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List:       linux-ide-arrays
Subject:    Re: Benchmarks
From:       Joshua Baker-LePain <jlb17 () duke ! edu>
Date:       2003-03-26 16:03:31
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On Wed, 26 Mar 2003 at 12:32am, Russell Coker wrote

> On Tue, 25 Mar 2003 23:47, Joshua Baker-LePain wrote:
> > > 4GB DDR SDRAM
> > > 2x 3ware 7500-8 (running 7.5 codeset, RAID5 w/ hot spare)
> > 
> > Just a little update on this.  The system has been in production since
> > August.  I recently moved to kernel 2.4.18-18SGI_XFS_1.2.0smp and the
> > 7.5.3 codeset from 3ware.  Today, on a whim, I reran bonnie++ on the
> > production config (with 4096K chunk-size on the software RAID0) as well as
> > running tiobench.
> > 
> > The bonnie++ results are... interesting:
> > 
> > Err, 455MB/s reading?  I've benched a single card at 205MB/s, and I
> > wouldn't exactly expect a superlinear speedup.  Not specifying chunksize
> > makes for a little more realism:
> 
> Please try repeating the tests with 16G data size to eliminate possible 
> affects of caching.
> 
> I am concerned that the XFS kernel may do something more intelligent with 
> caching than the regular kernels and therefore a test of 2*RAM may not be 
> large enough to test the true speed of the hardware.

Yep, that seems to have done it:

[jlb@fluffy jlb]$ bonnie++ -s 16384
Version 1.02c       ------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
fluffy          16G 24041  99 125828  41 77667  37 25443  99 350311  90 244.3   4
                    ------Sequential Create------ --------Random Create--------
                    -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
                 16  2145  23 +++++ +++  1947  21  1580  18 +++++ +++  1384  16
fluffy,16G,24041,99,125828,41,77667,37,25443,99,350311,90,244.3,4,16,2145,23,+++++,+++,1947,21,1580,18,+++++,+++,1384,16


[jlb@fluffy jlb]$ bonnie++ -s 16384:64k
Version 1.02c       ------Sequential Output------ --Sequential Input- --Random-
                    -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine   Size:chnk K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
fluffy      16G:64k 23662  99 122992  36 78679  32 25383  99 364359  88 188.5   5
                    ------Sequential Create------ --------Random Create--------
                    -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
                 16  1783  20 +++++ +++  1945  22  2203  24 +++++ +++  1748  21
fluffy,16G:64k,23662,99,122992,36,78679,32,25383,99,364359,88,188.5,5,16,1783,20,+++++,+++,1945,22,2203,24,+++++,+++,1748,21


-- 
Joshua Baker-LePain
Department of Biomedical Engineering
Duke University


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