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

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Message-ID: <1328541859.2220.52.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC>
Date:	Mon, 06 Feb 2012 16:24:19 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Frank Ch. Eigler" <fche@...hat.com>
Cc:	Neil Horman <nhorman@...driver.com>,
	Hagen Paul Pfeifer <hagen@...u.net>,
	"Frank Ch. Eigler" <fche@...stic.org>,
	Satoru Moriya <satoru.moriya@....com>,
	David Miller <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"tgraf@...radead.org" <tgraf@...radead.org>,
	"stephen.hemminger@...tta.com" <stephen.hemminger@...tta.com>,
	Seiji Aguchi <seiji.aguchi@....com>, fche@...rceware.org,
	mathieu.desnoyers@...ymtl.ca, rostedt@...dmis.org
Subject: Re: [PATCH v2 0/2] Tracepoint for tcp retransmission

Le lundi 06 février 2012 à 10:20 -0500, Frank Ch. Eigler a écrit :

> > [...] If something is needed in the short term for Satoru, I still
> > think a privately maintained module that registers a netfilter hook
> > to watch outgoing packets for retransmits offers a good solution.
> 
> Does this mean that this netfilter hook mechanism is sufficient to
> adapt to the current/future diversity of behaviors?  Why not make
> *that* into a tracepoint then, so perf/stap scripts could get at it in
> userspace?

Anyway, this netfilter module wont catch the failed retransmits (because
of memory allocation errors or other checks done in our stack)



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