netdev - Re: [PATCH net-next] rps: overflow prevention for saturated cpus

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Date:	Fri, 07 Dec 2012 14:20:04 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	willemb@...gle.com
Cc:	netdev@...r.kernel.org, edumazet@...gle.com, therbert@...gle.com
Subject: Re: [PATCH net-next] rps: overflow prevention for saturated cpus

From: Willem de Bruijn <willemb@...gle.com>
Date: Thu,  6 Dec 2012 15:36:34 -0500

> This patch maintains flow affinity in normal conditions, but
> trades it for throughput when a cpu becomes saturated. Then, packets
> destined to that cpu (only) are redirected to the lightest loaded cpu
> in the rxqueue's rps_map. This breaks flow affinity under high load
> for some flows, in favor of processing packets up to the capacity
> of the complete rps_map cpuset in all circumstances.

We specifically built-in very strict checks to make sure we never
deliver packets out-of-order.  Those mechanisms must be used and
enforced in any change of this nature.
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