From: Paolo Bonzini <pbonzini@redhat.com>
To: kvm@vger.kernel.org
Subject: Re: Live migration locks up 3.2 guests in do_timer(ticks ~ 500000)
Date: Tue, 16 Sep 2014 10:42:41 +0200 [thread overview]
Message-ID: <5417F801.20408@redhat.com> (raw)
In-Reply-To: <20140915181441.GN23305@hydra.tuxags.com>
Il 15/09/2014 20:14, Matt Mullins ha scritto:
> On Tue, Sep 09, 2014 at 11:53:49PM -0700, Matt Mullins wrote:
>> On Mon, Sep 08, 2014 at 06:18:46PM +0200, Paolo Bonzini wrote:
>>> What version of QEMU? Can you try the 12.04 qemu (which IIRC is 1.0) on
>>> top of the newer kernel?
>>
>> I did reproduce this on qemu 1.0.1.
>>
>> What would you like me to test next? I've got both VM hosts currently running
>> 3.17-rc4, so I'll know tomorrow if that works.
>>
>> I've been looking into this off-and-on for a while now, and this time around I
>> may have found other folks experiencing the same issue:
>> https://issues.apache.org/jira/browse/CLOUDSTACK-6788
>> That one's a little empty on the details (do y'all know more about to whom that
>> bug was "known" than I do?), but
>> https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1297218
>> sees similar symptoms due to running NTP on the host. I may try disabling that
>> after the current round of testing-3.17-rc4 finishes up.
>
> A summary of my testing from last week:
> * 3.17-rc4 (with qemu 2.0) seems to have had the same problem as well.
> * Disabling ntpd didn't help either.
> * <timer name="kvmclock" present="no"/> _does_ seem to make my VM migrate
> without issue.
>
> I'm not really sure what to look at from here. I suppose leaving kvmclock
> disabled is a workaround for now, but is there a major disadvantage to doing
> so?
Sorry for not following up. I think we have QEMU patches to fix this
issue. I'll reply as soon as they are available in a git tree.
Paolo
next prev parent reply other threads:[~2014-09-16 8:42 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-08 5:54 Live migration locks up 3.2 guests in do_timer(ticks ~ 500000) Matt Mullins
2014-09-08 8:18 ` Paolo Bonzini
2014-09-08 15:56 ` Matt Mullins
2014-09-08 16:18 ` Paolo Bonzini
2014-09-08 16:39 ` Matt Mullins
2014-09-10 6:53 ` Matt Mullins
2014-09-15 18:14 ` Matt Mullins
2014-09-16 8:42 ` Paolo Bonzini [this message]
2014-10-27 18:42 ` Matt Mullins
2014-10-28 9:04 ` Paolo Bonzini
2014-11-11 19:57 ` Matt Mullins
2014-11-12 8:59 ` Paolo Bonzini
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