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

  • To: 'Peter Milesson' <miles@xxxxxxxx>, xen-users <xen-users@xxxxxxxxxxxxx>
  • From: "mitch@xxxxxxxxxxxx" <mitch@xxxxxxxxxxxx>
  • Date: Thu, 26 Sep 2013 16:07:51 +0000
  • Accept-language: en-CA, en-US
  • Delivery-date: Thu, 26 Sep 2013 16:08:55 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>
  • Thread-index: AQHOuo5QXSSGsd6+aE2HSSqT09Q4OpnYkjgA//+c8qA=
  • Thread-topic: [Xen-users] Slow Windows XP 32-bit

This thread gives a little more context (for those curious like I was ;-)
Seems to affect 2003 before sp2 as well.


-----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 

I added the parameter /patchtpr to the operating system boot line in Windows XP 

Now I'm pleased :-)

I wish everybody a nice day,


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 
> (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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> Xen-users@xxxxxxxxxxxxx
> http://lists.xen.org/xen-users

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