RE: [Xen-users] Release 0.8.0 of GPL PV Drivers for Windows

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

> > Xensource and VirtualIron claim "near bare metal performance" with
PV
> > drivers (for Windows)..
> >
> > What's wrong with these drivers?
> 
> Yeah, I'm disappointed at the open source, or at least free and
> non-proprietary solutions offered so far. I'd love to know how the
> proprietary drivers get better performance.
> 

Well... feel free to submit any performance patches you like :)

My initial testing showed much lower latency and better throughput, but
I've not done any testing in a while so performance may have dropped.

Some brief testing I just did showed I was able to copy a 200MB file
from a DomU (W2K3 running my PV drivers) to my xp laptop (1gb Ethernet
all the way) in 42 seconds, which is about 5MB/second. CPU Load was 100%
on 1 CPU.

The same operation using non-PV drivers was around 65 seconds. CPU load
was all over the place, but around 60% on one CPU and 50% on the other.

I think performance could be a little bit better than that!

Andy: Any suggestions? Do you think your last cleanup commit could have
reduced performance at all?

James

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