From: Avi Kivity <avi@qumranet.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: kvm-devel <kvm-devel@lists.sourceforge.net>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [kvm-devel] Guest kernel hangs in smp kvm for older kernels prior to tsc sync cleanup
Date: Wed, 19 Dec 2007 17:21:06 +0200 [thread overview]
Message-ID: <476936E2.9010902@qumranet.com> (raw)
In-Reply-To: <20071219150938.GA15267@elte.hu>
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
WARNING: multiple messages have this Message-ID (diff)
From: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
To: Ingo Molnar <mingo-X9Un+BFzKDI@public.gmane.org>
Cc: kvm-devel
<kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>,
linux-kernel
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: Guest kernel hangs in smp kvm for older kernels prior to tsc sync cleanup
Date: Wed, 19 Dec 2007 17:21:06 +0200 [thread overview]
Message-ID: <476936E2.9010902@qumranet.com> (raw)
In-Reply-To: <20071219150938.GA15267-X9Un+BFzKDI@public.gmane.org>
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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next prev parent reply other threads:[~2007-12-19 15:21 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-18 17:20 Guest kernel hangs in smp kvm for older kernels prior to tsc sync cleanup Avi Kivity
2007-12-18 17:20 ` Avi Kivity
2007-12-18 22:19 ` Ingo Molnar
2007-12-18 22:19 ` Ingo Molnar
2007-12-19 6:33 ` Avi Kivity
2007-12-19 6:33 ` Avi Kivity
2007-12-19 11:19 ` [kvm-devel] " Avi Kivity
2007-12-19 11:19 ` Avi Kivity
2007-12-19 11:39 ` [kvm-devel] " Avi Kivity
2007-12-19 14:06 ` Ingo Molnar
2007-12-19 14:06 ` Ingo Molnar
2007-12-19 14:27 ` [kvm-devel] " Avi Kivity
2007-12-19 15:32 ` Glauber de Oliveira Costa
2007-12-19 15:32 ` Glauber de Oliveira Costa
2007-12-19 15:41 ` [kvm-devel] " Avi Kivity
2007-12-20 10:34 ` Glauber de Oliveira Costa
2007-12-20 10:34 ` Glauber de Oliveira Costa
2007-12-19 16:55 ` [kvm-devel] " Amit Shah
2007-12-19 16:55 ` Amit Shah
2007-12-19 17:04 ` [kvm-devel] Guest kernel hangs in smp kvm for older kernelsprior " Dor Laor
2007-12-19 17:04 ` Dor Laor
2007-12-19 17:09 ` [kvm-devel] " Avi Kivity
2007-12-19 17:09 ` Avi Kivity
2007-12-19 14:53 ` [kvm-devel] Guest kernel hangs in smp kvm for older kernels prior " Avi Kivity
2007-12-19 14:53 ` Avi Kivity
2007-12-19 15:09 ` [kvm-devel] " Ingo Molnar
2007-12-19 15:21 ` Avi Kivity [this message]
2007-12-19 15:21 ` Avi Kivity
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