netdev - GRO aggregation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

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

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html