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Re: [Xen-users] Release 0.8.0 of GPL PV Drivers for Windows
- To: "Pasi Kärkkäinen" <pasik@xxxxxx>
- From: "Emre ERENOGLU" <erenoglu@xxxxxxxxx>
- Date: Wed, 27 Feb 2008 23:54:06 +0100
- Cc: xen-users@xxxxxxxxxxxxxxxxxxx, jim burns <jim_burn@xxxxxxxxxxxxx>
- Delivery-date: Wed, 27 Feb 2008 14:54:38 -0800
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Hi,
Just did two other tests. Simple ones again :)
1) I installed a high performance copy handler utility. Then selected 20 meg buffer size, then tried to copy a 700 MB file from the dom0. Checked windows task manager for network utilization. It reports 100% CPU usage (all kernel) and 2% utilization on network interface (reports gigabit eth).
2) To avoid disk impact on measurement, I opened a cmd prompt, and did the same copy, but this time copying to the NUL device.
z:\>copy image.iso NUL
Same, 100% CPU utilization, 2% network bandwidth utilization, ~1000%2=20 Mbps.
My PV drivers version is 0.8.0
Emre
On Wed, Feb 27, 2008 at 12:09 PM, Pasi Kärkkäinen < pasik@xxxxxx> wrote:
On Wed, Feb 27, 2008 at 05:43:39AM -0500, jim burns wrote:
> On Wednesday 27 February 2008 05:06:00 am Emre ERENOGLU wrote:
> > Yesterday, I tried to copy a file around 700 MB from Dom0 to DomU, and got
> > similar results, it was around 2 MByte/sec.
> >
> > Seemed pretty slow to me.
>
> But at least it's not a couple of 100 kBps. Still a lot of overhead in hvm,
> intercepting privileged instructions.
>
These 2 MByte/sec result sounds really poor..
Xensource and VirtualIron claim "near bare metal performance" with PV
drivers (for Windows)..
What's wrong with these drivers?
Or is the test somehow wrong? How *exactly* do you measure the performance?
What's the *exact* setup and configuration?
-- Pasi
--
Emre Erenoglu
erenoglu@xxxxxxxxx
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