netdev - Re: 100Mbit ethernet performance on embedded devices

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Date:	Wed, 2 Sep 2009 15:09:05 +1000
From:	Aras Vaichas <arasv@...ellan-technology.com>
To:	Johannes Stezenbach <js@...21.net>
Cc:	linux-embedded@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: 100Mbit ethernet performance on embedded devices

On Thu, Aug 20, 2009 at 12:50 AM, Johannes Stezenbach <js@...21.net> wrote:
>
> Hi,
>
> a while ago I was working on a SoC with 200MHz ARM926EJ-S CPU
> and integrated 100Mbit ethernet core, connected on internal
> (fast) memory bus, with DMA.  With iperf I measured:
>
>  TCP RX ~70Mbit/sec  (iperf -s on SoC, iperf -c on destop PC)
>  TCP TX ~56Mbit/sec  (iperf -s on destop PC, iperf -c o SoC)
>
> What I'm interested in are some numbers for similar hardware,
> to find out if my hardware and/or ethernet driver can be improved,
> or if the CPU will always be the limiting factor.
> I'd also be interested to know if hardware checksumming
> support would improve throughput noticably in such a system,
> or if it is only useful for 1Gbit and above.
>
> Did anyone actually manage to get close to 100Mbit/sec
> with similar CPU resources?

No, but I can share results.

AT91RM9200 (ARM920T), 180MHz
Davicom 9161 PHY
Linux 2.6.26.3

CONFIG_NETFILTER=y
CONFIG_NETFILTER_ADVANCED=y

# uptime; iperf -s; uptime
 00:07:33 up 7 min, load average: 0.02, 0.10, 0.07
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[  4] local 169.254.0.235 port 5001 connected with 169.254.0.2 port 50762
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-10.0 sec  58.6 MBytes  49.1 Mbits/sec

 00:07:46 up 7 min, load average: 0.17, 0.13, 0.08
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