linux-kernel - Re: idle issues running sembench on 128 cpus

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Date:	Thu, 5 May 2011 01:51:48 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Andi Kleen <andi@...stfloor.org>
cc:	Dave Kleikamp <dkleikamp@...il.com>,
	Chris Mason <chris.mason@...cle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Tim Chen <tim.c.chen@...ux.intel.com>,
	linux-kernel@...r.kernel.org, lenb@...nel.org, paulmck@...ibm.com
Subject: Re: idle issues running sembench on 128 cpus

On Wed, 4 May 2011, Andi Kleen wrote:

> Thomas Gleixner <tglx@...utronix.de> writes:
> 
> > On Thu, 5 May 2011, Andi Kleen wrote:
> >> On Thu, May 05, 2011 at 01:29:49AM +0200, Thomas Gleixner wrote:
> >> > That makes sense, but merging the timeouts race free will be a real
> >> > PITA.
> >> 
> >> For this case one could actually use a spinlock between the siblings.
> >> That shouldn't be a problem as long as it's not a global spinlock.
> >
> > Care to give it a try ?
> 
> Ok, will try tomorrow.
> 
> >> Here's a new patch without the raw. Boots on my Westmere.
> >
> >> +	cpu = raw_smp_processor_id();
> >
> > Hmm. quilt refresh perhaps ? I know that feeling :)
> 
> The scp to copy the patch was too slow. Noticed it later and sent a new
> one.

NP. Happens to hit everybody from time to time :)

Thanks,

	tglx
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