RE: [Xen-users] Windows domU opitimization

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> 
> Hello,
> 
> I'm new to Xen and after properly configured a couple of Linux based
> VMs, I'm giving a try to a Windows XP domU.
> 
> Installation is going just fine, network performances are pretty good
> after installing the gplpv driver (1Gb link properly recognized), but
> opening a session and usage is very slow through RDP.

In your boot.ini file, add /PATCHTPR to the boot line, eg:

multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP
Professional" /noexecute=optin /fastdetect /patchtpr

This may give you some speed increase depending on the CPU you are
using.

/PATCHTPR activates a feature in gplpv that patches the windows kernel
to avoid using a certain hardware register (Task PRiority). Access to
the register is very slow, and it is accessed very frequently.

James

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