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SubjectRe: [BETA-0.94] Fifth test release of Tigon3 driver
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
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