On Tue, 1 Mar 2005, Ben Greear wrote:
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.
I supplied the actual settings.
What happens if you just don't muck with the NIC and let it auto-negotiate on it's own?
It goes to half-duplex and runs 9 to 9.5 megabytes/second as stated above.
That's why I think 1/2 duplex is __really__ full-duplex.
Ben
-- Ben Greear <[EMAIL PROTECTED]> Candela Technologies Inc http://www.candelatech.com
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