Re: Performance issue since 3.2.6

[Olivier Doucet]

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@xxxxxxxxx>
>
> 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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/