netdev - Re: [RFC] [PATCH] Don't run __qdisc

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Message-Id: <20090728.125919.146001472.davem@davemloft.net>
Date:	Tue, 28 Jul 2009 12:59:19 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	krkumar2@...ibm.com, jarkao2@...il.com, netdev@...r.kernel.org
Subject: Re: [RFC] [PATCH] Don't run __qdisc_run() on a stopped TX queue

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Tue, 28 Jul 2009 15:12:47 +0800

> However, in that case you'll now have two locks bouncing around
> instead of one and my guess would be that the cache overhead
> would offset any gain that is made from the parallel processing.

The premise is that there'd be only one.  The qdisc lock.

If the traffic is distributed, flow wise, the driver XMIT
lock would spread due to multiqueue.
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