linux-kernel - Re: 2.6.27-rc8-git7: Reported regressions from 2.6.26

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Date:	Sun, 05 Oct 2008 19:49:31 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	rjw@...k.pl (Rafael J. Wysocki)
Cc:	johnpol@....mipt.ru, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	protasnb@...il.com, kernel-testers@...r.kernel.org,
	netdev@...r.kernel.org, davem@...emloft.net,
	cl@...ux-foundation.org
Subject: Re: 2.6.27-rc8-git7: Reported regressions from 2.6.26

Rafael J. Wysocki <rjw@...k.pl> wrote:
>> > Bug-Entry   : http://bugzilla.kernel.org/show_bug.cgi?id=11308
>> > Subject             : tbench regression on each kernel release from 2.6.22 -&gt; 2.6.28
>> > Submitter   : Christoph Lameter <cl@...ux-foundation.org>
>> > Date                : 2008-08-11 18:36 (55 days old)
>> > References  : http://marc.info/?l=linux-kernel&m=121847986119495&w=4
>> >               http://marc.info/?l=linux-kernel&m=122125737421332&w=4
>> 
>> Just for the reference, this one regresses from the 2.6.23.
> 
> Still, tbench results from 2.6.26 are better than from 2.6.27-rc.
> That's why it's still on the list, but if you think that's not relevant, please
> let me know and I'll drop it.

Note that 2.6.27 beats 2.6.26 by 30% with bulk traffic over
loopback as opposed to the small packets sent by tbench where
I saw a 5% drop in performance on my machine.

So I'm not sure whether this should really be classified as
a regression if we limit ourselves to the changes between 26
and 27.

The changes prior to 26 seem to be more significant.

Chyeers,
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