linux-kernel - Re: [patch] i386, numaq: enable TSCs again

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Message-ID: <20070525084115.GA29077@elte.hu>
Date:	Fri, 25 May 2007 10:41:15 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	William Lee Irwin III <wli@...omorphy.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Satyam Sharma <satyam.sharma@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [patch] i386, numaq: enable TSCs again


* William Lee Irwin III <wli@...omorphy.com> wrote:

> > yes, that's what i meant under 'slightly async'. Some AMD CPUs are 
> > like that too and sched_clock() now handles that fine. So we should 
> > try my patch.
> 
> Sorry, then. I took slight to mean something else. In any event I was 
> only quantifying things. I've no opinion whatsoever on the impact of 
> the code on NUMA-Q, only some recall of its operating characteristics.

there's no need to apologize at all! Thanks for reminding us about the 
time-scale and nature of the TSC drift on NUMAQ. I was worried that 
maybe the TSC was totally unusable for some reason - but that's 
fortunately not the case. So we now have one quirk less, hopefully :-)

	Ingo
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