[FreeBSD 8.2 amd64 XENHVM] DomU terrible network performance trought NAT

[laurent.cligny at gmail.com]

Le 12/05/2011 20:22, Tobias P. Santos a écrit :
> laurent.cligny at gmail.com wrote:
>> Le 12/05/2011 17:02, Tobias P. Santos a écrit :
>>  
>>> Try this:
>>>
>>> ifconfig xn1 -txcsum
>>>
>>> Best regards,
>>> Tobias.
>>>     
>> Hello Tobias,
>>
>> Unfortunately ifconfig xn1 -txcsum didn't give me lot of result.
>> Doing this my network perf through NAT is about 7KiB/s (that is better
>> than before, but still unworkable).
>>
>> Thanks for the idea, maybe we are not that far away from the solution.
>>
>>   
> We had a problem where traffic between VMs was too slow (about 5Mbps
> on a Gigabit network) and disabling TX checksum solved the problem
> (actually, speed increased to more than 1Gbps).
> Your problem is different as you have a nice throughput between VMs on
> xn1, sorry that I missed that on my first message.
>
> Did you try to transfer data from something connected to xn0 to one of
> yours DomU servers connected to xn1 without NAT?
> You also mentioned pf. Did you make any test using natd or anything else?
> Something tells me that's not a nic problem, but that's just a guess.
I already tried setup with natd, as I found on the list archives that PF
can pose problems with XENHVM kernels, but the network perfomance was
the same.
>
> Anyway, on the coming weeks I will have to set up a similar
> environment to yours, so maybe I'll face the same problem (although we
> use natd daemon instead of pf).
>
> Good luck!
I think I will keep my Linux PV VM to do NAT, as it is the only thing on
my Xen setup that cause problems for now. With that I will still be able
to work with FreeBSD for the backend servers.
>
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