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Re: [Xen-users] Windows Performance Monitor on a Win2003R2 DomU

To: "Robinson, Eric" <eric.robinson@xxxxxxxxx>
Subject: Re: [Xen-users] Windows Performance Monitor on a Win2003R2 DomU
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Fri, 8 May 2009 10:17:36 +0300
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On Thu, May 07, 2009 at 09:13:42PM -0700, Robinson, Eric wrote:
> I'm using Qemu emulated drivers. I am under the impression that 
> paravirtualized drivers are not an option for Windows guests.

You should try Windows Xen GPLPV drivers. They'll have a lot better performance 
than the
Qemu emulated devices.

And please don't top-post..

-- Pasi

> --
> Eric Robinson
> -----Original Message-----
> From: Pasi Kärkkäinen [mailto:pasik@xxxxxx] 
> Sent: Thursday, May 07, 2009 2:56 AM
> To: Robinson, Eric
> Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] Windows Performance Monitor on a Win2003R2 DomU
> On Wed, May 06, 2009 at 01:50:30PM -0700, Robinson, Eric wrote:
> > I have 3 Windows terminal servers. The two physical servers have 
> > average disk queue lengths around 1-2, which is normal for a RAID 1 
> > server. The third Windows terminal server is a Xen DomU. When I run 
> > perfmon on it, average disk queue lengths are 20,000+. What the heck 
> > accounts for the difference? That number has to be spurious. There's 
> > no way the disk queue could really be that high.
> > 
> Are you using Qemu emulated disk devices/drivers (default), or optimized
> (paravirtualized) drivers?
> -- Pasi

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