From: Chuck Ebbert <cebbert@redhat.com>
To: James Nichols <jamesnichols3@gmail.com>
Cc: Eric Dumazet <dada1@cosmosbay.com>,
Jan Engelhardt <jengelh@computergmbh.de>,
linux-kernel@vger.kernel.org
Subject: Re: After many hours all outbound connections get stuck in SYN_SENT
Date: Tue, 18 Dec 2007 15:28:36 -0500 [thread overview]
Message-ID: <47682D74.9010509@redhat.com> (raw)
In-Reply-To: <83a51e120712181145l75a19e72o3194676b05a855a6@mail.gmail.com>
On 12/18/2007 02:45 PM, James Nichols wrote:
>
> I've run tcpdump for all IPs during this problem. I haven't tried
> doing it for a single explicit IP address- due to the nature of the
> workload it's very difficult to know which IPs will be hit at any
> given moment. What I did see in the full IP captures is that the
> returning ACKs don't show up in the packet capture. Unfortunately,
> tcpdump reported that some packets were dropped during the capture.
> Is it possible that the kernel was dropping the packets before they
> could be captured by tcpdump?
>
The only way to get a reliable trace is to run a capture from a port
mirror on the switch the server is connected to. Capturing from inside
the server at the same time and comparing the traces could be useful.
prev parent reply other threads:[~2007-12-18 20:29 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-14 20:39 After many hours all outbound connections get stuck in SYN_SENT James Nichols
2007-12-17 23:14 ` Jan Engelhardt
2007-12-18 15:34 ` James Nichols
2007-12-18 16:05 ` Jan Engelhardt
2007-12-18 16:45 ` James Nichols
2007-12-18 17:19 ` Jan Engelhardt
2007-12-18 18:09 ` James Nichols
2007-12-18 18:14 ` Jan Engelhardt
2007-12-18 18:21 ` James Nichols
2007-12-18 18:30 ` Jan Engelhardt
2007-12-18 18:32 ` Eric Dumazet
2007-12-18 19:44 ` James Nichols
2007-12-18 20:37 ` Eric Dumazet
2007-12-18 21:20 ` Jan Engelhardt
2007-12-19 16:53 ` James Nichols
2007-12-19 17:07 ` Eric Dumazet
2007-12-19 17:43 ` James Nichols
2007-12-19 17:58 ` Jan Engelhardt
2007-12-19 18:12 ` James Nichols
2007-12-20 14:41 ` Glen Turner
2007-12-20 16:37 ` James Nichols
2007-12-20 21:05 ` Ilpo Järvinen
2007-12-21 6:06 ` Jan Engelhardt
2007-12-21 4:51 ` Glen Turner
2007-12-21 13:57 ` James Nichols
2007-12-19 18:03 ` Eric Dumazet
2007-12-19 21:27 ` Ilpo Järvinen
2007-12-20 16:08 ` James Nichols
2007-12-20 20:44 ` Ilpo Järvinen
2007-12-20 20:49 ` Justin Banks
2007-12-18 19:45 ` James Nichols
2007-12-18 20:28 ` Chuck Ebbert [this message]
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