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Re: [Qemu-devel] [PATCH] migration: Increase default max_downtime from 3
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From: |
Amit Shah |
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Subject: |
Re: [Qemu-devel] [PATCH] migration: Increase default max_downtime from 30ms to 300ms |
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Date: |
Mon, 9 Jun 2014 10:52:28 +0530 |
On (Sat) 07 Jun 2014 [02:48:14], Alexey Kardashevskiy wrote:
> On 06/06/2014 10:50 PM, Amit Shah wrote:
> > On (Thu) 27 Mar 2014 [14:57:26], Alexey Kardashevskiy wrote:
> >> The existing timeout is 30ms which on 100MB/s (1Gbit) gives us
> >> 3MB/s rate maximum. If we put some load on the guest, it is easy to
> >> get page dirtying rate too big so live migration will never complete.
> >> In the case of libvirt that means that the guest will be stopped
> >> anyway after a timeout specified in the "virsh migrate" command and
> >> this normally generates even bigger delay.
> >>
> >> This changes max_downtime to 300ms which seems to be more
> >> reasonable value.
> >>
> >> Signed-off-by: Alexey Kardashevskiy <address@hidden>
> >
> > Reviewed-by: Amit Shah <address@hidden>
>
> Cool, thanks!
>
> But what is next? The patch is > 2 months old and it is simple and
> everything but it did not make it to any tree so far :)
I'll pester Juan to get it in :-)
Amit