[CentOS] 3Ware 9550SX-4LP Performance

Sun Oct 1 22:37:33 UTC 2006
Johnny Hughes <mailing-lists at hughesjr.com>

On Sun, 2006-10-01 at 08:09 -0700, Kirk Bocek wrote:
> 
> Francois Caen wrote:
> > On 9/30/06, Kirk Bocek <t004 at kbocek.com> wrote:
> >> Whoa! Block writes jumped to 130MB/Sec with no other changes. XFS Rocks!
> > 
> > Too bad it's not supported and QA'd by the upstream vendor and
> > therefore shouldn't be used in production on CentOS :-(
> > 
> 
> Well hey! I think the downstream vendor rocks too! And it sounds like 
> centosplus has done some defacto QA too. :)
> 
> Doing some further benchmarking, I added 'blockdev --setra 32768 /dev/sdb' to 
> my previous setup and ran a bunch of benchmarks overnight. The results:
> 
>                   ------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
> Beryl   50G:256k 58911  93 198971  36 57194   8 47548  73 166183  14  62.2   2
> Beryl   50G:256k 60773  94 196980  36 56325   8 47719  74 166580  14  61.8   2
> Beryl   50G:256k 59977  94 187017  36 55981   8 47975  74 165562  14  64.0   2
> Beryl   50G:256k 60193  94 196472  36 56896   8 47913  74 166449  14  63.0   2
> Beryl   50G:256k 59802  94 201524  38 56746   8 48084  75 168710  14  64.7   1
> Beryl   50G:256k 60677  94 199188  37 52997   7 47682  74 163131  15  64.0   2
> Beryl   50G:256k 60061  94 191342  37 55949   9 47794  74 165348  15  64.3   2
> Beryl   50G:256k 60261  94 184231  35 56235   8 48090  74 166860  14  61.8   2
>                   ------Sequential Create------ --------Random Create--------
>                   -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
> files:max:min     /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
> Beryl         16  3597  17 +++++ +++  4088  18  3101  15 +++++ +++   856   4
> Beryl         16  3240  16 +++++ +++  4561  20  3030  15 +++++ +++   755   3
> Beryl         16  3039  14 +++++ +++  4446  20  3111  15 +++++ +++   754   3
> Beryl         16  3317  16 +++++ +++  4509  21  2978  15 +++++ +++   767   3
> Beryl         16  5037  25 +++++ +++  4801  20  3349  17 +++++ +++   891   4
> Beryl         16  3390  16 +++++ +++  3341  14  3222  17 +++++ +++   806   3
> Beryl         16  3547  17 +++++ +++  3700  16  2986  15 +++++ +++   799   4
> Beryl         16  3556  18 +++++ +++  3183  13  3391  17 +++++ +++   863   4
> 
> Block writes are still close to 200MB/Sec but block reads still haven't 
> changed from 166MB/Sec. :(
> 
> Anyone have any thoughts on increasing read speed other than using blockdev?
> 

If you are using XFS ... make sure to use the standalone modules and not
the versions with XFS compiled into the kernel.

The standalone modules are much newer code from SGI.

I would also recommend using the x86_64 arch if it can be used as the
x86_64 kernel is more stable w/XFS due to the 4K stacks issue that
sometimes causes problems with the i386 arch.
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