linux-kernel - Re: [RFC][PATCH 1/2] sched: higher granularity load on 64bit systems

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Date:	Thu, 24 Apr 2008 07:28:14 +0530
From:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
To:	David Miller <davem@...emloft.net>
Cc:	a.p.zijlstra@...llo.nl, mingo@...e.hu, vatsa@...ibm.com,
	dmitry.adamushko@...il.com, efault@....de,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH 1/2] sched: higher granularity load on 64bit
	systems

On Wed, Apr 23, 2008 at 05:27:10PM -0700, David Miller wrote:
> From: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Date: Thu, 24 Apr 2008 00:07:56 +0200
> 
> > The below is an RFC because for some reason it regresses kbuild by 5% on
> > my machine (and more on the largesmp that are the reason for it).
> 
> This causes my 64-cpu Niagara2 box to completely hang when I run "make
> clean" on a kernel tree after a fresh bootup.
> 

Any traces? Or anything? It stayed pretty stable on the 128 way I trying
on, (but for the performance regression) and I was able to reproduce
your group scheduler hang (or so i think, it might a separate one
altogether.)

> Can we just revert all of this broken code until it's sorted out? :-/
> 
> We're going on 4 days with unfixed major regressions from the
> scheduler tree merge, and these regressions make systems unusable.
> 
> This is blocking my own work, and I'm starting to lose my patience.

-- 
regards,
Dhaval
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