Re: [Xen-users] Slow Windows XP 32-bit

[Peter Milesson <miles@xxxxxxxx>]

Hi Mitch,

It was exactly that post that put me on track (seems to occur in quite a 
few lists). Now the 32-bit XPs don't seem slower than their bare metal 
predecessors.
Next thing is to tweak network performance. It seems sufficient so far, 
but it never hurts to take it to the edge.
Best regards,

Peter

On 2013-09-26 18:07, mitch@xxxxxxxxxxxx wrote:
> This thread gives a little more context (for those curious like I was ;-)
> http://xen.1045712.n5.nabble.com/Windows-domU-opitimization-td2576122.html
> Seems to affect 2003 before sp2 as well.
>
> Thanks!
>
> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxx [mailto:xen-users-bounces@xxxxxxxxxxxxx] 
> On Behalf Of Peter Milesson
> Sent: September 26, 2013 7:59 AM
> To: xen-users
> Subject: Re: [Xen-users] Slow Windows XP 32-bit
>
> OK, I did comb through the web a bit more, and found something that made a HUGE 
> difference:
>
> I added the parameter /patchtpr to the operating system boot line in Windows XP 
> boot.ini
>
> Now I'm pleased :-)
>
> I wish everybody a nice day,
>
> Peter
>
>
> On 2013-09-26 09:55, Peter Milesson wrote:
> > Hi folks,
> >
> > I've been using Xen hypervisor for a couple of years. What beats me
> > is, that Windows XP 32-bit performance is quite slow, and there seems
> > to be no improvements with Xen 4.3.0, compared to Xen 4.1.0. I'm using
> > the GPLPV drivers with Windows, I've tried the experimental 0.11.0.404
> > (installation problems), but it's obvious, the problem isn't with the
> > GPLPV drivers, as the performance didn't improve a bit.
> >
> > Yesterday, I upgraded a system that previously had Xen 4.2.0
> > hypervisor, and a standard Linux kernel 3.7.1 with all Xen-stuff
> > (backends, frontends, etc) activated. I replaced it with a similar
> > Linux kernel 3.10.12 and Xen 4.3.0. I've also got another system with
> > about the same setup, though different hardware. In both systems, the
> > Windows XP 32-bit performance is quite below expectations. On the
> > contrary, the performance of Windows XP 64-bit improved considerably,
> > when ported to Xen from an older PC, and it's really shining.
> >
> > The virtual disks are always LVM-backed, so the issues are not there.
> >
> > Dom0 is using 2 exclusive pinned vcpus in all the machines There's 2GB
> > of RAM set aside for Dom0 in all setups, which is more than sufficient
> > Dom0 has got weight 6000, and all DomU have got default weight 256 in
> > the scheduler
> > Dom0 normally uses about 10-20% cpu
> > Every DomU is using 2 vcpus, sharing the available vcpus with other
> > machines DomUs mostly have got 1GB of RAM
> >
> > I've tried different tweaks, parameter settings, and I don't know
> > what, and I'd be very grateful for some good advice where to improve
> > the situation.
> >
> > Best regards,
> >
> > Peter
> >
> >
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