From: Jens Axboe <axboe@suse.de>
To: Con Kolivas <conman@kolivas.net>
Cc: Andrew Morton <akpm@digeo.com>, linux-kernel@vger.kernel.org
Subject: Re: [BENCHMARK] 2.5.39 with contest 0.41
Date: Sat, 28 Sep 2002 11:08:06 +0200 [thread overview]
Message-ID: <20020928090806.GI23468@suse.de> (raw)
In-Reply-To: <1033201873.3d9568d158a72@kolivas.net>
On Sat, Sep 28 2002, Con Kolivas wrote:
> > > io_load:
> > > Kernel Time CPU Ratio
> > > 2.4.19 216.05 33% 3.19
> > > 2.5.38 887.76 8% 13.11*
> > > 2.5.38-mm3 105.17 70% 1.55*
> > > 2.5.39 216.81 37% 3.20
> >
> > -mm3 has fifo_batch=16. 2.5.39 has fifo_batch=32.
That's not the only difference, btw.
> > > mem_load:
> > > Kernel Time CPU Ratio
> > > 2.4.19 105.40 70% 1.56
> > > 2.5.38 107.89 73% 1.59
> > > 2.5.38-mm3 117.09 63% 1.73*
> > > 2.5.39 103.72 72% 1.53
> >
> > 2.5's swapout is still fairly synchronously sucky. So low-latency
> > writeout could be advantageous there. This difference is probably
> > also the fifo_batch thing. Or maybe statistical?
> >
> >
> > I did some testing with your latest. 4xPIII, mem=512m, SCSI,
> > tag depth = 0, 2.5.39-mm1 candidate:
> >
> > fifo_batch=32:
> >
> > noload 2:34.53 291%
> > cpuload 2:36.20 286%
> > memload 2:19.44 333%
> > ioloadhalf 2:34.81 303%
> > ioloadfull 3:15.47 238%
> >
> > (err. memload sped it up!)
> >
> > fifo_batch=16:
> >
> > noload 2:00.03 380%
> > cpuload 2:27.62 304%
> > memload 2:22.59 326%
> > ioloadhalf 2:33.75 306%
> > ioloadfull 2:59.18 259%
> >
> > - Something went horridly wrong in the first `noload' test.
> > - fifo_batch=16 is better than 32.
> > - you see a 4x hit from io_load. I see a 1.5x hit.
So far fifo_batch=16 looks pretty good. Doesn't quite make sense to me.
Need to bench/test some more :-)
--
Jens Axboe
next prev parent reply other threads:[~2002-09-28 9:03 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-28 6:58 [BENCHMARK] 2.5.39 with contest 0.41 Con Kolivas
2002-09-28 8:23 ` Andrew Morton
2002-09-28 8:31 ` Con Kolivas
2002-09-28 8:45 ` Andrew Morton
2002-09-28 9:08 ` Jens Axboe [this message]
2002-09-28 9:17 ` Con Kolivas
2002-09-28 15:17 Paolo Ciarrocchi
2002-09-28 23:59 ` Con Kolivas
2002-09-29 9:00 Paolo Ciarrocchi
2002-09-29 9:17 ` Con Kolivas
2002-09-29 17:14 Paolo Ciarrocchi
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20020928090806.GI23468@suse.de \
--to=axboe@suse.de \
--cc=akpm@digeo.com \
--cc=conman@kolivas.net \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).