Howard Chu a écrit :
Eric Dumazet wrote:
On Tuesday 06 March 2007 10:22, Howard Chu wrote:
It's a combination of 2MSL and /proc/sys/net/ipv4/ip_local_port_range -
on my system the default port range is 32768-61000. That means if I use
up 28232 ports in less than 2MSL then everything stops. netstat will
show that all the available port numbers are in TIME_WAIT state. And
this is particularly bad because while waiting for the timeout, I can't
initiate any new outbound connections of any kind at all - telnet, ssh,
whatever, you have to wait for at least one port to free up.
(Interesting denial of service there....)
Granted, I was running my test on 2.6.18, perhaps 2.6.21 behaves
differently.
Could you try this attached program and tell me whats happen ?
$ gcc -O2 -o socktest socktest.c -lpthread
$ time ./socktest -n 100000
nb_conn=99999 nb_accp=99999
real 0m5.058s
user 0m0.212s
sys 0m4.844s
(on my small machine, dell d610 :) )
On my Asus laptop (2GHz Pentium M) the first time I ran it it completed
in about 51 seconds, with no errors. I then copied it to another machine
and started it up there, and got connect errors right away. I then went
back to my laptop and ran it again, and got errors that time.
This is the laptop run with errors:
viola:~/src> uname -a
Linux viola 2.6.18.2-34-default #1 SMP Mon Nov 27 11:46:27 UTC 2006 i686
i686 i386 GNU/Linux
viola:~/src> time ./socktest -n 1000000
connect error 99
connect error 99
connect error 99
connect error 99
connect error 99
connect error 99
connect error 99
connect error 99
connect error 99
connect error 99
nb_conn=993757 nb_accp=993757
1.408u 88.649s 1:42.76 87.6% 0+0k 0+0io 0pf+0w
This is my other system, an AMD X2 3800+ (dual core)
mandolin:~/src> uname -a
Linux mandolin 2.6.18.3SMP #9 SMP Sat Nov 25 10:08:51 PST 2006 x86_64
x86_64 x86_64 GNU/Linux
mandolin:~/src> gcc -O2 -o socktest socktest.c -lpthread
mandolin:~/src> time ./socktest -n 1000000
connect error 99
connect error 99
connect error 99
connect error 99
connect error 99
connect error 99
connect error 99
connect error 99
connect error 99
connect error 99
nb_conn=957088 nb_accp=957088
1.012u 630.991s 5:18.05 198.7% 0+0k 0+0io 0pf+0w
Let me see, any chance you can try the prog on 2.6.20 ?
If not, please send :
grep . /proc/sys/net/ipv4/*
Thank you
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