netdev - Re: [PATCH 0/2] Tracepoint for tcp retransmission

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Message-ID: <20111218004944.GB14903@hell>
Date:	Sun, 18 Dec 2011 01:49:44 +0100
From:	Hagen Paul Pfeifer <hagen@...u.net>
To:	Stephen Hemminger <stephen.hemminger@...tta.com>
Cc:	Satoru Moriya <satoru.moriya@....com>, nhorman@...driver.com,
	davem@...emloft.net, tgraf@...radead.org,
	Seiji Aguchi <seiji.aguchi@....com>,
	dle-develop@...ts.sourceforge.net, netdev@...r.kernel.org
Subject: Re: [PATCH 0/2] Tracepoint for tcp retransmission

> Sometimes network packets are dropped for some reason. In enterprise
> systems which require strict RAS functionality, we must know the
> reason why it happened and explain it to our customers even if using
> TCP. When we investigate the incidents, at first we try to find out
> whether the problem is in the server(kernel, application) or else
> (router, hub etc). And next we try to find out which layer
> (application/middleware/kernel(IP/TCP/UDP/..)etc.) the problem
> occurs.

For the first question tcpdump may the right tool. For the later systemtap can
be used. I mean we now have the possibility to instrument the kernel at runtime,
without bloating the source. Anyway: is 63e03724b51 not suitable to gather the
required information easily?

Hagen
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