netdev - Re: [PATCH] Add useful per-connection TCP stats for diagnosis purpose.

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Message-ID: <1300510960.2831.2.camel@edumazet-laptop>
Date:	Sat, 19 Mar 2011 06:02:40 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jerry Chu <hkchu@...gle.com>
Cc:	Stephen Hemminger <shemminger@...tta.com>, netdev@...r.kernel.org
Subject: Re: [PATCH] Add useful per-connection TCP stats for diagnosis
 purpose.

Le vendredi 18 mars 2011 à 21:33 -0700, Jerry Chu a écrit :

> I'm well aware of the past, hideous O(n**2) problem of reading
> /proc/net/tcp but I
> thought the problem has been fixed by Tom Herbert a while back, no?
> (See http://marc.info/?l=linux-netdev&m=127588123429437&w=2)
> 

O(N) is still too slow, to gather stats for your socket, if you want to
gather stats once per second for example.

AFAIK, I am not sure we want to allow any user to access all these data
for all tcp sockets on the machine. This might have security impacts.

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