Re: Network speed Linux-2.6.10

[Ben Greear <greearb@candelatech.com>]

linux-os wrote:
> 
> Conditions:
> 
> Intel NIC e100 device driver. Two identical machines.
> Private network, no other devices. Connected using a Netgear switch.
> Test data is the same thing sent from memory on one machine
> to a discard server on another, using TCP/IP SOCK_STREAM.
> 
> If I set both machines to auto-negotiation OFF and half duplex,
> I get about 9 to 9.5 megabytes/second across the private wire
> network.
> 
> If I set one machine to full duplex and the other to half-duplex
> I get 10 to 11 megabytes/second transfer across the network,
> regardless of direction.

That is asking for all sorts of trouble.

> If I set both machines to auto-negotiation OFF and full duplex,
> I get 300 to 400 kilobytes/second regardless of the direction.

Check for errors in the NICs counters (/proc/net/dev/) in this case.
It appears it is not actually set to full-duplex, or maybe it's
10Mbps-FD.  Use ethtool to see the actual settings.

What happens if you just don't muck with the NIC and let it auto-negotiate
on it's own?

Ben


-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com