[netperf-talk] testing two 10G networkcards on same host

[Coyne, Kate]

Also,
 You should make sure your overall pci bus speed can go(support) to
10Gb. Many of the newer Servers can but you want to be sure, as many of
the past generation did not. 
Cheers,
Kate

-----Original Message-----
From: netperf-talk-bounces at netperf.org
[mailto:netperf-talk-bounces at netperf.org] On Behalf Of Andrew Gallatin
Sent: Thursday, September 10, 2009 8:37 AM
To: Alan Woods
Cc: netperf-talk at netperf.org
Subject: Re: [netperf-talk] testing two 10G networkcards on same host

Alan Woods wrote:
> Hi Rick
> I am testing two  10G network cards on the same machine, I want to run
netserver so it only looks at one card and net perf so it transmits
through the other card. When I run it it runs ok but the results show
that it must be just looping through the kernel and not transmitting
through physical interface. As I only have one fast machine to do the
testing is it possible to force netperf to transmitt through one
physical interface to the second card interface.
>  I have card 1 on 10.0.2.2 and card 2 on 10.0.2.3
> 
> netserver -L 10.0.2.2, AF_INET -4
> netperf -H 10.0.2.3 -L 10.0.2.3,AF_INET -4
> 
> 
> Is it possible to do the test this way or does the server have to be
on a
> seperate machine

Most OSes enable software loopback when both sides of a connection
are on the same host.  If you're running Linux, then there's a
kernel patch to disable this, and allow the traffic to flow
across the NICs.  See:

http://www.ssi.bg/~ja/#loop

I've never tried it myself, but it was used successfully
by one of our customers to validate a dual-port 10G NIC.

Cheers,

Drew
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