TomatoUSB

I can't seem to get Gigabit speeds out of my wired links on WRT610v2. I've got iperf 2.0.4-1 installed from Optware, and my latest attempt (eliminating other nodes) involved running iperf server and client on the router on the local loop, and I am still only getting ~200Mbit/s. Here is how it goes:

iperf -s -l 64k -w 64k -fm &
iperf -c 127.0.0.1 -l 64k -w 64k -t 60 -i 60 -fm

And the output looks like this:

[  7] local 127.0.0.1 port 5001 connected with 127.0.0.1 port 32031
------------------------------------------------------------
Client connecting to 127.0.0.1, TCP port 5001
TCP window size: 0.13 MByte (WARNING: requested 0.06 MByte)
------------------------------------------------------------
[  5] local 127.0.0.1 port 32031 connected with 127.0.0.1 port 5001
[ ID] Interval       Transfer     Bandwidth
[  5]  0.0-60.0 sec  1560 MBytes    218 Mbits/sec
[ ID] Interval       Transfer     Bandwidth
[  5]  0.0-60.0 sec  1560 MBytes    218 Mbits/sec
[ ID] Interval       Transfer     Bandwidth
[  7]  0.0-60.0 sec  1560 MBytes    218 Mbits/sec

And it seems that my LAN transfers are capped at around the same 200MBit/sec. What am I missing here? Something is clearly not right…

P.S. I am using TomatoUSB v1.28/VPN (latest beta)

I see pretty much identical behavior w/ my WNR3500L running a similar tomato version (v1.28.9051 MIPSR2-beta22 K26 USB vpn3.6). I'm not sure iperf is working that well. I see ~100Mbits/sec running a iperf client w/ the router as server and ~60Mbits/sec running the client on the router and the server on my pc. I also notice that iperf is using pretty much 100% cpu. Do you have an independent measurement that agrees w/ the speeds reported? I don't have a good way to set up a different server/client combination.