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Subject: Re: [BENCHMARK] 2.4.{18,19{-ck9},20rc1{-aa1}} with contest
From: Stephen Lord <lord@sgi.com>
To: Con Kolivas <conman@kolivas.net>
Cc: Jens Axboe <axboe@suse.de>, Andrew Morton <akpm@digeo.com>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Marcelo Tosatti <marcelo@conectiva.com.br>,
       Andrea Arcangeli <andrea@suse.de>
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On Sat, 2002-11-09 at 07:09, Con Kolivas wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> 
> >On Sat, Nov 09 2002, Con Kolivas wrote:
> >> >You're showing a big shift in behaviour between 2.4.19 and 2.4.20-rc1.
> >> >Maybe it doesn't translate to worsened interactivity.  Needs more
> >> >testing and anaysis.
> >>
> >> Sounds fair enough. My resources are exhausted though. Someone else have
> >> any thoughts?
> >
> >Try setting lower elevator passover values. Something ala
> >
> ># elvtune -r 64 /dev/hda
> >
> >(or whatever your drive is)
> 
> Heres some more data:
> 
> io_load:
> Kernel [runs]           Time    CPU%    Loads   LCPU%   Ratio
> 2.4.20-rc1 [2]          1142.2  6       90      10      16.00
> 2420rc1r64 [3]          575.0   12      43      10      8.05
> 
> That's it then. Should I run a family of different values and if so over what 
> range?
> 


There is more going on than this, XFS suffered a major slowdown in some
metadata write only benchmarks - the file create/delete phase of 
bonnie++. Now thats a single app only doing writes. Slowdown on the
order of 500% to 600%. Since we did not follow the pre kernels in
2.4.20 we do not really know when it was introduced and there is
a possibility XFS itself has not followed some api change.

Steve



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