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

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Message-ID: <20120206153807.GA3620@hmsreliant.think-freely.org>
Date:	Mon, 6 Feb 2012 10:38:07 -0500
From:	Neil Horman <nhorman@...driver.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	"Frank Ch. Eigler" <fche@...hat.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

On Mon, Feb 06, 2012 at 04:24:19PM +0100, Eric Dumazet wrote:
> 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)
> 
But the existing kfree_skb tracepoint will.  As will the TCPRETANSFAIL counter.
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