netdev - GRO aggregation

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Message-ID: <504F4063.9030706@mellanox.com>
Date:	Tue, 11 Sep 2012 16:45:07 +0300
From:	Shlomo Pongartz <shlomop@...lanox.com>
To:	<netdev@...r.kernel.org>
Subject: GRO aggregation

Hi,

I’m checking GRO aggregation with kernel 3.6.0-rc1+ using Intel ixgbe 
driver.
The mtu is 1500 and GRO is on and so are SG and RX checksum.
I ran iperf with default setting and monitor the receiver with tcpdump.
The tcpdump shows that the maximal aggregation is 32120 which is 21 * 1500.
In the transmitter side tcpdump shows that TSO works better (~64K).
I did a capture without GRO enabled to see if there was a difference 
between any flag
of any two consecutive packets that forced flushing but didn't find 
anything.
Is the GRO aggregation can be tuned.

Shlomo Pongratz

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