[Cerowrt-devel] Fwd: tcp wifi upload performance and lots of ACKs

Dave Taht dave.taht at gmail.com
Mon Jun 4 14:47:34 EDT 2012

I was getting a bit more than this in the general case with the last
cut of cerowrt.

what are y'all getting with a good (300Mbit) link and various wifi cards?

---------- Forwarded message ----------
From: Ben Greear <greearb at candelatech.com>
Date: Mon, Jun 4, 2012 at 7:29 PM
Subject: tcp wifi upload performance and lots of ACKs
To: netdev <netdev at vger.kernel.org>

I'm going some TCP performance testing on wifi -> LAN interface
connections.  With
UDP, we can get around 250Mbps of payload throughput.  With TCP, max
is about 80Mbps.

I think the problem is that there are way too many ACK packets, and
traffic on wifi interfaces really slows things down.  (About 7000 pkts
per second in
upload direction, 2000 pps download.  And the vast majority of the download pkts
are 66 byte ACK pkts from what I can tell.)

Kernel is 3.3.7+

Anyone know of any tuning parameters that would let the receiving socket wait a
bit longer and send more ACK data in fewer packets?

Packet traces and other info available if anyone wants to take a look.


Ben Greear <greearb at candelatech.com>
Candela Technologies Inc  http://www.candelatech.com

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Dave Täht
SKYPE: davetaht

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