Poor SCSI drive performance on SMP machine, 2.2.16

Poor SCSI drive performance on SMP machine, 2.2.16

[paradox3]

[-- Attachment #1: Type: text/plain, Size: 716 bytes --]

I have an SMP machine (dual PII 400s) running 2.2.16 with one 10,000 RPM IBM
10 GB SCSI drive
(AIC 7890 on motherboard, using aic7xxx.o), and four various IDE drives. The
SCSI drive
performs the worst. In tests of writing 100 MB and sync'ing, one of my IDE
drives takes 31 seconds. The SCSI drive (while doing nothing else) took
2 minutes, 10 seconds. This is extremely noticable in file transfers that
completely
monopolize the SCSI drive, and are much slower than when involving the IDE
drives.
After a large data operation on the SCSI drive, the system will hang for
several minutes.
Anyone know what could be causing this? Thanks.

Attached are some data to help.


Thanks,
    Para-dox (paradox3@maine.rr.com)


[-- Attachment #2: interrupts.txt --]
[-- Type: text/plain, Size: 578 bytes --]

           CPU0       CPU1       
  0:   43661720   59171710    IO-APIC-edge  timer
  1:     233992     282694    IO-APIC-edge  keyboard
  2:          0          0          XT-PIC  cascade
  8:          1          0    IO-APIC-edge  rtc
 13:          1          0          XT-PIC  fpu
 14:         20         10    IO-APIC-edge  ide0
 15:   46455293   50354306    IO-APIC-edge  ide1
 16:   14508949   14462778   IO-APIC-level  eth0
 17:    3939554    4293901   IO-APIC-level  eth1
 18:     750747     761816   IO-APIC-level  aic7xxx
NMI:          0
ERR:          0

[-- Attachment #3: pci.txt --]
[-- Type: text/plain, Size: 2197 bytes --]

PCI devices found:
  Bus  0, device   0, function  0:
    Host bridge: Intel 440BX - 82443BX Host (rev 2).
      Medium devsel.  Master Capable.  Latency=64.  
      Prefetchable 32 bit memory at 0xe8000000 [0xe8000008].
  Bus  0, device   1, function  0:
    PCI bridge: Intel 440BX - 82443BX AGP (rev 2).
      Medium devsel.  Master Capable.  Latency=64.  Min Gnt=136.
  Bus  0, device   7, function  0:
    ISA bridge: Intel 82371AB PIIX4 ISA (rev 2).
      Medium devsel.  Fast back-to-back capable.  Master Capable.  No bursts.  
  Bus  0, device   7, function  1:
    IDE interface: Intel 82371AB PIIX4 IDE (rev 1).
      Medium devsel.  Fast back-to-back capable.  Master Capable.  Latency=64.  
      I/O at 0xf000 [0xf001].
  Bus  0, device   7, function  2:
    USB Controller: Intel 82371AB PIIX4 USB (rev 1).
      Medium devsel.  Fast back-to-back capable.  IRQ 10.  Master Capable.  Latency=64.  
      I/O at 0xe000 [0xe001].
  Bus  0, device   7, function  3:
    Bridge: Intel 82371AB PIIX4 ACPI (rev 2).
      Medium devsel.  Fast back-to-back capable.  
  Bus  0, device   8, function  0:
    Ethernet controller: Intel 82557 (rev 5).
      Medium devsel.  Fast back-to-back capable.  IRQ 16.  Master Capable.  Latency=64.  Min Gnt=8.Max Lat=56.
      Prefetchable 32 bit memory at 0xef101000 [0xef101008].
      I/O at 0xe400 [0xe401].
      Non-prefetchable 32 bit memory at 0xef000000 [0xef000000].
  Bus  0, device   9, function  0:
    Ethernet controller: Winbond NE2000-PCI (rev 0).
      Medium devsel.  Fast back-to-back capable.  IRQ 17.  
      I/O at 0xe800 [0xe801].
  Bus  0, device  12, function  0:
    SCSI storage controller: Adaptec AIC-7890/1 (rev 0).
      Medium devsel.  Fast back-to-back capable.  BIST capable.  IRQ 18.  Master Capable.  Latency=64.  Min Gnt=39.Max Lat=25.
      I/O at 0xec00 [0xec01].
      Non-prefetchable 64 bit memory at 0xef100000 [0xef100004].
  Bus  1, device   0, function  0:
    VGA compatible controller: S3 Inc. ViRGE/GX2 (rev 6).
      Medium devsel.  IRQ 16.  Master Capable.  Latency=64.  Min Gnt=4.Max Lat=255.
      Non-prefetchable 32 bit memory at 0xe0000000 [0xe0000000].

Re: Poor SCSI drive performance on SMP machine, 2.2.16

[Andre Hedrick]

WOOHOO, first report where I win one against the ever losing battle
against SCSI....paradox3, you made my evening...

Also please add to the sign on I95 exit 2...

""Welcome to Maine", 'now you can go home, now'"

Caution Moose will attempt to mate with cars carrying canoes in the winter.

Cheers,

Andre Hedrick
Linux ATA Development
 
On Sun, 28 Jan 2001, paradox3 wrote:

> I have an SMP machine (dual PII 400s) running 2.2.16 with one 10,000 RPM IBM
> 10 GB SCSI drive
> (AIC 7890 on motherboard, using aic7xxx.o), and four various IDE drives. The
> SCSI drive
> performs the worst. In tests of writing 100 MB and sync'ing, one of my IDE
> drives takes 31 seconds. The SCSI drive (while doing nothing else) took
> 2 minutes, 10 seconds. This is extremely noticable in file transfers that
> completely
> monopolize the SCSI drive, and are much slower than when involving the IDE
> drives.
> After a large data operation on the SCSI drive, the system will hang for
> several minutes.
> Anyone know what could be causing this? Thanks.
> 
> Attached are some data to help.
> 
> 
> Thanks,
>     Para-dox (paradox3@maine.rr.com)
> 
> 

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Re: Poor SCSI drive performance on SMP machine, 2.2.16

[Bruce Harada]

Hi.

Do you get messages like the ones below in /var/log/messages?

  sym53c875-0-<0,0>: QUEUE FULL! 8 busy, 7 disconnected CCBs
  sym53c875-0-<0,0>: tagged command queue depth set to 7

In fact, do you get any messages in your log files that look like they
might be related?

--
Bruce Harada
bruce@ask.ne.jp


On Sun, 28 Jan 2001 02:26:32 -0500
"paradox3" <paradox3@maine.rr.com> wrote:

> I have an SMP machine (dual PII 400s) running 2.2.16 with one 10,000 RPM
> IBM
> 10 GB SCSI drive
> (AIC 7890 on motherboard, using aic7xxx.o), and four various IDE drives.
> The
> SCSI drive
> performs the worst. In tests of writing 100 MB and sync'ing, one of my
> IDE
> drives takes 31 seconds. The SCSI drive (while doing nothing else) took
> 2 minutes, 10 seconds. This is extremely noticable in file transfers
> that
> completely
> monopolize the SCSI drive, and are much slower than when involving the
> IDE
> drives.
> After a large data operation on the SCSI drive, the system will hang for
> several minutes.
> Anyone know what could be causing this? Thanks.
> 
> Attached are some data to help.
> 
> 
> Thanks,
>     Para-dox (paradox3@maine.rr.com)
> 
> 
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Re: Poor SCSI drive performance on SMP machine, 2.2.16

[Gérard Roudier]

On Sun, 28 Jan 2001, paradox3 wrote:

> I have an SMP machine (dual PII 400s) running 2.2.16 with one 10,000 RPM IBM
> 10 GB SCSI drive
> (AIC 7890 on motherboard, using aic7xxx.o), and four various IDE drives. The
> SCSI drive
> performs the worst. In tests of writing 100 MB and sync'ing, one of my IDE
> drives takes 31 seconds. The SCSI drive (while doing nothing else) took
> 2 minutes, 10 seconds. This is extremely noticable in file transfers that
> completely
> monopolize the SCSI drive, and are much slower than when involving the IDE
> drives.
> After a large data operation on the SCSI drive, the system will hang for
> several minutes.
> Anyone know what could be causing this? Thanks.
> 
> Attached are some data to help.

You didn't provide enough information for anybody to have a single idea
about the cause of the problem you report, in my opinion.

Just any not too old 10,000 RPM disk is able to sustain more that 25 MB/s
sequential data transfer, but cannot do better than 5 milli-seconds
latency with random IO patterns. So, result for 100 MB transfer can be
less than 4 seconds in the best case but greater than (25000*5)/1000=125
seconds for random 4K IO pattern, for example.

What you want to do, in my opinion, could be:

- Check in the syslog the actual transfer speed that has been negotiated
  for your SCSI disk.
- Also check if error messages related to disk IOs have been reported by 
  the kernel.
- Run some benchmark to check, at least, sequential IO performance (iozone
  for example will fit)

Gérard.

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Re: Poor SCSI drive performance on SMP machine, 2.2.16

[paradox3]

I don't get any messages relating to the drives in any syslog output.



----- Original Message -----
From: "Bruce Harada" <bruce@ask.ne.jp>
To: "paradox3" <paradox3@maine.rr.com>
Cc: <linux-kernel@vger.kernel.org>; <linux-smp@vger.kernel.org>
Sent: Sunday, January 28, 2001 3:40 AM
Subject: Re: Poor SCSI drive performance on SMP machine, 2.2.16


>
> Hi.
>
> Do you get messages like the ones below in /var/log/messages?
>
>   sym53c875-0-<0,0>: QUEUE FULL! 8 busy, 7 disconnected CCBs
>   sym53c875-0-<0,0>: tagged command queue depth set to 7
>
> In fact, do you get any messages in your log files that look like they
> might be related?
>
> --
> Bruce Harada
> bruce@ask.ne.jp
>
>
> On Sun, 28 Jan 2001 02:26:32 -0500
> "paradox3" <paradox3@maine.rr.com> wrote:
>
> > I have an SMP machine (dual PII 400s) running 2.2.16 with one 10,000 RPM
> > IBM
> > 10 GB SCSI drive
> > (AIC 7890 on motherboard, using aic7xxx.o), and four various IDE drives.
> > The
> > SCSI drive
> > performs the worst. In tests of writing 100 MB and sync'ing, one of my
> > IDE
> > drives takes 31 seconds. The SCSI drive (while doing nothing else) took
> > 2 minutes, 10 seconds. This is extremely noticable in file transfers
> > that
> > completely
> > monopolize the SCSI drive, and are much slower than when involving the
> > IDE
> > drives.
> > After a large data operation on the SCSI drive, the system will hang for
> > several minutes.
> > Anyone know what could be causing this? Thanks.
> >
> > Attached are some data to help.
> >
> >
> > Thanks,
> >     Para-dox (paradox3@maine.rr.com)
> >
> >
>

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Re: Poor SCSI drive performance on SMP machine, 2.2.16

[Bruce Harada]

Hm. As a point of comparison, I use a similar system to yours (full SCSI,
though, no IDE) and I can copy a 100MB file from disk-to-disk, or on the
same disk, in around 13 seconds. Where are you copying to the SCSI drive
from - the same drive, an IDE disk, CDROM? If IDE, what are its
particulars? (Check with hdparm -iI /dev/hd?)

--
Bruce Harada
bruce@ask.ne.jp



On Sun, 28 Jan 2001 12:44:29 -0500
"paradox3" <paradox3@maine.rr.com> wrote:
>
> I don't get any messages relating to the drives in any syslog output.
> 
> >
> > Do you get messages like the ones below in /var/log/messages?
> >
> >   sym53c875-0-<0,0>: QUEUE FULL! 8 busy, 7 disconnected CCBs
> >   sym53c875-0-<0,0>: tagged command queue depth set to 7
> >
> > In fact, do you get any messages in your log files that look like they
> > might be related?
> >
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Re: Poor SCSI drive performance on SMP machine, 2.2.16

[paradox3]

I did this:

date
dd if=/dev/zero of=TESTFILE bs=1024 count=102400
date
sync
date


and I gave the time differences from the first to the last timestamp.

Regards, Para-dox (paradox3@maine.rr.com)



----- Original Message -----
From: "Bruce Harada" <bruce@ask.ne.jp>
To: "paradox3" <paradox3@maine.rr.com>
Cc: <linux-kernel@vger.kernel.org>
Sent: Sunday, January 28, 2001 2:31 PM
Subject: Re: Poor SCSI drive performance on SMP machine, 2.2.16


>
> Hm. As a point of comparison, I use a similar system to yours (full SCSI,
> though, no IDE) and I can copy a 100MB file from disk-to-disk, or on the
> same disk, in around 13 seconds. Where are you copying to the SCSI drive
> from - the same drive, an IDE disk, CDROM? If IDE, what are its
> particulars? (Check with hdparm -iI /dev/hd?)
>
> --
> Bruce Harada
> bruce@ask.ne.jp
>
>
>
> On Sun, 28 Jan 2001 12:44:29 -0500
> "paradox3" <paradox3@maine.rr.com> wrote:
> >
> > I don't get any messages relating to the drives in any syslog output.
> >
> > >
> > > Do you get messages like the ones below in /var/log/messages?
> > >
> > >   sym53c875-0-<0,0>: QUEUE FULL! 8 busy, 7 disconnected CCBs
> > >   sym53c875-0-<0,0>: tagged command queue depth set to 7
> > >
> > > In fact, do you get any messages in your log files that look like they
> > > might be related?
> > >
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> Please read the FAQ at http://www.tux.org/lkml/
>

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Re: Poor SCSI drive performance on SMP machine, 2.2.16

[paradox3]

[-- Attachment #1: Type: text/plain, Size: 55 bytes --]

Sorry, forget this last email. Here is hdparm output.


[-- Attachment #2: hdparm --]
[-- Type: application/octet-stream, Size: 1035 bytes --]


/dev/hdd:

 Model=IBM-DTLA-307030, FwRev=TX4OA50C, SerialNo=YKDYKT8D495
 Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
 RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=40
 BuffType=DualPortCache, BuffSize=1916kB, MaxMultSect=16, MultSect=off
 CurCHS=16383/16/63, CurSects=-66060037, LBA=yes, LBAsects=60036480
 IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes: pio0 pio1 pio2 pio3 pio4 
 DMA modes: mdma0 mdma1 mdma2 udma0 udma1 *udma2 udma3 udma4 udma5 

 Model=BI-MTDAL3-7030 0                        , FwRev=XTO45AC0, SerialNo=        Y DKKY8T4D59
 Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
 RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=40
 BuffType=DualPortCache, BuffSize=1916kB, MaxMultSect=16, MultSect=off
 CurCHS=16383/16/63, CurSects=-66060037, LBA=yes, LBAsects=60036480
 IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes: pio0 pio1 pio2 pio3 pio4 
 DMA modes: mdma0 mdma1 mdma2 udma0 udma1 *udma2 udma3 udma4 udma5 

Re: Poor SCSI drive performance on SMP machine, 2.2.16

[paradox3]

> It sounds to me like you have a SCSI bus problem. Have you checked
> termination? Cable quality? Cable lengths?

Forgive me, I'm rather ignorant of SCSI hardware.....All that I have is a
cable (appears
to be good quality, came with motherboard) about 60 centimeters long going
from the
motherboard to my hard drive. There is an unused/empty port in between.

>
> Do you have tagged queuing enabled for aic7xxx? It's a config option
> and you can adjust the maximum queue depth. You can see the current
> settings by cat /proc/scsi/aic7xxx/0
>
/proc/scsi only contains a single file named "scsi" with brief info about
the drive
According to my last save kernel config, tagged command queueing is not
enabled by default.
Could this be the problem?


> Do you have write caching enabled on the drive? scsiinfo -c /dev/sdx
> will tell you if you do.
I don't seem to have scsiinfo.

>
> As a data point, I copied a 650MB file to another file on the same
> 10krpm disk and sync'ed in about the same time it takes you to write
> 100MB. I've also copied it from a slower 7200rpm disk to my 10krpm IBM
> drive and sync'ed in 1 min 19 secs which is about the read speed of
> the slower disk.
>
> --
> Trevor Hemsley, Brighton, UK.
> Trevor-Hemsley@dial.pipex.com
>

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Re: Poor SCSI drive performance on SMP machine, 2.2.16

[Johan Kullstam]

"paradox3" <paradox3@maine.rr.com> writes:

> I did this:
> 
> date
> dd if=/dev/zero of=TESTFILE bs=1024 count=102400
> date
> sync
> date
> 
> 
> and I gave the time differences from the first to the last
> timestamp.

hmm.  i ran this on my old ppro200 with adaptec 2940uw and ibm
DDRS-39130W drive.

sophia(jk)$ cat foo 
date
dd if=/dev/zero of=TESTFILE bs=1024 count=102400
date
sync
sync
sync
date

i get

sophia(jk)$ time bash foo
Sun Jan 28 18:41:52 EST 2001
102400+0 records in
102400+0 records out
Sun Jan 28 18:42:11 EST 2001
Sun Jan 28 18:42:13 EST 2001

real    0m20.803s
user    0m0.400s
sys     0m8.780s

and this during a full kernel compile.

i get similar decent results using my other computer with a symbios
8751sp and fujitsu and seagate drives.

something must be messed up in a configuration somewhere.  are you
sure you are running the drive in synchronous ultra wide mode?  is you
termination good?

> Regards, Para-dox (paradox3@maine.rr.com)
> 
> 
> 
> ----- Original Message -----
> From: "Bruce Harada" <bruce@ask.ne.jp>
> To: "paradox3" <paradox3@maine.rr.com>
> Cc: <linux-kernel@vger.kernel.org>
> Sent: Sunday, January 28, 2001 2:31 PM
> Subject: Re: Poor SCSI drive performance on SMP machine, 2.2.16
> 
> 
> >
> > Hm. As a point of comparison, I use a similar system to yours (full SCSI,
> > though, no IDE) and I can copy a 100MB file from disk-to-disk, or on the
> > same disk, in around 13 seconds. Where are you copying to the SCSI drive
> > from - the same drive, an IDE disk, CDROM? If IDE, what are its
> > particulars? (Check with hdparm -iI /dev/hd?)
> >
> > --
> > Bruce Harada
> > bruce@ask.ne.jp
> >
> >
> >
> > On Sun, 28 Jan 2001 12:44:29 -0500
> > "paradox3" <paradox3@maine.rr.com> wrote:
> > >
> > > I don't get any messages relating to the drives in any syslog output.
> > >
> > > >
> > > > Do you get messages like the ones below in /var/log/messages?
> > > >
> > > >   sym53c875-0-<0,0>: QUEUE FULL! 8 busy, 7 disconnected CCBs
> > > >   sym53c875-0-<0,0>: tagged command queue depth set to 7
> > > >
> > > > In fact, do you get any messages in your log files that look like they
> > > > might be related?
> > > >
> > -
> > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> > the body of a message to majordomo@vger.kernel.org
> > Please read the FAQ at http://www.tux.org/lkml/
> >
> 
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
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-- 
J o h a n  K u l l s t a m
[kullstam@ne.mediaone.net]
Don't Fear the Penguin!
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Re: Poor SCSI drive performance on SMP machine, 2.2.16

[paradox3]

[-- Attachment #1: Type: text/plain, Size: 916 bytes --]

Here is the output from dmesg. How do I tell if it is improperly terminated?

Thanks, Para-dox (paradox3@maine.rr.com)




----- Original Message -----
From: "Michael Brown" <flight666@hotmail.com>
To: <paradox3@maine.rr.com>
Sent: Sunday, January 28, 2001 11:12 PM
Subject: Re: Poor SCSI drive performance on SMP machine, 2.2.16


> Your problem appears to be improper SCSI termination.
>
> You need to either
>   1) make sure your SCSI drive has termination enabled
> or
>   2) move your SCSI drive to the middle connector and put a terminator on
> the last connector
>
> Check your syslog and post to l-k the part where it detects your drives.
> I'll bet the adapter is throttling back quite dramatically in the presence
> of improper termination.
>
> --
> Michael Brown
>
> _________________________________________________________________
> Get your FREE download of MSN Explorer at http://explorer.msn.com
>
>

[-- Attachment #2: dmesg.txt --]
[-- Type: text/plain, Size: 725 bytes --]

(scsi0) <Adaptec AIC-7890/1 Ultra2 SCSI host adapter> found at PCI 0/12/0
(scsi0) Wide Channel, SCSI ID=7, 32/255 SCBs
(scsi0) Downloading sequencer code... 392 instructions downloaded
scsi0 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 5.1.31/3.2.4
       <Adaptec AIC-7890/1 Ultra2 SCSI host adapter>
scsi : 1 host.
(scsi0:0:0:0) Synchronous at 40.0 Mbyte/sec, offset 15.
  Vendor: IBM       Model: DGHS09U           Rev: 0350
  Type:   Direct-Access                      ANSI SCSI revision: 03
Detected scsi disk sda at scsi0, channel 0, id 0, lun 0
scsi : detected 1 SCSI disk total.
SCSI device sda: hdwr sector= 512 bytes. Sectors= 17916240 [8748 MB] [8.7 GB]
Partition check:
 sda: sda1 sda2 sda3

Re: Poor SCSI drive performance on SMP machine, 2.2.16

[Johan Kullstam]

"paradox3" <paradox3@maine.rr.com> writes:

> Here is the output from dmesg. How do I tell if it is improperly
> terminated?

you never gave the model of the hard drive (or if you did, i didn't
see it), but you did say a 10k rpm ibm.  i am going to assume it is
u2w/lvd capable.  no lvd hard drive has termination built in.  you
must use a seperate termination device at the end of the ribbon.  or
you can use a terminating cable.  since your controller is a
single-ended device, get a single-ended, wide, active terminator and
plug it into the end of the ribbon.  put the hard drive in the middle
somewhere.

see <URL:http://www.scsifaq.org/> for more information.

> Thanks, Para-dox (paradox3@maine.rr.com)
> 
> 
> 
> 
> ----- Original Message -----
> From: "Michael Brown" <flight666@hotmail.com>
> To: <paradox3@maine.rr.com>
> Sent: Sunday, January 28, 2001 11:12 PM
> Subject: Re: Poor SCSI drive performance on SMP machine, 2.2.16
> 
> 
> > Your problem appears to be improper SCSI termination.
> >
> > You need to either
> >   1) make sure your SCSI drive has termination enabled
> > or
> >   2) move your SCSI drive to the middle connector and put a terminator on
> > the last connector
> >
> > Check your syslog and post to l-k the part where it detects your drives.
> > I'll bet the adapter is throttling back quite dramatically in the presence
> > of improper termination.
> >
> > --
> > Michael Brown
> >
> > _________________________________________________________________
> > Get your FREE download of MSN Explorer at http://explorer.msn.com
> >
> >
> 

-- 
J o h a n  K u l l s t a m
[kullstam@ne.mediaone.net]
Don't Fear the Penguin!
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