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.

>
>
> Laurent Cligny wrote:
>> Hello all,
>>
>> I want to setup a FreeBSD DomU VM as a network NAT gateway in order to
>> provide Internet access to other FreeBSD and Linux DomU VMs.
>> My Dom0 is Xen Cloud Platform 1.0 on a Dell Poweredge 210 with 8 cores,
>> 16GiB RAM and one NIC.
>>
>> All FreeBSD VM are 8.2 amd64 with XENHVM kernel anf the Linux VM is a
>> Paravirtualized Debian amd64.
>>
>> The NAT gateway is a two-NIC box, with one (xn0) configured with a
>> public Internet address and the other (xn1) configured with a class A
>> private address (10.0.0.254).
>> The Internet traffic is very good from my FreeBSD NAT gateway to the
>> Internet (~ 50MiB/s) and also between other VMs on the private network
>> (~ 70MiB/s trough scp) after applying the patch here
>> (http://www.mail-archive.com/freebsd-xen@freebsd.org/msg00855.html)
>> fixing the "too many frags" problem.
>>
>> Here is a schema of my setup with the observed net speed on it:
>>
>> ----------         ---------------         ----------------------
>> |Internet|---xn0---|FBSD DomU NAT|---xn1---|FBSD and Linux DomUs|
>> ----------         ---------------         ----------------------
>>           <------->               <------->
>>            50MiB/s                 70MiB/s
>>
>>           <------------------------------->
>>            0KiB/s <network speed< 5 KiB/s
>>
>> [...]
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