linux-kernel - Re: [PATCH] PCI Express ASPM support should default to 'No'

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Message-ID: <87abjjzo84.fsf@basil.nowhere.org>
Date:	Thu, 24 Apr 2008 09:49:47 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Shaohua Li <shaohua.li@...el.com>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Jesper Juhl <jesper.juhl@...il.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH] PCI Express ASPM support should default to 'No'

Shaohua Li <shaohua.li@...el.com> writes:

> On Tue, 2008-04-22 at 17:12 -0700, Jesse Barnes wrote:
>> On Tuesday, April 22, 2008 3:28 pm Jesper Juhl wrote:
>> > Running 'make oldconfig' I just noticed that PCIEASPM defaults to
>> > 'y' in Kconfig even though the feature is both experimental and the
>> > help text recommends that if you are unsure you say 'n'.
>> > It seems to me that this really should default to 'n', not 'y' at the
>> > moment.
>> > The following patch makes that change. Please consider applying.
>> 
>> Seem reasonable, Shaohua?  Please cc linux-pci on PCI patches
>> though...
> Ok, I'm fine with the patch. Though by default, the policy is to use
> BIOS setting, that is if BIOS disables ASPM, we don't enable it too.

Once the feature is considered stable it would be nice to make it default y
again. I think any power saving should be on by default (unless serious
issues are known), not off.

-Andi
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