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

[laurent.cligny at gmail.com]

Le 12/05/2011 20:20, Guillaume Seigneuret a écrit :
> I think you should try totally disable the window sizing both parts to
> isolate it doesn't come from here :
> On your FreeBSD VM : sysctl net.inet.tcp.rfc1323=0
> On your Linux box : sysctl net.ipv4.tcp_window_scaling=0
I set net.inet.tcp.rfc1323=0 to VM Nic and the two NAT VM Nics, but it
changed nothing on the network perf.
>
> Then if the rate is hugely better, try some settings to increase the
> compatibility.
> You can also try an *iperf *test with TCP and UDP packets to see if
> the behavior is generalized, and see what latency you have both part
> of the network.
Iperf is hanging on the test since there is almost not network
troughput. I waited 30min before I cancelled it.
>
> Cordialement,
>
> *Guillaume Seigneuret* 
>
>
>
> **Network and System Security Architect*
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>
> 2011/5/12 Michael MacLeod <mikemacleod at gmail.com
> <mailto:mikemacleod at gmail.com>>
>
>     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
>     <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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