netdev - Re: [PATCH take 2] pkt_sched: Fix qdisc_watchdog() vs. dev

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Message-ID: <20080915060758.GA4112@ff.dom.local>
Date:	Mon, 15 Sep 2008 06:07:58 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Alexander Duyck <alexander.duyck@...il.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	kaber@...sh.net
Subject: Re: [PATCH take 2] pkt_sched: Fix qdisc_watchdog() vs.
	dev_deactivate() race

On Sun, Sep 14, 2008 at 03:13:41PM -0700, Herbert Xu wrote:
> On Sun, Sep 14, 2008 at 11:43:31PM +0200, Jarek Poplawski wrote:
> >
> > On the other hand, I wondered about a possibility of rehashing to other
> > queues in some cases during requeuing, which would be impossible after
> > such change.
> 
> Why would you want to do that? Just because people have abused
> requeue in the psat doesn't mean that we need to support such
> abuses for perpetuity.

Well, it was only wondering, and probably you are right this is wrong.
On the other hand, simple_tx_hash() choices are "probabilistic": user
doesn't care if it goes through tx_queue #1 or #11. And here, in some
cases, some tx_queues could be always full while other always empty,
so some dynamic rehashing could be thought of, but I understand it's
not trivial.
 
Cheers,
Jarek P.
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