From: Mike Anderson <andmike@us.ibm.com>
To: Dave Hansen <haveblue@us.ibm.com>
Cc: "Bond, Andrew" <Andrew.Bond@hp.com>, linux-kernel@vger.kernel.org
Subject: Re: TPC-C benchmark used standard RH kernel
Date: Fri, 20 Sep 2002 10:20:41 -0700 [thread overview]
Message-ID: <20020920172041.GB1944@beaverton.ibm.com> (raw)
In-Reply-To: <3D8A3654.50201@us.ibm.com>
Dave Hansen [haveblue@us.ibm.com] wrote:
> Bond, Andrew wrote:
> > This isn't as recent as I would like, but it will give you an idea.
> > Top 75 from readprofile. This run was not using bigpages though.
> >
> > 00000000 total 7872 0.0066
> > c0105400 default_idle 1367 21.3594
> > c012ea20 find_vma_prev 462 2.2212
> > c0142840 create_bounce 378 1.1250
> > c0142540 bounce_end_io_read 332 0.9881
.. snip..
>
> Forgive my complete ignorane about TPC-C... Why do you have so much
> idle time? Are you I/O bound? (with that many disks, I sure hope not
> :) ) Or is it as simple as leaving profiling running for a bit before
> or after the benchmark was run?
The calls to create_bounce and bounce_end_io_read are indications that
some of your IO is being bounced and will not be running a peak
performance.
This is avoided by using the highmem IO changes which I believe are not
in the standard RH kernel. Unknown if that would address your idle time
question.
-andmike
--
Michael Anderson
andmike@us.ibm.com
next prev parent reply other threads:[~2002-09-20 17:14 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-19 19:27 Bond, Andrew
2002-09-19 20:40 ` Dave Hansen
2002-09-20 17:20 ` Mike Anderson [this message]
2002-09-20 17:31 ` Jens Axboe
2002-09-20 18:05 ` Mike Anderson
2002-09-20 20:56 ` William Lee Irwin III
2002-09-20 22:07 ` Martin J. Bligh
-- strict thread matches above, loose matches on Subject: below --
2002-09-20 17:43 Bond, Andrew
2002-09-19 21:18 Bond, Andrew
2002-09-19 21:48 ` Dave Hansen
2002-09-19 19:15 Bond, Andrew
2002-09-19 17:15 Bond, Andrew
2002-09-19 18:14 ` Dave Hansen
2002-09-19 19:05 ` Martin J. Bligh
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