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

[laurent.cligny at gmail.com]

Le 12/05/2011 19:36, Michael MacLeod a écrit :
> Try -rxcsum as well. I have both disabled on my domU.
I tried with -rxcsum as you mentionned, but unfortunately it changed
nothing on the performance.
>
> On Thu, May 12, 2011 at 12:53 PM, laurent.cligny at gmail.com
> <mailto:laurent.cligny at gmail.com> <laurent.cligny at gmail.com
> <mailto: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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