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Subject: Re: [OMPI users] TCP Bandwidth
From: Steve Wise (swise_at_[hidden])
Date: 2008-08-17 10:55:54

Andy Georgi wrote:
> Hello again ;),
> after getting acceptable latency on our Chelsio S320E-CXA adapters we
> now want to check if we can
> also tune the bandwidth. On TCP level (measured via iperf) we get 1.15
> GB/s, on MPI level (measured
> via MPI-Ping-Pong) just 930 MB/s. We already set btl_tcp_sndbuf and
> btl_tcp_rcvbuf to get these
> value. Are there any other parameters which should be in-/decreased to
> get a higher bandwidth?
> If someone has already experiences in it, any help is welcome!
> Thanks and best regards
> Andy
Are you using Chelsio's TOE drivers? Or just a driver from the distro?