linux-kernel - Re: Performance issue since 3.2.6

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Message-ID: <CAPPqfY2umN2Fab=APyt4=LM32x2av7nPruADX3dddTxdWG2Umg@mail.gmail.com>
Date:	Mon, 21 Jan 2013 23:57:06 +0100
From:	Olivier Doucet <webmaster@...ux.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org
Subject: Re: Performance issue since 3.2.6

Good evening,

>> I'll try to track this commit.
>
> Thanks a lot!

I failed to find a working version today with CONFIG_PM=y
(tested 3.2.6, 3.2.5, 3.2.0, 3.0.1, 2.6.32.8). I'll try older kernels tomorrow.

I'm very sceptical now : how can a bug with such a big impact (25%
performance drop) can survive for so many years, with no one seeing it
?
Good point is that benchmark can be easily done (it took less than an
hour to test a new version). If you have patches to be tested, feel
free to ask :)

In the meanwhile, do you think I can compile a working 3.7 kernel ?
Maybe by activating / deactivating specific options ?

Olivier
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