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

[Keith Coleman <list.keith@xxxxxxxxxxx>]

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.


Keith Coleman

Attachment: comparison-iops-3.png
Description: PNG image

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