Re: [Xen-devel] windows domU disk performance graph comparing hvm vs stubdom vs pv drivers

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Fri, 19 Feb 2010, Keith Coleman wrote:
> I am posting this to xen-devel instead of -users because it paints an
> incomplete picture that shouldn't be the basis for deciding how to run
> production systems.
> 
> This graph shows the performance under a webserver disk IO workload at
> different queue depths. It compares the 4 main IO methods for windows
> guests that will be available in the upcoming xen 4.0.0 and 3.4.3
> releases: pure HVM, stub domains, gplpv drivers, and xcp winpv
> drivers.
> 
> The gplpv and xcp winpv drivers have comparable performance with gplpv
> being slightly faster. Both pv drivers are considerably faster than
> pure hvm or stub domains. Stub domain performance was about even with
> HVM which is lower than we were expecting. We tried a different cpu
> pinning in "Stubdom B" with little impact.
> 

What disk backend are you using?
If you are using a raw file, it is worth trying with an lvm volume as well.
Also are using blktap or blktap2?


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