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

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Message-ID: <20080911110035.GA22065@gondor.apana.org.au>
Date:	Thu, 11 Sep 2008 21:00:35 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	David Miller <davem@...emloft.net>
Cc:	jarkao2@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH take 2] pkt_sched: Fix qdisc_watchdog() vs.
	dev_deactivate() race

On Thu, Sep 11, 2008 at 03:49:55AM -0700, David Miller wrote:
> 
> Well some kind of check has to be there.
> 
> I _did_ remove it during my initial implementation, and that
> turned into a reported performance regression.

I see.  How about looking at the queue that the head-of-qdisc
packet maps to? That should be fairly cheap to compute.

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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