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

[Joost van den Broek <jvandenbroek@xxxxxxxxx>]

James Harper schreef:
> > 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.
>
> In the meantime, can you please send me the output of a xenstore-ls
> /local/domain/<id>/device/vif? Mine looks like this:
>
> 0 = ""
>  state = "4"
>  backend-id = "0"
>  backend = "/local/domain/0/backend/vif/94/0"
>  tx-ring-ref = "16093"
>  rx-ring-ref = "16092"
>  event-channel = "10"
>  feature-no-csum-offload = "0"
>  feature-sg = "1"
>  feature-gso-tcpv4 = "1"
>  request-rx-copy = "1"
>  feature-rx-notify = "1"
>
> Note the 'backend =' line above? Also send me the output of a
> xenstore-ls of that, eg in my case 'xenstore-ls
> /local/domain/0/backend/vif/94/0'
>
> Thanks
>
> James
>
>   
With Large Send Offload disabled, it indeed utilizes it's max bandwidth! 
Both RX/TX are about 94mbit when testing at 100mbit lan, so that's a 
perfect result! I first updated to pre13 before I tried this, so can't 
tell if it had to do with your last version. However, I know I did test 
it with large send offload disabled before, but not with one of the 
latest pre's. Do you still need the output requested?
Joost

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