linux-kernel - Re: [URGENT rfc patch 0/3] tsc clocksource bug fix

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Message-ID: <20130705143833.GT23916@twins.programming.kicks-ass.net>
Date:	Fri, 5 Jul 2013 16:38:33 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Alex Shi <alex.shi@...el.com>, tglx@...utronix.de,
	hpa@...ux.intel.com, tim.c.chen@...ux.intel.com,
	linux-kernel@...r.kernel.org, andi.kleen@...el.com, mingo@...e.hu
Subject: Re: [URGENT rfc patch 0/3] tsc clocksource bug fix

On Fri, Jul 05, 2013 at 04:23:33PM +0200, Frederic Weisbecker wrote:
> Nope, I haven't touched that. I prefer not to fiddle with unstable
> clocksource for now :)
> 
> As for unstable TSCs, if sched_clock_tick() needs to be fed, we simply
> don't stop the tick.

Not entirely the same thing; I thought the clocksource watchdog was ran
even when we have a 'stable' TSC, just to make sure it stays stable.
There's known cases where the BIOS f*cks us over and wrecks TSC sync.


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