Jeff Garzik: > And, what MTU are you using? You may have answered this earlier and I > forgot :) If you -are- on a gigabit network, then you [currently] must > manually enable an MTU of 9000 (jumbo frames). First mail with MTU 9000, tg3 in both ends: test8:/usr/src/LMbench/bin/i686-pc-linux-gnu# ./lat_tcp 129.241.56.160 TCP latency using 129.241.56.160: 146.3539 microseconds However, there seems to be a problem with the bw_tcp-tool, cause it just hangs, trying to strace it won't gimme me much usefull info about why it hangs either. (it worked like a charm with 1500 MTUs). Ok, right now I just tried the nttcp tool (which I used to benchmark this driver in an earlier posting), it seems like there's a bug with MTU 9000 and TCP: [this is UDP, works like a charm] kiwi:/usr/src# /root/nttcp-1.47/nttcp -t -u -v 129.241.56.161 nttcp-l: nttcp, version 1.47 nttcp-l: Pid=10519 nttcp-l: from 129.241.56.161: "129.241.56.161" (=nttcp-1: Pid=3197, InetPeer= 1) nttcp-l: from 129.241.56.161: "129.241.56.161" (=nttcp-1: Optionline="nttcp@-r@) nttcp-l: from 129.241.56.161: "129.241.56.161" (=dataport: 5038) nttcp-l: send window size = 65535 nttcp-l: receive window size = 65535 nttcp-l: buflen=4096, bufcnt=2048, dataport=5038/udp nttcp-l: try to get outstanding messages from 1 remote clients nttcp-l: transmitted 8388608 bytes l 8388608 0.07 0.02 993.7049 3355.4432 2051 30369.89 102550.0 nttcp-l: try to get outstanding messages from 1 remote clients nttcp-1: got EOF nttcp-1: received 0 bytes 1 0.07 0.00 0.0000 0.0000 1 14.64 100000.0 nttcp-1: exiting [and this is TCP, doesn't exactly work like a charm] kiwi:/usr/src# /root/nttcp-1.47/nttcp -t -v 129.241.56.161 nttcp-l: nttcp, version 1.47 nttcp-l: Pid=10520 nttcp-l: from 129.241.56.161: "129.241.56.161" (=nttcp-1: Pid=3198, InetPeer= 1) nttcp-l: from 129.241.56.161: "129.241.56.161" (=nttcp-1: Optionline="nttcp@-r@) nttcp-l: from 129.241.56.161: "129.241.56.161" (=dataport: 5038) nttcp-l: send window size = 27900 nttcp-l: receive window size = 87380 nttcp-l: buflen=4096, bufcnt=2048, dataport=5038/tcp nttcp-l: try to get outstanding messages from 1 remote clients nttcp-1: accept from 129.241.56.160 nttcp-l: try to get outstanding messages from 1 remote clients nttcp-1: send window size = 27900 nttcp-1: receive window size = 87380 nttcp-l: try to get outstanding messages from 1 remote clients nttcp-1: buflen=4096, bufcnt=2048, dataport=5038/tcp [cause here it hangs] I can still stop the program with CTRL-C, so I dont' know what it is, someone enlighten me, please? :) -- Thomas - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
