Hi,
Another TCP stall (2.6.12pre6 on both ends):
> intrepid is X11-server with ssh connection to defiant (X11-forwarding,
> EPIC100 PCI NIC). defiant is an older notebook machine and it was running
> XEmacs and Firefox with ssh/X11 (cardbus DEC 21143).
> Both on the same Ethernet subnet. Both standard MTU etc.
[DEF] is TCP defiant:ssh
[INT] is TCP intrepid:4782
intrepid:~# netstat -to | grep 4782; tcpdump -w stall -s 1600 -i eth0
Sat Jun 11 15:55:51 CEST 2005
Recv-Q Send-Q
tcp 0 0 [INT] [DEF] ESTABLISHED keepalive (675.46/0/0)
tcpdump file basically shows (TCP already stalled):
15:56:27.1 [INT] > [DEF]: P 569644050:569644162(112) ack 3725119932 win 31164
<nop,nop,timestamp 6388700 274348581,nop,nop,sack sack 1 {1449:14985} >
15:56:27.1 [DEF] > [INT]: . ack 112 win 16022 <nop,nop,timestamp 274631570
6388700>
15:56:27.1 [INT] > [DEF]: P 112:256(144) ack 1 win 31164 <nop,nop,timestamp
6388701 274348581,nop,nop,sack sack 1 {1449:14985} >
15:56:27.1 [DEF] > [INT]: . ack 256 win 16022 <nop,nop,timestamp 274631571
6388701>
15:56:27.1 [INT] > [DEF]: P 256:336(80) ack 1 win 31164 <nop,nop,timestamp
6388710 274348581,nop,nop,sack sack 1 {1449:14985} >
15:56:27.1 [DEF] > [INT]: . ack 336 win 16022 <nop,nop,timestamp 274631579
6388710>
...
16:04:09.6 [DEF] > [INT]: . ack 35536 win 16022 <nop,nop,timestamp 275094166
6851304>
16:04:09.7 [INT] > [DEF]: P 35536:35616(80) ack 1 win 31164 <nop,nop,timestamp
6851394 274348581,nop,nop,sack sack 1 {1449:14985} >
16:04:09.7 [DEF] > [INT]: . ack 35616 win 16022 <nop,nop,timestamp 275094256
6851394>
16:05:12.7 [DEF] > [INT]: . 1:1449(1448) ack 35616 win 16022 <nop,nop,timestamp
275157275 6851394>
16:08:14.3 [INT] > [DEF]: P 35616:35760(144) ack 1 win 31164 <nop,nop,timestamp
7096034 274348581,nop,nop,sack sack 1 {1449:14985} >
16:08:14.3 [DEF] > [INT]: R 3725119932:3725119932(0) win 0
defiant:~# netstat -to | grep 4782
Recv-Q Send-Q
tcp 0 54512 [DEF] [INT] ESTABLISHED on (81.30/10/0)
and Send-Q is constant until TCP reset.
> Ideas?
--
Krzysztof Halasa
|