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

[Sebastian Reitenbach <sebastia@xxxxxxxxxxxxxxxxxxxx>]

On Monday September 22 2008 11:57:39 Alexander Piavlo wrote:
> 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
Hm, ok, but without any PV drivers, I got about 7MB/sec. at least for writing 
to the disk.
Therefore I was wondering.
https://www.l00-bugdead-prods.de/XenBench/random_write_without_pv_driver.htm


kind regards
Sebastian


>
> > 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
> > Sebastian
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users



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