linux-kernel - Re: [PATCH] a patch to fix the cpu-offline-online problem caused by pm

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Message-ID: <1296483467.26581.26.camel@laptop>
Date:	Mon, 31 Jan 2011 15:17:47 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Luming Yu <luming.yu@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, Len Brown <lenb@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>, tglx <tglx@...utronix.de>
Subject: Re: [PATCH] a patch to fix the cpu-offline-online problem caused
 by pm_idle

On Mon, 2011-01-31 at 09:10 -0500, Luming Yu wrote:
> 
> My understanding is if the heart of the problem is triggered by some
> hardware defects.
> And we could have no other clean option than a solution I proposed
> here. 

Well, a cleaner option is to limit NHM-EX hardware to C1 and simply
dis-allow anything deeper on it.

> Yes, I agree before say yes to a "workaround", we need to understand
> exactly what those side effects are. I will try to do research on all
> side effects caused by the ipi and c3 latency to tickless and highres
> kernel after one week vacation starting from Feb 1st.
> 
OK, great! and enjoy your time away from the computer ;-)

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