From: Christian Borntraeger <borntraeger@de.ibm.com>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>,
kvm-devel@lists.sourceforge.net, Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org
Subject: Re: [PATCH/RFC] stop_machine: make stop_machine_run more virtualization friendly
Date: Thu, 8 May 2008 16:41:20 +0200 [thread overview]
Message-ID: <200805081641.20572.borntraeger@de.ibm.com> (raw)
In-Reply-To: <48230137.9090705@goop.org>
Am Donnerstag, 8. Mai 2008 schrieb Jeremy Fitzhardinge:
> Christian Borntraeger wrote:
> > On kvm I have seen some rare hangs in stop_machine when I used more guest
> > cpus than hosts cpus. e.g. 32 guest cpus on 1 host cpu triggered the
> > hang quite often. I could also reproduce the problem on a 4 way z/VM host
with
> > a 64 way guest.
> >
>
> I think that's one of those "don't do that then" cases ;)
I really like 64 guest cpus as a good testcase for all kind of things.
>
> I think x86 (at least) is now using ticket locks, which is fair. Which
> kernel are you seeing this problem on?
Sorry, forgot to mention. Its kvm.git from 2 days ago on s390.
next prev parent reply other threads:[~2008-05-08 14:41 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-08 13:20 [PATCH/RFC] stop_machine: make stop_machine_run more virtualization friendly Christian Borntraeger
2008-05-08 13:33 ` Jeremy Fitzhardinge
2008-05-08 14:41 ` Christian Borntraeger [this message]
2008-05-08 14:58 ` Jeremy Fitzhardinge
2008-05-08 16:23 ` Christian Borntraeger
2008-05-09 1:10 ` Rusty Russell
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