at 2011-11-24 16:38, debuguo said:
My test result is not only slow but also strange.
0.4 second at the most of the time, but sometimes it would be 3 sec.
I tried again, change loop count to a very big value, nowthe connect()
blocked 3 sec sometimes.
tcpdump shows somethings:
011-11-24 17:29:47.749655 IP localhost.38363 > localhost.socks: Flags
[F.], seq 3855382321, ack 3394797453, win 257, options [nop,nop,TS val
28573710 ecr 28573651], length 0
2011-11-24 17:29:47.749702 IP localhost.38364 > localhost.socks: Flags
[F.], seq 496093496, ack 3389089195, win 257, options [nop,nop,TS val
28573710 ecr 28573651], length 0
2011-11-24 17:29:47.749894 IP localhost.socks > localhost.38363: Flags
[R.], seq 1, ack 1, win 256, options [nop,nop,TS val 28573710 ecr
28573710], length 0
2011-11-24 17:29:47.749987 IP localhost.socks > localhost.38364: Flags
[R.], seq 1, ack 1, win 256, options [nop,nop,TS val 28573710 ecr
28573710], length 0
2011-11-24 17:29:50.517717 IP localhost.38365 > localhost.socks: Flags
[S], seq 4037677770, win 32792, options [mss 16396,sackOK,TS val
28574402 ecr 0,nop,wscale 7], length 0
2011-11-24 17:29:50.517751 IP localhost.socks > localhost.38365: Flags
[S.], seq 743007410, ack 4037677771, win 32768, options [mss
16396,sackOK,TS val 28574402 ecr 28574402,nop,wscale 7], length 0
2011-11-24 17:29:50.517778 IP localhost.38365 > localhost.socks: Flags
[.], ack 1, win 257, options [nop,nop,TS val 28574402 ecr 28574402],
length 0
2011-11-24 17:30:02.464295 IP localhost.socks > localhost.38365: Flags
[R.], seq 1, ack 1, win 256, options [nop,nop,TS val 28577388 ecr
28574402], length 0
from 17:29:47 to 17:29:50, there is a 3 seconds gap. the connect() was
invoked at 17:29:47, and its first SYN was sent out at 17:29:50. what
happened in the 3 seconds? any one can explain this?
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