linux-kernel - Re: [PATCH] x86 idle: repair large-server 50-watt idle-power regression

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Message-ID: <20131219173629.GJ2480@laptop.programming.kicks-ass.net>
Date:	Thu, 19 Dec 2013 18:36:29 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Len Brown <lenb@...nel.org>,
	x86@...nel.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, Len Brown <len.brown@...el.com>,
	stable@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mike Galbraith <efault@....de>, Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH] x86 idle: repair large-server 50-watt idle-power
 regression

On Thu, Dec 19, 2013 at 06:25:35PM +0100, Peter Zijlstra wrote:
> That said, I would find it very strange indeed if a CLFLUSH doesn't also
> flush the store buffer.

OK, it explicitly states it does not do that and you indeed need an
mfence before the clflush.


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