netdev - Re: Packet capturing performance

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Message-ID: <1432134405.4060.27.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Wed, 20 May 2015 08:06:45 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Deniz Eren <denizlist@...izeren.net>
Cc:	netdev@...r.kernel.org
Subject: Re: Packet capturing performance

On Wed, 2015-05-20 at 16:13 +0300, Deniz Eren wrote:

> But after some investigation and some advice from more expert people
> the problem seems to be pf_packet sockets overhead. But I don't know
> exactly where is the bottleneck. Do you have any idea exactly where
> could be the bottleneck?

You use a multi queue NIC.

Make sure you setup proper IRQ affinities to serve IRQ in a sharded way.

The key is to try to have one packet queue to receive a copy of the
sniffed traffic per cpu.

AF_PACKET has PACKET_FANOUT / PACKET_FANOUT_CPU capability.



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