netdev - Performance in stmmac

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Date:   Tue, 7 Feb 2017 19:33:52 +0000
From:   Joao Pinto <Joao.Pinto@...opsys.com>
To:     <niklas.cassel@...s.com>,
        Giuseppe CAVALLARO <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>
CC:     netdev <netdev@...r.kernel.org>
Subject: Performance in stmmac

Hi to all,

I finished implementing the multi-queue / multi-channel in stmmac and I am now
making some tests.

The mechanism is working properly, but the performance could be better
(~440Mb/s) :). For measuring I am using iperf:

synopsys@...2ipk1:~$ iperf -c 192.168.0.3 --port 5001 -t 20 -i 5
------------------------------------------------------------
Client connecting to 192.168.0.3, TCP port 5001
TCP window size: 85.0 KByte (default)
------------------------------------------------------------
[  3] local 192.168.0.2 port 34272 connected with 192.168.0.3 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0- 5.0 sec   260 MBytes   436 Mbits/sec
[  3]  5.0-10.0 sec   262 MBytes   440 Mbits/sec
[  3] 10.0-15.0 sec   262 MBytes   440 Mbits/sec
[  3] 15.0-20.0 sec   257 MBytes   431 Mbits/sec
[  3]  0.0-20.0 sec  1.02 GBytes   437 Mbits/sec

I am seeing tx being performed in all queues, but rx is just being routed to
queue 0. The reason why only queue 0 is processing the packets is because I am
using priority tagged routing for now and iperf is not capable of producing
priority tagged traffic.

I am sending you this e-mail in order to know if you could suggest me a tool to
generate priority tagged traffic and if you have experience in tweaking stmmac
to improve performance.

Thanks,
Joao