linux-kernel - Re: [kvm-devel] Guest kernel hangs in smp kvm for older kernels prior to tsc sync cleanup

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Message-ID: <476936E2.9010902@qumranet.com>
Date:	Wed, 19 Dec 2007 17:21:06 +0200
From:	Avi Kivity <avi@...ranet.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	kvm-devel <kvm-devel@...ts.sourceforge.net>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [kvm-devel] Guest kernel hangs in smp kvm for older kernels	prior
 to tsc sync cleanup

Ingo Molnar wrote:
> try this test perhaps in an SMP guest:
>
>  http://people.redhat.com/mingo/time-warp-test/time-warp-test.c
>
> you can ignore TSC warps - but no GTOD or CLOCK warps should occur.
>
>   

On a broken guest kernel, I see gtod and clock warps.  On a good guest 
kernel, I do not, presumably because the tsc clocksource is marked as 
unstable.

I see tsc warps on both.  8 threads on 4 cpus.

-- 
error compiling committee.c: too many arguments to function

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