linux-kernel - Re: divide error in select_task_rq

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Message-ID: <1290123161.2447.27.camel@zim>
Date:	Thu, 18 Nov 2010 16:32:41 -0700
From:	Myron Stowe <myron.stowe@...com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Nikanth Karthikesan <knikanth@...e.de>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Venkatesh Pallipadi <venki@...gle.com>,
	Nikhil Rao <ncrao@...gle.com>,
	Takuya Yoshikawa <yoshikawa.takuya@....ntt.co.jp>,
	linux-kernel@...r.kernel.org, rjenties@...gle.com
Subject: Re: divide error in select_task_rq_fair()

On Sun, 2010-11-14 at 11:11 -0800, Yinghai Lu wrote:
> On Sun, Nov 14, 2010 at 9:36 AM, Myron Stowe <myron.stowe@...com> wrote:
> >
> > I got the same divide error with this latest patch (see attachment).  If
> > I revert commit 50f2d7f682f9, the platform boots successfully.
> 
> please check patch in
> http://lkml.org/lkml/2010/11/13/181

I was able to test this patch and with it applied the system did boot
successfully.

While I think you are on the correct path with respect to this issue I
could not make any sense out of the patch heading and description.
Worse - I'm thinking that it is even mis-leading as currently written
(especially the patch heading).

Thanks,

Myron
> 
> BTW, you also need to ask your BIOS guys to fix the SRAT table.
> If you only have 128 cpu entries in MADT, SRAT table should have 128
> cpu entries instead of 256 cpu entries
> otherwise, RHEL 5.5 could have problem. it will throw away last cpu
> entry in SRAT,
>  (NR_CPUS is 255..., and last entry still could point the right cpu in MADT)
> Also BIOS should keep cpu entries in SRAT have same order to that in MADT.
> 
> Thanks
> 
> Yinghai
> 


-- 
Myron Stowe                             Linux Kernel Developer
Fort Collins, CO                        Office of Corporate Strategy and Technology

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