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

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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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