Re: [Qemu-devel] [Bug 1100843] Re: Live Migration Causes Performance Issues

[Peter Lieven]

On 07.10.2013 11:37, Paolo Bonzini wrote:
> Il 07/10/2013 08:38, Peter Lieven ha scritto:
> > On 06.10.2013 15:57, Zhang Haoyu wrote:
> > > > >From my testing this has been fixed in the saucy version (1.5.0) of
> > > qemu. It is fixed by this patch:
> > > > f1c72795af573b24a7da5eb52375c9aba8a37972
> > > >
> > > > However later in the history this commit was reverted, and again broke
> > > this. The other commit that fixes this is:
> > > > 211ea74022f51164a7729030b28eec90b6c99a08
> > > See below post,please.
> > > https://lists.gnu.org/archive/html/qemu-devel/2013-08/msg05062.html
> > I would still like to fix qemu to not load roms etc. if we set up a
> > migration target. In this case
> > we could drop the madvise, skip the checking for zero pages and also
> > could avoid sending
> > zero pages at all. It would be the cleanest solution.
> It's in general not easy to do this if you take non-x86 targets into
> account.
What about the dirty way to zero out all non zero pages at the beginning of
ram_load?

Peter