netdev - Re: Kernel WARNING: at net/core/dev.c:1330 __netif

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Date:	Thu, 24 Jul 2008 12:08:56 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	David Miller <davem@...emloft.net>
Cc:	jarkao2@...il.com, Larry.Finger@...inger.net, kaber@...sh.net,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-wireless@...r.kernel.org, mingo@...hat.com,
	nickpiggin@...oo.com.au, paulmck@...ux.vnet.ibm.com
Subject: Re: Kernel WARNING: at net/core/dev.c:1330
	__netif_schedule+0x2c/0x98()

On Thu, 2008-07-24 at 02:32 -0700, David Miller wrote:
> From: Peter Zijlstra <peterz@...radead.org>
> Date: Thu, 24 Jul 2008 11:27:05 +0200
> 
> > Well, not only lockdep, taking a very large number of locks is expensive
> > as well.
> 
> Right now it would be on the order of 16 or 32 for
> real hardware.
> 
> Much less than the scheduler currently takes on some
> of my systems, so currently you are the pot calling the
> kettle black. :-)

One nit, and then I'll let this issue rest :-)

The scheduler has a long lock dependancy chain (nr_cpu_ids rq locks),
but it never takes all of them at the same time. Any one code path will
at most hold two rq locks.



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