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

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Message-ID: <20090725115309.GB3086@ami.dom.local>
Date:	Sat, 25 Jul 2009 13:53:09 +0200
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Krishna Kumar2 <krkumar2@...ibm.com>, davem@...emloft.net,
	netdev@...r.kernel.org
Subject: Re: [RFC] [PATCH] Don't run __qdisc_run() on a stopped TX queue

On Sat, Jul 25, 2009 at 07:12:07PM +0800, Herbert Xu wrote:
> On Sat, Jul 25, 2009 at 01:04:09PM +0200, Jarek Poplawski wrote:
> > 
> > It would be nice to establish what difference is made by each part of
> > this patch. The check for stopped queue before each skb xmit was done
> > earlier too, so it's not exactly multiqueue penalization.
> 
> No, but getting into qdisc_restart when we know that the queue is
> stopped is just silly.  The only reason that is done right now is
> because of the pathological case where a packet on qdisc X maps to
> hardware queue Y.  This is something which almost nobody uses and
> yet it penalises everybody.

Hmm... I agree with you 100%! (I'd only like to see more digits... ;-)

Cheers,
Jarek P.
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