netdev - Re: Possible regression: Packet drops during iptables calls

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Message-ID: <1292508821.2883.156.camel@edumazet-laptop>
Date:	Thu, 16 Dec 2010 15:13:41 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jesper Dangaard Brouer <hawk@...x.dk>
Cc:	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Steven Rostedt <srostedt@...hat.com>,
	Alexander Duyck <alexander.h.duyck@...el.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	netfilter-devel <netfilter-devel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
Subject: Re: Possible regression: Packet drops during iptables calls

Le jeudi 16 décembre 2010 à 15:04 +0100, Jesper Dangaard Brouer a
écrit :

> Now I just need to calculate, how large a NIC buffer I need to buffer
> 3.125 ms at 1Gbit/s.
> 
>  3.125 ms *  1Gbit/s = 390625 bytes
> 
> Can this be correct?
> 
> How much buffer does each queue have in the 82576 NIC?
> (Hope Alexander Duyck can answer this one?)
> 

Worst case is if you receive very small frames, because 3.125 ms is
about 5000 frames at 1Gbit/s



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