linux-kernel - Re: [bug] stuck localhost TCP connections, v2.6.26-rc3+

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Message-ID: <20080526141713.GA5771@elte.hu>
Date:	Mon, 26 May 2008 16:17:13 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Ilpo J?rvinen <ilpo.jarvinen@...sinki.fi>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Netdev <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [bug] stuck localhost TCP connections, v2.6.26-rc3+


* Ingo Molnar <mingo@...e.hu> wrote:

> i also ran this for 15 minutes:
> 
>   [root@...ope ~]# tcpdump src and dst 10.0.1.15 -n
>   tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
>   listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
> 
> but there was no output at all - i.e. TCP has not attempted to do 
> anything to these connections.

... which is not surprising as it traced eth0 ;-) [10.0.1.15 is the IP 
of the box and routes back to loopback]

with the proper tcpdump it gave:

[root@...ope ~]# tcpdump -i lo
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on lo, link-type EN10MB (Ethernet), capture size 96 bytes
16:15:05.260000 IP europe.37198 > europe.distcc: . ack 2022529163 win 257 <nop,nop,timestamp 209526 197526>
16:15:05.260000 IP europe.distcc > europe.37198: . ack 1 win 0 <nop,nop,timestamp 209526 7020>

hm, a window of 257 and zero, is that right?

	Ingo
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