linux-kernel - Re: [BUG] 2.6.21-rc1,2,3 regressions on my system that I found so far

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Message-ID: <20071230145304.GS16946@elte.hu>
Date:	Sun, 30 Dec 2007 15:53:04 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Mike Galbraith <efault@....de>
Cc:	tglx@...utronix.de, Maxim <maximlevitsky@...il.com>,
	Len Brown <lenb@...nel.org>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [BUG] 2.6.21-rc1,2,3 regressions on my system that I found so
	far


* Mike Galbraith <efault@....de> wrote:

> > Is this after resume ? If yes, then something (probably BIOS) is 
> > fiddling with the TSC of one CPU when the resume happens.
> 
> My P4 box has the same "problem", which is remedied by..

> -	start = get_cycles_sync();
> +	start = last_tsc = get_cycles_sync();

this is slightly racy - your second patch that initializes things 
properly is the right solution IMO. I'm wondering, if others are seeing 
this too, should we make this a v2.6.24 item? It's a bit late for that i 
think - although it shouldnt hurt.

	Ingo
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