netdev - Re: 2.6.24 BUG: soft lockup

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Message-ID: <20080328145634.GA24712@gondor.apana.org.au>
Date:	Fri, 28 Mar 2008 22:56:34 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Jarek Poplawski <jarkao2@...il.com>
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 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.

> question is how much cache problem is such enqueuing from other CPUs.

It's pretty bad actually.  In fact multiple TX queues isn't
going to be useful until we address this bottle-neck.

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