linux-kernel - Re: Performance issue since 3.2.6

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Date:	Mon, 21 Jan 2013 23:49:34 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Olivier Doucet <webmaster@...ux.com>
Cc:	Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org
Subject: Re: Performance issue since 3.2.6

On Monday, January 21, 2013 03:26:10 PM Olivier Doucet wrote:
> >> FYI, I benchmarked a new version with :
> >> CONFIG_PM_RUNTIME=y
> >> CONFIG_PM=y
> >>
> >> but the performance loss is still present.
> >
> > In that case it is not quite likely that the commit you bisected to
> > really introduced the problem, because it doesn't change things for
> > CONFIG_PM=y.
> >
> > Does reverting that commit still help?
> 
> I tested several combinations. Results follows :
> 3.2.6 (base) + CONFIG_PM unset  => BAD
> 3.2.6 (base) + CONFIG_PM=y  => BAD
> 3.2.6 (base) + patch reverted + CONFIG_PM=y  => BAD
> 3.2.6 (base) + patch reverted + CONFIG_PM unset  => GOOD

I see.  Two bugs, then.

> So if I understand right, the targeted patch introduced the bug when
> CONFIG_PM is unset, but there is an other bug when this var is set.
> I'll try to track this commit.

Thanks a lot!

Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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