Re: [ANNOUNCE] kvm-guest-drivers-windows-2

Dor Laor
2008-05-14T16:19:28Z

On Wed, 2008-05-14 at 17:49 +0200, Tomasz Chmielewski wrote:
> Dor Laor schrieb:
>
> (...)
>
> >> - PV Windows (network driver)
> >
> > About 700Mb+-, there is currently extra copy that we need to omit.
> > Thanks for Anthony, we just have to change the driver.
> >
> >> - non-PV Windows
> >
> > What do you mean? Other fully emulated nics like e1000?
> > It does not perform as pv but depending on the guest it can do up to
> > 600Mb+-.
>
> Just generally, how Windows PV drivers help to improve network performance.
>
> So, a PV network driver can do about 700Mb/s, and an emulated NIC can do about
> 600 Mb/s, Windows guest to host?
>
> That would be about 20% improvement?
>
>

It's work in progress, doing zero copy in the guest, adding TSO, using
virtio'd tap will drastically boot performance. There is no reason the
performance won't match Linux guest.
Also I don't exactly remember the numbers but the gain in the tx pass is
grater.