RE: Debugging Network Performance

With my 200MHz 8260 based board, using kernel 2.4.19-pre7,
I fetch a large file (~50Mb) with ftp, and send it to /dev/null
  get large_file /dev/null
and I obtain the following performance:
  50216878 bytes received in 5.52 seconds (9090508 bytes/s)

I will check smaller files. I know that there is a nice burst of activity
when the transfer starts. Can you try 100MB+ transfer and see if you still
get the same performance. Perhaps I should try 2.4.19pre7. If I get better
results it sure helps to narrow the search for likely suspects. I will also
try piping to /dev/null.

If the performance drops in 100Mbps full duplex, the problem might be
one of configuration between your BCM switch and the external switch.
Are both ends of the link (between your BCM switch and external switch)
set to auto-negotiation?

The switch is a LinkSys 5 port 10/100 switch. (no configuration options that
I am aware of) All ports on the BCM should be in auto-negotiate mode. In a
previous version I printed the negotiation status of each port and it showed
100, full-duplex.

Thanks for the pointers. Based on the emails that I have received, I am not
the only one with this problem. Hopefully we can reproduce your results and
provide some feedback to the group.


** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/