netdev - Re: 2.6.24 BUG: soft lockup

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Message-ID: <20080328152953.GB14642@ami.dom.local>
Date:	Fri, 28 Mar 2008 16:29:53 +0100
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Matheos Worku <Matheos.Worku@....COM>,
	David Miller <davem@...emloft.net>, jesse.brandeburg@...el.com,
	netdev@...r.kernel.org, hadi@...erus.ca
Subject: Re: 2.6.24 BUG: soft lockup - CPU#X

On Fri, Mar 28, 2008 at 10:56:34PM +0800, Herbert Xu wrote:
> On Fri, Mar 28, 2008 at 03:39:53PM +0100, Jarek Poplawski wrote:
> > 
> > Probably some backlog would be necessary, similarly to RX. The main
> 
> Sorry but I still don't understand how this would differ from
> what we do now.  As it stands the packet would be queued for
> later processing if another CPU is doing a qdisc run.

But during this, now limited, time of qdisc_run() there is a contention
for queue_lock and probably some additional cache updating because of
this other enqueuing, which could be delayed especially if queue length
is above some level.

Cheers,
Jarek P.
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