From: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
To: Izik Eidus <izike-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org,
Andrea Arcangeli <andrea-Vyt77T80VFVWk0Htik3J/w@public.gmane.org>
Subject: Re: external module sched_in event
Date: Sat, 22 Dec 2007 22:24:26 +0200 [thread overview]
Message-ID: <476D727A.7090104@qumranet.com> (raw)
In-Reply-To: <476BFD74.2040509-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
Izik Eidus wrote:
>> This fixes my longstanding KVM instability and "-smp 2" now works
>> flawlessy with svm too! -smp 2 -snapshot crashes in qemu userland but
>> that's not kernel related, must be some thread mutex lock recursion or
>> lock inversion in the qcow cow code. Removing -snapshot make -smp 2
>> stable. Multiple guests UP and SMP seems stable too.
>>
>>
> you mean that without -snapshot, the userspace not hang at the sigwait()
> in the qcow code?
>
The problem is probably exaggerated by -snapshot, which needs much more
metadata activity than without -snapshot.
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
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next prev parent reply other threads:[~2007-12-22 20:24 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-21 17:40 external module sched_in event Andrea Arcangeli
[not found] ` <20071221174048.GB1292-lysg2Xt5kKMAvxtiuMwx3w@public.gmane.org>
2007-12-21 17:52 ` Izik Eidus
[not found] ` <476BFD74.2040509-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-12-21 18:22 ` Andrea Arcangeli
[not found] ` <20071221182257.GG1292-lysg2Xt5kKMAvxtiuMwx3w@public.gmane.org>
2007-12-21 18:50 ` mailman setup for kvm-devel (was Re: external module sched_in event) Carlo Marcelo Arenas Belon
2007-12-22 20:21 ` Avi Kivity
2007-12-22 20:24 ` Avi Kivity [this message]
-- strict thread matches above, loose matches on Subject: below --
2007-12-20 16:23 external module sched_in event Andrea Arcangeli
[not found] ` <20071220162353.GA3802-lysg2Xt5kKMAvxtiuMwx3w@public.gmane.org>
2007-12-22 19:13 ` Avi Kivity
[not found] ` <476D61E8.5000102-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-12-23 16:49 ` Andrea Arcangeli
[not found] ` <20071223164932.GA8483-lysg2Xt5kKMAvxtiuMwx3w@public.gmane.org>
2007-12-23 17:37 ` Avi Kivity
[not found] ` <476E9CE4.2060705-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-12-24 16:26 ` Andrea Arcangeli
[not found] ` <20071224162639.GH8483-lysg2Xt5kKMAvxtiuMwx3w@public.gmane.org>
2007-12-25 9:00 ` Avi Kivity
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