RE: GRO aggregation

From: Marcelo Ricardo Leitner [mleitner@redhat.com]
Sent: Tuesday, September 11, 2012 9:20 PM
To: Shlomo Pongratz
Cc: netdev@vger.kernel.org
Subject: Re: GRO aggregation

On 09/11/2012 10:45 AM, Shlomo Pongartz wrote:

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.

Hi Shlomo,

Have you tried tuning coalescing parameters?

Marcelo


Hi Marcelo

I didn't play with interrupts coalescing.
Do you suggest to increase the value?

Shlomo