Re: IDE-RAID Drive Performance

[Willy Gardiol <willy@gardiol.org>]

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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?)
>
>
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- -- 

! 
 Willy Gardiol - willy@gardiol.org
 www.gardiol.org
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