netdev - TI CPSW Ethernet Tx performance regression

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Date:	Wed, 15 Jan 2014 18:18:49 +0530
From:	Mugunthan V N <mugunthanvnm@...com>
To:	<netdev@...r.kernel.org>
CC:	Mugunthan V N <mugunthanvnm@...com>
Subject: TI CPSW Ethernet Tx performance regression

Hi

I am seeing a performance regression with CPSW driver on AM335x EVM. AM335x EVM
CPSW has 3.2 kernel support [1] and Mainline support from 3.7. When I am
comparing the performance between 3.2 and 3.13-rc4. TCP receive performance of
CPSW between 3.2 and 3.13-rc4 is same (~180Mbps) but TCP Transmit performance
is poor comparing to 3.2 kernel. In 3.2 kernel is it *256Mbps* and in 3.13-rc4
it is *70Mbps*

Iperf version is *iperf version 2.0.5 (08 Jul 2010) pthreads* on both PC and EVM

On UDP transmit also performance is down comparing to 3.2 kernel. In 3.2 it is
196Mbps for 200Mbps band width and in 3.13-rc4 it is 92Mbps

Can someone point me out where can I look for improving Tx performance. I also
checked whether there is Tx descriptor over flow and there is none. I have
tries 3.11 and some older kernel, all are giving ~75Mbps Transmit performance
only.

[1] - http://arago-project.org/git/projects/?p=linux-am33x.git;a=summary

Regards
Mugunthan V N
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