netdev - Re: [PATCH] NET: Multiqueue network device support.

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Date:	Tue, 12 Jun 2007 14:55:34 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	lunz@...ooley.org
Cc:	greearb@...delatech.com, jeff@...zik.org, netdev@...r.kernel.org,
	kaber@...sh.net, hadi@...erus.ca, peter.p.waskiewicz.jr@...el.com,
	auke-jan.h.kok@...el.com
Subject: Re: [PATCH] NET: Multiqueue network device support.

From: Jason Lunz <lunz@...ooley.org>
Date: Tue, 12 Jun 2007 17:47:53 -0400

> Are you aware of any hardware designs that allow other ways to map
> packets onto rx queues?  I can think of several scenarios where it could
> be advantageous to map packets by IP 3- or 5-tuple to get cpu locality
> all the way up the stack on a flow-by-flow basis. But doing this would
> require some way to request this mapping from the hardware.

These chips allow this too, Microsoft defined a standard for
RX queue interrupt hashing by flow so everyone puts it, or
something like it, in hardware.

> In the extreme case it would be cool if it were possible to push a
> bpf-like classifier down into the hardware to allow arbitrary kinds of
> flow distribution.

Maybe not a fully bpf, but many chips allow something close.
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