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Re: [Xen-users] performance of pv drivers for windows

To: Sebastian Reitenbach <sebastia@xxxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] performance of pv drivers for windows
From: Alexander Piavlo <piavka@xxxxxxxxxxxx>
Date: Mon, 22 Sep 2008 12:57:39 +0300
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Sebastian Reitenbach wrote:
Hello everybody,

I tried to measure the performance of the available drivers for windows as a HVM guest. I used the gplpv drivers 0.9.11-pre17, the PV drivers from Novell, and the drivers from Citrix XenSource with the XenServer 5.

The Novell and gplpv drivers were more or less at the same speed, for both, network and disk performance. The disk performance was about 10MB/s reading and writing sequentially, and about 1-1.5MB/s for reading and writing randomly.
The network speed was about 10-12MB/s, via a GigaBit line.

The Xensource drivers made at least about 30MB/s reading and writing sequentially, but for reading and writing randomly, it was also only lousy 1.5MB/s.
1.5MB/s for random write access is not lousy , if you perform random write test in dom0 or on native non xen kernel
you'll also get  1.5MB/s
Via network, over the GigaBit line, with the xensource drivers, the speed was about 78 MB/s.

The Windows system was a XP SP2.
hdparm on the dom0 gives about 60MB/s.
The network test was an ftp transfer, just downloading a 500MB file, without writing it to disk, writing to nul. The same in the dom0, writing the file to /dev/null gave me 112MB/s.

So I am wondering, what are the expected speed gains for the gplpv drivers?
Is the performance of the drivers bettter with different windows versions, e.g. windows server 2003?

kind regards

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