netdev - Re: [PATCH] Software receive packet steering

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Date:	Thu, 23 Apr 2009 00:34:40 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	gandalf@...fs.se
Cc:	shemminger@...tta.com, dada1@...mosbay.com, therbert@...gle.com,
	andi@...stfloor.org, netdev@...r.kernel.org
Subject: Re: [PATCH] Software receive packet steering

From: Martin Josefsson <gandalf@...fs.se>
Date: Wed, 22 Apr 2009 16:33:17 +0200 (CEST)

> On Tue, 21 Apr 2009, Stephen Hemminger wrote:
> 
>> I would like to see some way to have multiple CPU's pulling packets
>> and adapting
>> the number of CPU's being used based on load. Basically, turn all
>> device is into
>> receive multiqueue. The mapping could be adjusted by user level (see
>> irqbalancer).
> 
> I've been toying with the irqbalancer idea as well.
> Set the number of software "queues" high and have a mapping table of
> queue->cpu and then let irqbalanced which has knowledge of cpu cache
> hirarchy etc balance the load by changing the mapping table as it sees
> fit.

Steering changes without any protocol specific handling is
a total non-started because of packet reordering.

Please understand how deeply important this when considering
any packet steering scheme.  You absolutely cannot allow it
to happen.
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