RE: [Xen-users] GPLPV drivers problem

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> 
> Hello.
> I've been using Xen with some virtual machines for at least 2 years
> now. When we all gone to VT-X, the xen world was introduced to windows
> and we all enjoyed that... until we realized we needed drivers for it
> to work =) We need to thank to James Harper for his efforts in making
> the GPL PV drivers, so thanks!

Thanks

> 
> Today I installed 0.9.12-pre13 to test the performance - again the
> performance is very similar with or without the pv drivers (screenshot
> of device manager: http://uplink.lvengine.com/device.jpg )
> I've benchmarked the network with iperf between Xen virtual machines
> (pv machines, not hvm) and I get 2.5gbps ~ 3.0gbps, but with windows I
> get around 40mb/s. My kernel times are almost 100% all the time and
> disk performance is relatively slow (benchmarked with some windows
> app, hd_speed, got me around 11mb/s - not bad, but the kernel times
> are always up there... see http://uplink.lvengine.com/disk.jpg for a
> screenshot).
> 
> I use Xen 3.2.1, on a gentoo linux, so xen is compiled from source
> (for gentoo people, I have ioemu and pygrub use flags). I'm using
> kernel 2.6.21 - I think this patchset was made by Red Hat, and
> recently gentoo masked this version (or the version was already
> masked), but i needed to use the .21 kernel because .18 doesn't have
> support for one of my nic's and for the sata driver I think.
>
<snip>
>
> I've tried using ioemu: in the "hda" device and it's the same. I've
> removed the /gplpv entry from boot.ini as -pre13 doesn't need it
> anymore.
> I must be configuring something wrong, maybe it's the ACPI
> Multiprocessor PC kernel? (I installed this system a long time ago,
> before the PV drivers - changing the acpi setting now could be bad...
> - but if it must, I can try changing it...)
> Something odd is that cpu-z reports to me that the cpu has only
> 812mhz, but windows detects it's a 2.24ghz processor (single
> processor, i know the drivers have problems with smp and I don't need
> smp anyway)
> 
> I basically only run SQL server in this machine, and for a machine
> with 1.5gb of memory it runs really slow :/
> 

What OS are you using? If it's 2003 then make sure sp2 is installed.

Switching to the 'Standard PC' hal is easy enough. Switching back is a bit of a 
pain but you could just try it on an lvm snapshot.

James

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