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

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Message-Id: <1209024126.7479.0.camel@sli10-desk.sh.intel.com>
Date:	Thu, 24 Apr 2008 16:02:06 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	Andi Kleen <andi@...stfloor.org>
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'


On Thu, 2008-04-24 at 09:49 +0200, Andi Kleen wrote:
> 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.
yes, we could do it in next release.

Thanks,
Shaohua

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