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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. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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