[Xen-users] Windows PV drivers destroying performance

[G Crowe <gcxenlist@xxxxxxxxxx>]

I installed the PV drivers in some windows PVs as I thought it would 
improve performance, but the systems then became painfully slow to use.
I ran some tests on hard disc performance on a newly installed Win7 32 
bit system before and after installing the PV drivers from univention.de 
(version 0.11.0.373) as the other sites appear to be offline. The host 
machine is running Fedora 21 with kernel 3.19.3.
Without the PV drivers (with QEMU hardware) hard disc performance was 
4409 I/O per second and 9.03Mbps.
With the PV drivers installed this dropped to 207 I/O per second and 
0.43Mbps.
Without the PV drivers, the remote desktop screen would refresh almost 
instantly, but with the PV drivers it could take up to 10 seconds just 
to refresh the screen.
I don't understand this, as I though that the sole purpose of the PV 
drivers was to improve I/O performance, yet they have made the system so 
slow that it is virtually unusable.
Am I doing something wrong here?


Thanks

GC

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