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

David Miller
2007-05-04T20:06:33Z

From: Stephen Hemminger <shemminger@linux-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.