netdev - Telnet closing delay

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Message-ID: <3C59DB883F7B0B4D8096010D45ACCD1323004D@exch.facton.local>
Date:	Tue, 1 May 2007 22:48:11 +0200
From:	"Beschorner Daniel" <Daniel.Beschorner@...ton.com>
To:	<netdev@...r.kernel.org>
Subject: Telnet closing delay

Since 2.6.21 I often got a 2 seconds delay when closing a telnet session
to such a machine (even to localhost).
I was at least not aware of this with older versions, but maybe I'm
wrong?!?

Client with delay:

0.000062 select(4, [0 3], [], [3], NULL) = 1 (in [3])
1.803057 recvfrom(3, "", 8192, 0, NULL, NULL) = 0

without delay:

0.000061 select(4, [0 3], [], [3], NULL) = 1 (in [3])
0.001491 recvfrom(3, "", 8192, 0, NULL, NULL) = 0

Server with delay:

0.000095 select(4, [0 3], [], [0], NULL) = 1 (in [3])
0.001779 read(3, 0x8059de0, 8192)  = -1 EIO (Input/output error)
0.000103 select(4, [0 3], [], [0], NULL) = 1 (in [3])
0.000171 read(3, 0x8059de0, 8192)  = -1 EIO (Input/output error)
 ---- and 10000 lines more of this select/read----
0.000103 select(4, [0 3], [], [0], NULL) = 1 (in [3])
0.000343 --- SIGCHLD (Child exited) @ 0 (0) ---

without delay:

0.000100 select(4, [0 3], [], [0], NULL) = 1 (in [3])
0.001757 --- SIGCHLD (Child exited) @ 0 (0) ---

Daniel
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