From: Andrey Korolyov <andrey@xdel.ru>
To: Marcelo Tosatti <mtosatti@redhat.com>
Cc: "Paolo Bonzini" <pbonzini@redhat.com>,
"Marcin GibuÅ a" <m.gibula@beyond.pl>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [patch 0/3] kvmclock: Ensure time in migration never goes backward (v3)
Date: Fri, 5 Sep 2014 23:35:30 +0400 [thread overview]
Message-ID: <CABYiri_55dh-utHo0TyWvqmTF=4U9F0-x5Oe1neTB4pyWQ2ekg@mail.gmail.com> (raw)
In-Reply-To: <CABYiri-atxuDcezre_Rtk0th84mC8v+khDBcK-adONPGzMcBaw@mail.gmail.com>
On Fri, Sep 5, 2014 at 10:35 PM, Andrey Korolyov <andrey@xdel.ru> wrote:
> On Fri, Sep 5, 2014 at 10:26 PM, Marcelo Tosatti <mtosatti@redhat.com> wrote:
>> On Fri, Sep 05, 2014 at 10:16:17PM +0400, Andrey Korolyov wrote:
>>> On Fri, Sep 5, 2014 at 5:52 PM, Marcelo Tosatti <mtosatti@redhat.com> wrote:
>>> > Regression fix tested with fio and ping-pong migration.
>>> >
>>> >
>>>
>>> Thanks, actually this series also introduces regression with average
>>> live migration time - 42s avg vs 7s avg for the reference VM on
>>> ping-pong test. Can you please confirm this?
>>
>> Can't confirm - migration time is similar for me.
>>
>> What workload are you using?
>>
>
> Just an 'empty' VM on reference test and fio tests at the
> patch-specific test suite. Actual presence of workload brings
> difference for about 2s, effectively unmeasurable on a small series of
> 40+s migration times.
Heh... hit independent bug due to different pre-test conditions, the
patch itself is ok.
Bug follows:
- boot up a VM, make sure to feed it heavy long task, for example
kernel compilation,
- neither migrate once in the middle of process (with fallback to
non-live migration which is available in libvirt, else it may take
forever) or just wait up to the end,
- live migration time degrades from sub-10s value to larger values
forever, not regarding if workload is still presented or not.
next prev parent reply other threads:[~2014-09-05 19:35 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-05 13:52 [Qemu-devel] [patch 0/3] kvmclock: Ensure time in migration never goes backward (v3) Marcelo Tosatti
2014-09-05 13:52 ` [Qemu-devel] [patch 1/3] kvmclock: Ensure time in migration never goes backward Marcelo Tosatti
2014-09-09 15:12 ` Marcelo Tosatti
2014-09-09 21:16 ` Alexander Graf
2014-09-09 23:07 ` Marcelo Tosatti
2014-09-05 13:52 ` [Qemu-devel] [patch 2/3] Introduce cpu_clean_all_dirty Marcelo Tosatti
2014-09-05 13:52 ` [Qemu-devel] [patch 3/3] kvmclock: Ensure proper env->tsc value for kvmclock_current_nsec calculation Marcelo Tosatti
2014-09-05 18:16 ` [Qemu-devel] [patch 0/3] kvmclock: Ensure time in migration never goes backward (v3) Andrey Korolyov
2014-09-05 18:26 ` Marcelo Tosatti
2014-09-05 18:29 ` Paolo Bonzini
2014-09-05 18:35 ` Andrey Korolyov
2014-09-05 19:35 ` Andrey Korolyov [this message]
2014-09-05 22:14 ` Paolo Bonzini
2014-09-05 23:05 ` Andrey Korolyov
2014-09-09 17:54 ` Andrey Korolyov
2014-09-16 9:14 ` Paolo Bonzini
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