Hello all, I am having trouble with transmit performance on one of my Nevada boxes, receiving works fine and has acceptable performance for a gigabit network, but transmitting data is several times slower.
The machine that has this problem is a snv_104 box with an e1000g (intel 82541) interface. I have backed out what I think is the bug previously discussed in the e1000g driver for the 82541 chipset (and the performance is not a few hundred megabit and not kilobits) Receiving data on the affected machine from a Mac or a 2008.11 host gives me ~ 850MBit/s. Sending data to ether of the other hosts gives me about 300MBit/s. I tested to boot another OS from a live CD on this host and it gave me at least 650MBit/s when sending data. These tests are mede with iperf, but i noticed the problem when transferring files from the host. I have tried to tone some TCP parameters but with no luck (tcp_cwnd_max, tcp_xmit_hiwat, tcp_recv_hiwat) Is this another chips specific bug with the 1000g driver or is there something else I am missing? It works as I said fine on a snv_101 with the 1000g driver but with another chip. The host is a dual core AMD athlon @ 2.7GHz so it should not have any trouble handling the load. Suggestions on where to look are welcome, thanks. Henrik Johansson http://sparcv9.blogspot.com _______________________________________________ networking-discuss mailing list [email protected]
