Re: Performance issue

[Vadim Rozenfeld <vrozenfe@redhat.com>]

On Tuesday, November 27, 2012 04:54:47 PM Gleb Natapov wrote:
> On Tue, Nov 27, 2012 at 02:29:20PM +0200, George-Cristian Bîrzan wrote:
> > On Tue, Nov 27, 2012 at 2:20 PM, Gleb Natapov <gleb@redhat.com> wrote:
> > > On Mon, Nov 26, 2012 at 09:31:19PM +0200, George-Cristian Bîrzan wrote:
> > >> On Sun, Nov 25, 2012 at 6:17 PM, George-Cristian Bîrzan <gc@birzan.org> 
wrote:
> > >> > On Sun, Nov 25, 2012 at 5:19 PM, Gleb Natapov <gleb@redhat.com> 
wrote:
> > >> >> What Windows is this? Can you try changing "-cpu host" to "-cpu
> > >> >> host,+hv_relaxed"?
> > >> > 
> > >> > This is on Windows Server 2008 R2 (sorry, forgot to mention that I
> > >> > guess), and I can try it tomorrow (US time), as getting a stream my
> > >> > way depends on complicated stuff. I will though, and let you know
> > >> > how it goes.
> > >> 
> > >> I changed that, no difference.
> > > 
> > > Heh, I forgot that the part that should make difference is not yet
> > > upstream :(
> > 
> > We can try recompiling kvm/qemu with some patches, if that'd help. At
> > this point, anything is on the table except changing Windows and the
> > hardware :-)
> 
> Vadim do you have Hyper-v reference timer patches for KVM to try?
I have some code which do both reference time and invariant TSC but it
will not work after migration. I will send it later today.
Vadim.
> 
> > Also, it might be that the software doing the actual work is not well
> > written, but even so...
> > 
> > --
> > George-Cristian Bîrzan
> 
> --
> 			Gleb.