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

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Date:	Fri, 08 Jun 2007 09:12:52 -0400
From:	jamal <hadi@...erus.ca>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Sridhar Samudrala <sri@...ibm.com>,
	David Miller <davem@...emloft.net>, auke-jan.h.kok@...el.com,
	jeff@...zik.org, kaber@...sh.net, peter.p.waskiewicz.jr@...el.com,
	netdev@...r.kernel.org, jesse.brandeburg@...el.com
Subject: Re: [PATCH] NET: Multiqueue network device support.

On Fri, 2007-08-06 at 22:37 +1000, Herbert Xu wrote:

> Hmm I wasn't describing how it works now.  I'm talking about how it
> would work if we removed LLTX and replaced the private tx_lock with
> netif_tx_lock.

I got that - it is what tg3 does for example.
To mimick that behavior in LLTX, a driver needs to use the same lock on
both tx and receive. e1000 holds a different lock on tx path from rx
path. Maybe theres something clever i am missing; but it seems to be a
bug on e1000.
The point i was making is that it was strange i never had problems
despite taking away the lock on the tx side and using the rx side
concurently.

cheers,
jamal

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