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

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Date:	Wed, 21 Dec 2011 08:05:11 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Satoru Moriya <satoru.moriya@....com>
Cc:	Hagen Paul Pfeifer <hagen@...u.net>,
	Stephen Hemminger <stephen.hemminger@...tta.com>,
	"nhorman@...driver.com" <nhorman@...driver.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"tgraf@...radead.org" <tgraf@...radead.org>,
	Seiji Aguchi <seiji.aguchi@....com>,
	"dle-develop@...ts.sourceforge.net" 
	<dle-develop@...ts.sourceforge.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH 0/2] Tracepoint for tcp retransmission

Le mardi 20 décembre 2011 à 18:40 -0500, Satoru Moriya a écrit :

> We use trace_kfree_skb() which 63e03724b51 uses to detect packet
> drop event. In addition to that, we would like to detect errors
> in TCP layer for better trouble shooting.
> 

If you feel we miss a counter in a particular spot, just add it, so that
even a newbie can report "netstat -s" values in a message for analysis.

Not re-sending a frame because of a temporary shortage of memory is not
an error per se, TCP will recover eventually, but keeping track of these
events might be useful (once we have not percpu counters for this, but
regular atomic counters)





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