2.0-RC1 (amd64)
built on Tue Mar 1 15:52:28 EST 2011

Core i3 550 3.2 GHz
4GB RAM
Intel GBE

I've just set this system up doing some crude throughput testing with
iperf. The most I can push through this box from LAN to WAN is a
steady 503-520 mbps, using the default mtu (higher mtu values produce
no throughput on iperf for reasons I haven't looked into. I'm
suspecting no support in the switch). top -SH is showing ~25%
interrupt usage and 30%+ idle on both cores. Hyperthreading is
disabled. I'm using a single NIC with vlans, but testing in only one
direction, so the NIC is sending and receiving a total of about 530
mbit x2 during the test.

iperf test machines show minimal CPU usage during the test, and have
no other significant network activity happening concurrently. The
switch is a Netgear ProSafe GS108E, which is ostensibly non-blocking.

I expected better throughput than that. Any ideas what is holding this
thing back, or where I could look to find out?

Thanks,

db

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