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

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Date:	Mon, 11 Jun 2007 08:52:15 -0400
From:	jamal <hadi@...erus.ca>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	"Waskiewicz Jr, Peter P" <peter.p.waskiewicz.jr@...el.com>,
	davem@...emloft.net, netdev@...r.kernel.org, jeff@...zik.org,
	"Kok, Auke-jan H" <auke-jan.h.kok@...el.com>
Subject: Re: [PATCH] NET: Multiqueue network device support.

On Mon, 2007-11-06 at 14:39 +0200, Patrick McHardy wrote:
> jamal wrote:
> > On Mon, 2007-11-06 at 13:58 +0200, Patrick McHardy wrote:
> > 

> > Sure. Packets stashed on the any DMA ring are considered "gone to the
> > wire". That is a very valid assumption to make.
> 
> 
> I disagree, its obviously not true 

Patrick, you are making too strong a statement. Take a step back:
When you put a packet on the DMA ring, are you ever going to take it
away at some point before it goes to the wire? 

> and leads to the behaviour I
> described. If it were true there would be no reason to use multiple
> HW TX queues to begin with.

In the general case, they are totaly useless.
They are  useful when theres contention/congestion. Even in a shared
media like wireless. 
And if there is contention, the qdisc scheduler will do the right thing.

cheers,
jamal

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