Re: [Xen-users] GPL PV drivers for Windows 0.9.11-pre12

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Tue, Aug 26, 2008 at 09:04:23PM +1000, James Harper wrote:
> > While these numbers seem to be true for the RX/TX tests between domU
> <->
> > dom0, they don't apply to the domU <-> other physical node on lan. The
> > RX is fine, on my 100mbit lan I get about 94 / 95mbit. But the TX is
> > very poor: only 18-20mbit. This has been since all versions I've
> tested
> > before, but of course hoped this one would make the difference. I've
> > compared the results with a Linux domU PV, which does perform as
> > expected (94-95mbit for both RX/TX).
> > 
> 
> Thanks for the feedback. I wonder if Large Send Offload is causing
> problems somewhere... Can you try turning off Large Send Offload and
> report the results?
> 
> I am looking at why RX performance is about 1/3 the speed of TX, but am
> surprised that TX is so poor when sending to a physical network...
> 
> Maybe wait about 20 minutes before testing as I'll upload a -pre13, as
> -pre12 would sometimes (always?) crash when changing those network
> settings.
> 

That reminded me of jumbo frames support.. do you know if anyone has tested
changing the MTU on Windows and actually using jumbo frames with gplpv drivers? 

Discussion about jumbo frames earlier:
http://lists.xensource.com/archives/html/xen-devel/2008-06/msg00519.html

-- Pasi

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