From: David Miller <davem@davemloft.net>
To: willemb@google.com
Cc: netdev@vger.kernel.org, edumazet@google.com, therbert@google.com
Subject: Re: [PATCH net-next] rps: overflow prevention for saturated cpus
Date: Fri, 07 Dec 2012 14:20:04 -0500 (EST) [thread overview]
Message-ID: <20121207.142004.1330913822593924898.davem@davemloft.net> (raw)
In-Reply-To: <1354826194-9289-1-git-send-email-willemb@google.com>
From: Willem de Bruijn <willemb@google.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.
next prev parent reply other threads:[~2012-12-07 19:20 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-06 20:36 [PATCH net-next] rps: overflow prevention for saturated cpus Willem de Bruijn
2012-12-06 22:25 ` Rick Jones
2012-12-06 23:04 ` Willem de Bruijn
2012-12-06 23:45 ` Rick Jones
2012-12-07 16:04 ` Willem de Bruijn
2012-12-07 14:51 ` Ben Hutchings
2012-12-07 16:41 ` Willem de Bruijn
2012-12-07 19:20 ` David Miller [this message]
2012-12-10 20:09 ` Willem de Bruijn
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