netdev - Re: 2.6.30-rc deadline scheduler performance regression for iozone over NFS

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Date:	Mon, 18 May 2009 10:15:22 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Trond Myklebust <trond.myklebust@....uio.no>
Cc:	netdev@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	linux-kernel@...r.kernel.org, "Rafael J. Wysocki" <rjw@...k.pl>,
	Olga Kornievskaia <aglo@...i.umich.edu>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Jim Rees <rees@...ch.edu>, linux-nfs@...r.kernel.org
Subject: Re: 2.6.30-rc deadline scheduler performance regression for iozone over NFS

Trond Myklebust <trond.myklebust@....uio.no> writes:

> On Sun, 2009-05-17 at 15:11 -0400, Trond Myklebust wrote:
>> On Thu, 2009-05-14 at 11:00 -0400, Jeff Moyer wrote:
>> > Sorry for the previous, stupid question.  I applied the patch in
>> > addition the last one and here are the results:
>> > 
>> > 70327
>> > 71561
>> > 68760
>> > 69199
>> > 65324
>> > 
>> > A packet capture for this run is available here:
>> >   http://people.redhat.com/jmoyer/trond2.pcap.bz2
>> > 
>> > Any more ideas?  ;)
>> 
>> Yep. I've got 2 more patches for you. With both of them applied, I'm
>> seeing decent performance on my own test rig. The first patch is
>> appended. I'll send the second in another email (to avoid attachments).
>
> Here is number 2. It is incremental to all the others...

With all 4 patches applied, these are the numbers for 5 runs:

103168
101212
103346
100842
103172

It's looking much better, but we're still off by a few percent.  Thanks
for the quick turnaround on this, Trond!  If you submit these patches,
feel free to add:

Tested-by: Jeff Moyer <jmoyer@...hat.com>

Cheers,
Jeff
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