netdev - RE: [PATCH 2/2] IB/ipoib: fix GRO merge failure for IPoIB originated TCP streams

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Date:	Fri, 3 Feb 2012 20:24:00 +0000
From:	"Hefty, Sean" <sean.hefty@...el.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Or Gerlitz <ogerlitz@...lanox.com>,
	linux-rdma <linux-rdma@...r.kernel.org>,
	Shlomo Pongratz <shlomop@...lanox.com>,
	Roland Dreier <roland@...nel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: RE: [PATCH 2/2] IB/ipoib: fix GRO merge failure for IPoIB
 originated TCP streams

> > > Hi Sean, this is the patch posted earlier by Eric enhanced to
> > > have IPoIB to set gro_mac_header_len to the ipoib header len, does
> > > it make things to work okay for you?
> >
> > I ran a quick test.  It helps some, but the performance for streaming
> packets in one direction is still only 0.11 Gbps.  It should be closer to 10-
> 15 Gbps for ipoib on my systems.
> >
> > - Sean
> 
> Hmm... a tcpdump would help to understand what is going on (for example
> if GRO kicks in)

I should stop trying to apply patches so late.  I must have done something wrong with my quick test.  Re-applying the patch on 3.2, the ipoib UD performance looks okay to me with Eric's patch.  Sorry about the flub.

- Sean