linux-kernel - Re: Performance issue since 3.2.6

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Date:	Fri, 17 May 2013 20:17:40 +0200
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

Hello,

This performance penalty is still present in kernel 3.9.2. And
CONFIG_PM cannot be deactivated anymore.

I was able to make a working 3.9.2 (meaning with no penalty)  with
following config and patch :
CONFIG_PM=y
CONFIG_PM_SLEEP=y
CONFIG_PM_SLEEP_SMP=y
CONFIG_CPU_IDLE=y
CONFIG_ACPI=y
CONFIG_ACPI_PROCESSOR=y

Patch : https://gist.github.com/odoucet/5600630

I know this patch is not perfect because it is just equivalent to
rollback commit f51d67a64f32cd81ea8b67ca964fb7cf7e783b2e ;

I really want this to be fixed in kernel, so I would be glad to test
any patch / config file you want.


2013/2/12 Olivier Doucet <webmaster@...ux.com>
>
> Hello,
>
> A quick update on my latest tests :
> I was able to compile a working 3.7.1 kernel (by 'working', I mean
> with no performance penalty). I'm sure 3.7.7 will be OK also (do you
> want me to test latest RC of 3.8 ?)
>
> I had to disable CONFIG_ACPI_PROCESSOR to disable power management.
> So now these two options are unset :
> CONFIG_CPU_IDLE
> CONFIG_ACPI_PROCESSOR
>
> I've posted the whole .config file here :
> https://gist.github.com/odoucet/4773390
>
> I'll be glad to test any patch that may help reactivate PM on my
> system (CPU Intel Xeon L5630)
>
> Olivier
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