netdev - RE: GRO aggregation

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Date:	Tue, 11 Sep 2012 18:41:49 +0000
From:	Shlomo Pongratz <shlomop@...lanox.com>
To:	"mleitner@...hat.com" <mleitner@...hat.com>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: GRO aggregation

From: Marcelo Ricardo Leitner [mleitner@...hat.com]
Sent: Tuesday, September 11, 2012 9:20 PM
To: Shlomo Pongratz
Cc: netdev@...r.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--
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