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Message-ID: <20120206162136.GJ27935@redhat.com> Date: Mon, 6 Feb 2012 11:21:36 -0500 From: "Frank Ch. Eigler" <fche@...hat.com> To: Neil Horman <nhorman@...driver.com> Cc: 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>, "eric.dumazet@...il.com" <eric.dumazet@...il.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 Hi - On Mon, Feb 06, 2012 at 10:53:05AM -0500, Neil Horman wrote: > [...] If you're unfamiliar with them, netfilter hooks are those > standard points in the network input/output/forwarding paths at > which we can watch and maniupulate network traffic. [...] Aha, nf_register_hook and friends. Thanks for the pointer. > > 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? > I suppose you could. [...] I'm suggesting a kernel module because > then you wouldn't have the performance overhead of moving all those > frames to user space. (For what it's worth, if there were a tracepoint in the netfilter hook machinery, stap would be able to process the packets likewise, in-kernel, with no kernel debuginfo installed.) - FChE -- 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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