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Re: [Xen-users] SOLVED - Poor Windows 2003 + GPLPV performance compared to VMWare

On 19/09/12 22:55, James Harper wrote:
>> Excellent news, the issue is completely resolved, and in fact, performance is
>> now better than vmware, and better than the old original physical box pre-
>> virtualisation. The entire task now completed in 30 minutes, the previous
>> best was 40 minutes (ie, prior to xen).
> I wasn't expecting it to be faster. Are you comparing 2003sp1 under VMWare 
> with 2003sp2 under Xen?
Yes, comparing SP1 under VMWare to SP2 under Xen. (So not entirely fair,
but at the end of the day, it looks good for me and Xen :)
>> I made note before that I was getting around 2500 transactions / sec, and 
>> this
>> was too slow, just now, I'm getting around 7900 transactions / sec. The only
>> change was the installation of Windows 2003 Service Pack 2.
> Microsoft updated Windows 2003 with SP2 to remove the use of the TPR 
> register, which was a big performance hit on a virtual system. You can add 
> /PATCHTPR to boot.ini to patch the windows kernel to use an alternate method 
> of TPR access under AMD systems, and to cache reads of TPR under Intel 
> systems, but I thought the xen guys had implemented their own acceleration of 
> this in xen itself?
Are you saying the SP1 with the /PATCHTPR will work well (not that I'm
interested in this, but just interested), or are you saying the with SP2
you can use /PATCHTPR to improve performance even further (this would be


Adam Goryachev
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