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

[Michael MacLeod]

Try -rxcsum as well. I have both disabled on my domU.

On Thu, May 12, 2011 at 12:53 PM, laurent.cligny at gmail.com <
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.
>
> >
> >
> > 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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