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

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Message-ID: <1328259640.2480.43.camel@edumazet-laptop>
Date:	Fri, 03 Feb 2012 10:00:40 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Hefty, Sean" <sean.hefty@...el.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

Le vendredi 03 février 2012 à 07:18 +0000, Hefty, Sean a écrit :
> > 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)



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