[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-users] Windows PV drivers destroying performance
On Fri, 2015-07-24 at 22:14 +1000, G Crowe wrote: > 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, Your expectation here is correct. > yet they have made the system so > slow that it is virtually unusable. > > Am I doing something wrong here? It seems unlikely, I don't think there is much you can have done wrong, it's supposed to just work ;-) more likely some sort of bad interaction between some (possibly buggy) component and another. I don't know much about the Windows PV drivers, so hopefully someone else can chip in with some tips/knowledge. Seeing your guest cfg file and any relevant logs from /var/log/xen might have some sort of clue. Ian. _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxx http://lists.xen.org/xen-users
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