netdev - Re: [PATCH v6] net: batch skb dequeueing from softnet input_pkt

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Message-ID: <20100502154649.GA18063@gargoyle.fritz.box>
Date:	Sun, 2 May 2010 17:46:49 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, hadi@...erus.ca,
	xiaosuo@...il.com, therbert@...gle.com, shemminger@...tta.com,
	netdev@...r.kernel.org, lenb@...nel.org, arjan@...radead.org
Subject: Re: [PATCH v6] net: batch skb dequeueing from softnet
	input_pkt_queue

> In this test, all 16 queues of one BCM57711E NIC (1Gb link) delivers
>  packets at about 1.300.000 pps to 16 cpus (one cpu per queue) and these
> packets are then redistributed by RPS to same 16 cpus, generating about
> 650.000 IPI per second.

BTW if rps was SMT aware it could avoid a lot of the IPIs in the first place.

-Andi

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