I am not sure how/where you would check this but maybe the card is
operating in simplex mode in which case I believe it makes sense you
are getting approximately half of gigabit. Someone please correct me
if I am wrong.
Moshe
On Tuesday, March 1, 2011, David Burgess wrote:
> 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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