netdev - Re: [PATCH] IPROUTE: Modify tc for new PRIO multiqueue behavior

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Message-Id: <20070504.130619.99203618.davem@davemloft.net>
Date:	Fri, 04 May 2007 13:06:19 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	shemminger@...ux-foundation.org
Cc:	peter.p.waskiewicz.jr@...el.com, hadi@...erus.ca, kaber@...sh.net,
	netdev@...r.kernel.org, jgarzik@...ox.com, cramerj@...el.com,
	auke-jan.h.kok@...el.com, christopher.leech@...el.com
Subject: Re: [PATCH] IPROUTE: Modify tc for new PRIO multiqueue behavior

From: Stephen Hemminger <shemminger@...ux-foundation.org>
Date: Fri, 4 May 2007 13:01:10 -0700

> Just because they want to standardize, and put it in hardware doesn't
> mean it is a good idea and Linux needs to support it!
> 
> Why is it better for hardware to make the "next packet to send" decision?
> For wired ethernet, I can't see how adding the complexity of fixed number
> of small queues is a gain. Better to just do the priority decision in software
> and then queue it to the hardware. This seems like the old Token Ring
> and MAP/TOP style crap crammed on top of Ethernet.

I suspect perhaps the real impetus behind this facility is not being
disclosed.

It certainly is not going to be faster to do this in hardware.

I myself don't see why in the world one would want to do this in
hardware either.  Software can do the selection fast enough and with
tons more flexibility.
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