Message-----
From: linux-ide-owner@vger.kernel.org
[mailto:linux-ide-owner@vger.kernel.org] On Behalf Of Willy Gardiol
Sent: den 30 december 2003 16:22
To: Nicklas Bondesson
Cc: linux-ide@vger.kernel.org
Subject: Re: IDE-RAID Drive Performance


no, it is 4.648 kb/sec has it says on top.
It is right, you must check the "block" section, not the "char" section.
Reading char by char is always a pain. 

Indeed 20/24mb/sec is a small figure for your disks, i get up to 35mb/sec
for one drive and 75mb/sec for raid0. 

Try to connect the disks on the onboard controller of the mainboard and run
again bonnie, just to check if it is a ocntroller issue. 

Nicklas Bondesson Scrive: 

> This is what I get using bonnie: 
> 
> Is this correct 46.48 MB / sec ? 
> 
> gollum:~# bonnie -s 800 -u root
> Using uid:0, gid:0.
> Writing with putc()...done
> Writing intelligently...done
> Rewriting...done
> Reading with getc()...done
> Reading intelligently...done
> start 'em...done...done...done...
> Create files in sequential order...done.
> Stat files in sequential order...done.
> Delete files in sequential order...done.
> Create files in random order...done.
> Stat files in random order...done.
> Delete files in random order...done.
> Version 1.02b       ------Sequential Output------ --Sequential Input-
> --Random-
>                     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
> --Seeks--
> Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP
/sec
> %CP
> gollum         800M  4648  98 19443  37  8422  14  4859  94 24766  17
282.8
> 2
>                     ------Sequential Create------ --------Random
> Create--------
>                     -Create-- --Read--- -Delete-- -Create-- --Read---
> -Delete--
>               files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  
> /sec %CP
>                  16   306  99 +++++ +++ 20985  99   319  99 +++++ +++
1683
> 97
> gollum,800M,4648,98,19443,37,8422,14,4859,94,24766,17,282.8,2,16,306,9
> 9,++++
> +,++
> +,20985,99,319,99,+++++,+++,1683,97
> 
> -----Original Message-----
> From: linux-ide-owner@vger.kernel.org
> [mailto:linux-ide-owner@vger.kernel.org] On Behalf Of Willy Gardiol
> Sent: den 30 december 2003 12:12
> To: Nicklas Bondesson
> Cc: linux-ide@vger.kernel.org
> Subject: Re: IDE-RAID Drive Performance
> 
> 
> Check you are using 80pin cables... but -X69 would fail if not.
> PCI bus should not be to blame for this, unless your is overloaded (?) 
> like heavy network traffic (fast or gigabit ethernet) may steal PCI 
> cycles, but i have never seen this happen in pc's...
> 
> Maybe check your card is not sharing an IRQ, move into another slot, 
> try some fixed allocation from BIOS to avoid this...
> But i whouldnt expect too much from this on the speed side (just in 
> case some troubles with IRQ sharing).
> 
> Are you using the new pdc driver? The new one is the one supporting 
> newer chipsets like the 20271, i do not know which chip your promise has.
> 
> Try Bonnie to get some real on-the-road measurement from ypur
filesystems... 
> 
> that is the REAL speed you can get from your disks.  
> 
> 
> Nicklas Bondesson Scrive:  
> 
>> Ok, so you currently don't have any suggestions on this? Could it be 
>> a slow PCI slot causing the poor performance? It's an ASUS P2B (rev
>> 1.04) motherboard with PCI 2.1 enabled in BIOS. 
>> 
>> /Nicke
>> 
>> -----Original Message-----
>> From: Willy Gardiol [mailto:willy@gardiol.org]
>> Sent: den 30 december 2003 11:58
>> To: Nicklas Bondesson
>> Cc: linux-ide@vger.kernel.org
>> Subject: Re: IDE-RAID Drive Performance
>> 
>> 
>> Every experience i had with Promise controllers AND linux 2.4.xx 
>> where xx is
>>> 17 has given me troubles both on x86 and sparc architecture with DMA
>> enabled.   
>> 
>> But i do not have enough time to troubleshoot this and i never got 
>> much attention here probably because i do not have any ooops or more 
>> specific data to report!
>> 
>> Besides that, my maxtor 40gb (dont remember model right now) does 
>> about 40mb/sec instead of yours 25.
>> 
>> Nicklas Bondesson Scrive:   
>> 
>>> Hi!   
>>> 
>>> I think i'm getting really bad values from my disks. It's two 
>>> Western Digital WD800JB-00DUA3 (Special Edition 8 MB cache) disks 
>>> connected to a Promise TX2000 (PDC20271) card (RAID1 using ataraid).
>>> 
>>> The disks are setup with hdparm at boot time:   
>>> 
>>> /sbin/hdparm -X69 -d1 -u1 -m16 -c3 /dev/hda /sbin/hdparm -X69 -d1 
>>> -u1
>>> -m16 -c3 /dev/hdc
>>> 
>>> When running hdparm -tT I get the following:   
>>> 
>>> /dev/hda:
>>>  Timing buffer-cache reads:   128 MB in  1.13 seconds =113.27 MB/sec
>>>  Timing buffered disk reads:  64 MB in  2.46 seconds = 26.02 MB/sec
>>> 
>>> /dev/hdc:
>>>  Timing buffer-cache reads:   128 MB in  1.13 seconds =113.27 MB/sec
>>>  Timing buffered disk reads:  64 MB in  2.47 seconds = 25.91 MB/sec
>>> 
>>> Are these normal values? I don't think so. Please advise.   
>>> 
>>> /Nicke
>>> 
>>> -
>>> To unsubscribe from this list: send the line "unsubscribe linux-ide" 
>>> in the body of a message to majordomo@vger.kernel.org More majordomo 
>>> info at  http://vger.kernel.org/majordomo-info.html
>>    
>> 
>  
> -
> To unsubscribe from this list: send the line "unsubscribe linux-ide" 
> in the body of a message to majordomo@vger.kernel.org More majordomo 
> info at http://vger.kernel.org/majordomo-info.html
> 
 
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To unsubscribe from this list: send the line "unsubscribe linux-ide" in the
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RE: IDE-RAID Drive Performance

[Bartlomiej Zolnierkiewicz]

No, that are only BIOS settings.
Driver may reprogram the controller.

On Tue, 30 Dec 2003, Nicklas Bondesson wrote:
> Look at this:
>
> PDC20271: not 100% native mode: will probe irqs later
>     ide0: BM-DMA at 0xa800-0xa807, BIOS settings: hda:pio, hdb:pio
>     ide1: BM-DMA at 0xa808-0xa80f, BIOS settings: hdc:pio, hdd:pio
>
> The controller is running in PIO mode not DMA. Could that have something to
> do with the bad speed?

Re: IDE-RAID Drive Performance

[uaca]

On Tue, Dec 30, 2003 at 11:41:47AM +0100, Nicklas Bondesson wrote:
> Hi!
> 
> I think i'm getting really bad values from my disks. It's two Western
> Digital WD800JB-00DUA3 (Special Edition 8 MB cache) disks connected to a
> Promise TX2000 (PDC20271) card (RAID1 using ataraid).

I think I have the same/similar drive, my results

(after trying to flush disk cache by doing a find /)

root@agapito:~# hdparm -t /dev/hda

/dev/hda:
 Timing buffered disk reads:  124 MB in  3.03 seconds =  40.92 MB/sec

(without pause)
root@agapito:~# hdparm -t /dev/hda

/dev/hda:
 Timing buffered disk reads:  132 MB in  3.01 seconds =  43.86 MB/sec
root@agapito:~# hdparm -i /dev/hda

/dev/hda:

 Model=WDC WD800JB-00CRA1, FwRev=17.07W17, SerialNo=WD-WMA8E4519860
 Config={ HardSect NotMFM HdSw>15uSec SpinMotCtl Fixed DTR>5Mbs FmtGapReq }
 RawCHS=16383/16/63, TrkSize=57600, SectSize=600, ECCbytes=40
 BuffType=DualPortCache, BuffSize=8192kB, MaxMultSect=16, MultSect=16
 CurCHS=4047/16/255, CurSects=16511760, LBA=yes, LBAsects=156301488
 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4
 DMA modes:  mdma0 mdma1 mdma2
 UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5
 AdvancedPM=no WriteCache=enabled
 Drive conforms to: device does not report version:

 * signifies the current active mode


my kernel: 2.6.0-test11
my chipset: sis-735

looking at your test results I believe hdparm is reading to few data to make
the benchmark

	Ulisses

> 
> The disks are setup with hdparm at boot time:
> 
> /sbin/hdparm -X69 -d1 -u1 -m16 -c3 /dev/hda
> /sbin/hdparm -X69 -d1 -u1 -m16 -c3 /dev/hdc
> 
> When running hdparm -tT I get the following:
> 
> /dev/hda:
>  Timing buffer-cache reads:   128 MB in  1.13 seconds =113.27 MB/sec
>  Timing buffered disk reads:  64 MB in  2.46 seconds = 26.02 MB/sec
> 
> /dev/hdc:
>  Timing buffer-cache reads:   128 MB in  1.13 seconds =113.27 MB/sec
>  Timing buffered disk reads:  64 MB in  2.47 seconds = 25.91 MB/sec
> 
> Are these normal values? I don't think so. Please advise.
> 
> /Nicke
> 
> -
> To unsubscribe from this list: send the line "unsubscribe linux-ide" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

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Re: IDE-RAID Drive Performance

[Willy Gardiol]

Check you are using 80pin cables... but -X69 would fail if not.
PCI bus should not be to blame for this, unless your is overloaded (?) like 
heavy network traffic (fast or gigabit ethernet) may steal PCI cycles, but i 
have never seen this happen in pc's... 

Maybe check your card is not sharing an IRQ, move into another slot, try 
some fixed allocation from BIOS to avoid this...
But i whouldnt expect too much from this on the speed side (just in case 
some troubles with IRQ sharing). 

Are you using the new pdc driver? The new one is the one supporting newer 
chipsets like the 20271, i do not know which chip your promise has. 

Try Bonnie to get some real on-the-road measurement from ypur filesystems... 
that is the REAL speed you can get from your disks. 


Nicklas Bondesson Scrive: 

> Ok, so you currently don't have any suggestions on this? Could it be a slow
> PCI slot causing the poor performance? It's an ASUS P2B (rev 1.04)
> motherboard with PCI 2.1 enabled in BIOS. 
> 
> /Nicke  
> 
> -----Original Message-----
> From: Willy Gardiol [mailto:willy@gardiol.org] 
> Sent: den 30 december 2003 11:58
> To: Nicklas Bondesson
> Cc: linux-ide@vger.kernel.org
> Subject: Re: IDE-RAID Drive Performance 
> 
> 
> Every experience i had with Promise controllers AND linux 2.4.xx where xx is
>> 17 has given me troubles both on x86 and sparc architecture with DMA
> enabled.  
> 
> But i do not have enough time to troubleshoot this and i never got much
> attention here probably because i do not have any ooops or more specific
> data to report!  
> 
> Besides that, my maxtor 40gb (dont remember model right now) does about
> 40mb/sec instead of yours 25.  
> 
> Nicklas Bondesson Scrive:  
> 
>> Hi!  
>> 
>> I think i'm getting really bad values from my disks. It's two Western 
>> Digital WD800JB-00DUA3 (Special Edition 8 MB cache) disks connected to 
>> a Promise TX2000 (PDC20271) card (RAID1 using ataraid). 
>> 
>> The disks are setup with hdparm at boot time:  
>> 
>> /sbin/hdparm -X69 -d1 -u1 -m16 -c3 /dev/hda /sbin/hdparm -X69 -d1 -u1 
>> -m16 -c3 /dev/hdc 
>> 
>> When running hdparm -tT I get the following:  
>> 
>> /dev/hda:
>>  Timing buffer-cache reads:   128 MB in  1.13 seconds =113.27 MB/sec
>>  Timing buffered disk reads:  64 MB in  2.46 seconds = 26.02 MB/sec 
>> 
>> /dev/hdc:
>>  Timing buffer-cache reads:   128 MB in  1.13 seconds =113.27 MB/sec
>>  Timing buffered disk reads:  64 MB in  2.47 seconds = 25.91 MB/sec 
>> 
>> Are these normal values? I don't think so. Please advise.  
>> 
>> /Nicke 
>> 
>> -
>> To unsubscribe from this list: send the line "unsubscribe linux-ide" 
>> in the body of a message to majordomo@vger.kernel.org More majordomo 
>> info at  http://vger.kernel.org/majordomo-info.html
>   
> 
 

RE: IDE-RAID Drive Performance

[Nicklas Bondesson]

This is what I get using bonnie:

Is this correct 46.48 MB / sec ?

gollum:~# bonnie -s 800 -u root
Using uid:0, gid:0.
Writing with putc()...done
Writing intelligently...done
Rewriting...done
Reading with getc()...done
Reading intelligently...done
start 'em...done...done...done...
Create files in sequential order...done.
Stat files in sequential order...done.
Delete files in sequential order...done.
Create files in random order...done.
Stat files in random order...done.
Delete files in random order...done.
Version 1.02b       ------Sequential Output------ --Sequential Input-
--Random-
                    -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
--Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec
%CP
gollum         800M  4648  98 19443  37  8422  14  4859  94 24766  17 282.8
2
                    ------Sequential Create------ --------Random
Create--------
                    -Create-- --Read--- -Delete-- -Create-- --Read---
-Delete--
              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec
%CP
                 16   306  99 +++++ +++ 20985  99   319  99 +++++ +++  1683
97
gollum,800M,4648,98,19443,37,8422,14,4859,94,24766,17,282.8,2,16,306,99,++++
+,++
+,20985,99,319,99,+++++,+++,1683,97 

-----Original Message-----
From: linux-ide-owner@vger.kernel.org
[mailto:linux-ide-owner@vger.kernel.org] On Behalf Of Willy Gardiol
Sent: den 30 december 2003 12:12
To: Nicklas Bondesson
Cc: linux-ide@vger.kernel.org
Subject: Re: IDE-RAID Drive Performance


Check you are using 80pin cables... but -X69 would fail if not.
PCI bus should not be to blame for this, unless your is overloaded (?) like
heavy network traffic (fast or gigabit ethernet) may steal PCI cycles, but i
have never seen this happen in pc's... 

Maybe check your card is not sharing an IRQ, move into another slot, try
some fixed allocation from BIOS to avoid this...
But i whouldnt expect too much from this on the speed side (just in case
some troubles with IRQ sharing). 

Are you using the new pdc driver? The new one is the one supporting newer
chipsets like the 20271, i do not know which chip your promise has. 

Try Bonnie to get some real on-the-road measurement from ypur filesystems...

that is the REAL speed you can get from your disks. 


Nicklas Bondesson Scrive: 

> Ok, so you currently don't have any suggestions on this? Could it be a 
> slow PCI slot causing the poor performance? It's an ASUS P2B (rev 
> 1.04) motherboard with PCI 2.1 enabled in BIOS.
> 
> /Nicke
> 
> -----Original Message-----
> From: Willy Gardiol [mailto:willy@gardiol.org]
> Sent: den 30 december 2003 11:58
> To: Nicklas Bondesson
> Cc: linux-ide@vger.kernel.org
> Subject: Re: IDE-RAID Drive Performance
> 
> 
> Every experience i had with Promise controllers AND linux 2.4.xx where 
> xx is
>> 17 has given me troubles both on x86 and sparc architecture with DMA
> enabled.  
> 
> But i do not have enough time to troubleshoot this and i never got 
> much attention here probably because i do not have any ooops or more 
> specific data to report!
> 
> Besides that, my maxtor 40gb (dont remember model right now) does 
> about 40mb/sec instead of yours 25.
> 
> Nicklas Bondesson Scrive:  
> 
>> Hi!  
>> 
>> I think i'm getting really bad values from my disks. It's two Western 
>> Digital WD800JB-00DUA3 (Special Edition 8 MB cache) disks connected 
>> to a Promise TX2000 (PDC20271) card (RAID1 using ataraid).
>> 
>> The disks are setup with hdparm at boot time:  
>> 
>> /sbin/hdparm -X69 -d1 -u1 -m16 -c3 /dev/hda /sbin/hdparm -X69 -d1 -u1
>> -m16 -c3 /dev/hdc
>> 
>> When running hdparm -tT I get the following:  
>> 
>> /dev/hda:
>>  Timing buffer-cache reads:   128 MB in  1.13 seconds =113.27 MB/sec
>>  Timing buffered disk reads:  64 MB in  2.46 seconds = 26.02 MB/sec
>> 
>> /dev/hdc:
>>  Timing buffer-cache reads:   128 MB in  1.13 seconds =113.27 MB/sec
>>  Timing buffered disk reads:  64 MB in  2.47 seconds = 25.91 MB/sec
>> 
>> Are these normal values? I don't think so. Please advise.  
>> 
>> /Nicke
>> 
>> -
>> To unsubscribe from this list: send the line "unsubscribe linux-ide" 
>> in the body of a message to majordomo@vger.kernel.org More majordomo 
>> info at  http://vger.kernel.org/majordomo-info.html
>   
> 
 
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To unsubscribe from this list: send the line "unsubscribe linux-ide" in the
body of a message to majordomo@vger.kernel.org More majordomo info at
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IDE-RAID Drive Performance

[Nicklas Bondesson]

Hi!

I think i'm getting really bad values from my disks. It's two Western
Digital WD800JB-00DUA3 (Special Edition 8 MB cache) disks connected to a
Promise TX2000 (PDC20271) card (RAID1 using ataraid).

The disks are setup with hdparm at boot time:

/sbin/hdparm -X69 -d1 -u1 -m16 -c3 /dev/hda
/sbin/hdparm -X69 -d1 -u1 -m16 -c3 /dev/hdc

When running hdparm -tT I get the following:

/dev/hda:
 Timing buffer-cache reads:   128 MB in  1.13 seconds =113.27 MB/sec
 Timing buffered disk reads:  64 MB in  2.46 seconds = 26.02 MB/sec

/dev/hdc:
 Timing buffer-cache reads:   128 MB in  1.13 seconds =113.27 MB/sec
 Timing buffered disk reads:  64 MB in  2.47 seconds = 25.91 MB/sec

Are these normal values? I don't think so. Please advise.

/Nicke

Re: IDE-RAID Drive Performance

[Willy Gardiol]

Every experience i had with Promise controllers AND linux 2.4.xx
where xx is > 17 has given me troubles both on x86 and sparc architecture 
with DMA enabled. 

But i do not have enough time to troubleshoot this and i never got much 
attention here probably because i do not have any ooops or more specific 
data to report! 

Besides that, my maxtor 40gb (dont remember model right now) does about 
40mb/sec instead of yours 25. 

Nicklas Bondesson Scrive: 

> Hi! 
> 
> I think i'm getting really bad values from my disks. It's two Western
> Digital WD800JB-00DUA3 (Special Edition 8 MB cache) disks connected to a
> Promise TX2000 (PDC20271) card (RAID1 using ataraid). 
> 
> The disks are setup with hdparm at boot time: 
> 
> /sbin/hdparm -X69 -d1 -u1 -m16 -c3 /dev/hda
> /sbin/hdparm -X69 -d1 -u1 -m16 -c3 /dev/hdc 
> 
> When running hdparm -tT I get the following: 
> 
> /dev/hda:
>  Timing buffer-cache reads:   128 MB in  1.13 seconds =113.27 MB/sec
>  Timing buffered disk reads:  64 MB in  2.46 seconds = 26.02 MB/sec 
> 
> /dev/hdc:
>  Timing buffer-cache reads:   128 MB in  1.13 seconds =113.27 MB/sec
>  Timing buffered disk reads:  64 MB in  2.47 seconds = 25.91 MB/sec 
> 
> Are these normal values? I don't think so. Please advise. 
> 
> /Nicke 
> 
> -
> To unsubscribe from this list: send the line "unsubscribe linux-ide" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
 

RE: IDE-RAID Drive Performance

[Nicklas Bondesson]

Ok, so you currently don't have any suggestions on this? Could it be a slow
PCI slot causing the poor performance? It's an ASUS P2B (rev 1.04)
motherboard with PCI 2.1 enabled in BIOS.

/Nicke 

-----Original Message-----
From: Willy Gardiol [mailto:willy@gardiol.org] 
Sent: den 30 december 2003 11:58
To: Nicklas Bondesson
Cc: linux-ide@vger.kernel.org
Subject: Re: IDE-RAID Drive Performance


Every experience i had with Promise controllers AND linux 2.4.xx where xx is
> 17 has given me troubles both on x86 and sparc architecture with DMA
enabled. 

But i do not have enough time to troubleshoot this and i never got much
attention here probably because i do not have any ooops or more specific
data to report! 

Besides that, my maxtor 40gb (dont remember model right now) does about
40mb/sec instead of yours 25. 

Nicklas Bondesson Scrive: 

> Hi! 
> 
> I think i'm getting really bad values from my disks. It's two Western 
> Digital WD800JB-00DUA3 (Special Edition 8 MB cache) disks connected to 
> a Promise TX2000 (PDC20271) card (RAID1 using ataraid).
> 
> The disks are setup with hdparm at boot time: 
> 
> /sbin/hdparm -X69 -d1 -u1 -m16 -c3 /dev/hda /sbin/hdparm -X69 -d1 -u1 
> -m16 -c3 /dev/hdc
> 
> When running hdparm -tT I get the following: 
> 
> /dev/hda:
>  Timing buffer-cache reads:   128 MB in  1.13 seconds =113.27 MB/sec
>  Timing buffered disk reads:  64 MB in  2.46 seconds = 26.02 MB/sec
> 
> /dev/hdc:
>  Timing buffer-cache reads:   128 MB in  1.13 seconds =113.27 MB/sec
>  Timing buffered disk reads:  64 MB in  2.47 seconds = 25.91 MB/sec
> 
> Are these normal values? I don't think so. Please advise. 
> 
> /Nicke
> 
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