Subject: Re: Kernel WARNING: at net/core/dev.c:1330 __netif_schedule+0x2c/0x98()

From: Peter Zijlstra <[email-masked]>
Date: Thu, 24 Jul 2008 12:08:56 +0200

On Thu, 2008-07-24 at 02:32 -0700, David Miller wrote:
> From: Peter Zijlstra <[email-masked]>
> 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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