netdev - RE: [PATCH v2 0/2] Tracepoint for tcp retransmission

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Date:	Fri, 03 Feb 2012 21:55:51 +0100
From:	Hagen Paul Pfeifer <hagen@...u.net>
To:	Satoru Moriya <satoru.moriya@....com>
Cc:	<netdev@...r.kernel.org>, <davem@...emloft.net>,
	<nhorman@...driver.com>, <tgraf@...radead.org>,
	Stephen Hemminger <stephen.hemminger@...tta.com>,
	<eric.dumazet@...il.com>, Seiji Aguchi <seiji.aguchi@....com>
Subject: RE: [PATCH v2 0/2] Tracepoint for tcp retransmission


On Fri, 3 Feb 2012 15:43:30 -0500, Satoru Moriya wrote:

> Actually, we've already used systemtap in our flight recorder.
> But we believe that tcp retransmission is one of the fundamental
> function in tcp stack and so kernel itself should provide the
> instruments from which we can get enough information without
> tools which is not included in kernel.

Mhh, that's no real reason to add tracepoints all over. There where some
lengthy debates on lkml about inflationary use of tracepoints. Especially
this case where systemtap can provide the same information (btw: for
tracepoints you may also need some userspace tools). Maybe you should start
to improve systemtap. ;) But hey, it is David who decides if he is fine
with your patch.

Hagen
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