linux-kernel - Re: phenom, amd780g, tsc, hpet, kvm, kernel -- who's at fault?

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Message-ID: <20090323154137.GA1259@elte.hu>
Date:	Mon, 23 Mar 2009 16:41:37 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Michael Tokarev <mjt@....msk.ru>
Cc:	Avi Kivity <avi@...hat.com>, John Stultz <johnstul@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-kernel <linux-kernel@...r.kernel.org>,
	KVM list <kvm@...r.kernel.org>
Subject: Re: phenom, amd780g, tsc, hpet, kvm, kernel -- who's at fault?


* Michael Tokarev <mjt@....msk.ru> wrote:

> Now, after quite some googling around, I tried to disable hpet, 
> booting with hpet=disable parameter.  And that one fixed all the 
> problems at once. 7 days uptime, I stress-tested it several times, 
> it works with TSC as timesource (still a problem within guests as 
> those shows unstable TSC anyway) since boot, no issues logged.  
> Even cpufreq works as expected...
>
> Note that i tried to disable hpet as clocksource several times but 
> without any noticeable effect - kernel still used hpet and hpet2 
> for something, and printed that scary "increasing min_delay" 
> message on a semi-regular basis usually after the next 'stuck' 
> state....

It could again go bad like it did before - those messages are signs 
of HPET weirdnesses.

Probably your box's hpet needs to be blacklisted, so that it gets 
disabled automatically on bootup.

	Ingo
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