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Re: Au1550 ethernet throughput low

To: linux-mips <linux-mips@linux-mips.org>
Subject: Re: Au1550 ethernet throughput low
From: jaypee@hotpop.com
Date: Thu, 14 Jul 2005 15:15:42 +0000
In-reply-to: <1121353347.10582.3.camel@orionlinux.starfleet.com> (from matej.kupljen@ultra.si on Thu Jul 14 16:02:26 2005)
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <1121270402l.7656l.3l@cavan> <1121353347.10582.3.camel@orionlinux.starfleet.com>
Sender: linux-mips-bounce@linux-mips.org
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I've got a au1550 board based largely on the pb1550. The ethernet
throughput is ~66Mbps using the 2.6 kernel. This also consumes a
lot of cpu cycles to send.

I put a test into YAMON and I can get full line rate out no problem.

I think this narrows it down to a problem with the kernel or my port
of it.

The actual au1000_eth driver doesn't do much work other than copy a packet into cache aligned buffer. It must be more to do with the scheduling of sending a new packet. tx_ack.

The kernel I'm using is a snapshot linux-mips CVS of 2.6.11-rc5.
Can anyone tell me if there improvements/fixes to this area since then?

Clem sent me the output of a test. In which he is getting 11MBs
I'm assuming the B is bytes in which case that is as near line rate as
dammit.

Clem you said were using 2.6.11 was that a kernel.org kernel or one
from linux-mips.org?

thnks for running the test clem.


- -- JP
mailto:jaypee@hotpop.com
http://www.jaypee.org.uk
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