RE: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimization

From	"Li, Liang Z" <liang.z.li@intel.com>
Newsgroups	linux.kernel
Subject	RE: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimization
Date	2016-03-08 15:20 +0100
Message-ID	<raqEq-1XQ-13@gated-at.bofh.it> (permalink)
References	(6 earlier) <r8UwZ-4Id-63@gated-at.bofh.it> <r8UZX-57O-11@gated-at.bofh.it> <r8Vjk-5hs-31@gated-at.bofh.it> <r8ZGi-7O-5@gated-at.bofh.it> <raquL-1Uq-53@gated-at.bofh.it>
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> On Fri, Mar 04, 2016 at 03:13:03PM +0000, Li, Liang Z wrote:
> > > > Maybe I am not clear enough.
> > > >
> > > > I mean if we inflate balloon before live migration, for a 8GB
> > > > guest, it takes
> > > about 5 Seconds for the inflating operation to finish.
> > >
> > > And these 5 seconds are spent where?
> > >
> >
> > The time is spent on allocating the pages and send the allocated pages
> > pfns to QEMU through virtio.
> 
> What if we skip allocating pages but use the existing interface to send pfns to
> QEMU?
>

I think it will be much faster, allocating pages is the main reason for the long time of the operation.
Experiment is needed to get the exact time spend on sending the pfns.

Liang

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Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration  optimization "Michael S. Tsirkin" <mst@redhat.com> - 2016-03-04 10:50 +0100
  RE: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration  optimization "Li, Liang Z" <liang.z.li@intel.com> - 2016-03-04 11:20 +0100
    Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration  optimization "Michael S. Tsirkin" <mst@redhat.com> - 2016-03-04 11:40 +0100
      RE: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration  optimization "Li, Liang Z" <liang.z.li@intel.com> - 2016-03-04 16:20 +0100
        Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration  optimization "Michael S. Tsirkin" <mst@redhat.com> - 2016-03-08 15:10 +0100
          RE: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration  optimization "Li, Liang Z" <liang.z.li@intel.com> - 2016-03-08 15:20 +0100

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