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

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Date:	Thu, 07 Jun 2007 08:03:29 -0700
From:	"Kok, Auke" <auke-jan.h.kok@...el.com>
To:	hadi@...erus.ca
CC:	Jeff Garzik <jeff@...zik.org>, David Miller <davem@...emloft.net>,
	kaber@...sh.net, peter.p.waskiewicz.jr@...el.com,
	netdev@...r.kernel.org,
	Jesse Brandeburg <jesse.brandeburg@...el.com>
Subject: Re: [PATCH] NET: Multiqueue network device support.

jamal wrote:
> On Wed, 2007-06-06 at 20:47 -0400, Jeff Garzik wrote:
> 
>> 1) you need (a) well-designed hardware _and_ (b) a smart driver writer
>> to avoid bottlenecking on internal driver locks.  As you can see we have
>> both (a) and (b) for tg3 ;-)  
> 
> How about the following patch which fixes #b for e1000 ;->
> I think the e1000s challenges are related to the gazillion variations of
> boards they support and a little challenge of too many intel cooks.
> 
> Auke, why do you need the tx ring lock?

To prevent against multiple entries bumping head & tail at the same time as well 
as overwriting the same entries in the tx ring (contention for 
next_to_watch/next_to_clean)? It may be unlikely but ripping out the tx ring 
lock might not be a good idea, perhaps after we get rid of LLTX in e1000?

to be honest: I'm open for ideas and I'll give it a try, but stuff like this 
needs to go through some nasty stress testing (multiple clients, long time) 
before I will consider it seriously, but fortunately that's something I can do.

Auke
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