netdev - TI CPSW Ethernet Tx performance regression

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <1389790129-5721-1-git-send-email-mugunthanvnm@ti.com>
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
--
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