linux-kernel - Re: Kernel panic - not syncing: Attempted to kill the idle task!

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Message-ID: <1339519530.31548.88.camel@twins>
Date:	Tue, 12 Jun 2012 18:45:30 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	hi3766691@...il.com, Hillf Danton <dhillf@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Zhouping Liu <zliu@...hat.com>
Subject: Re: Kernel panic - not syncing: Attempted to kill the idle task!

On Tue, 2012-06-12 at 13:20 +0300, Linus Torvalds wrote:
> you are very fundamentally wrong if you think the distance array has
> to be symmetric. 

I just checked, both QPI and HT are bi-directional links so anything
mid-sized x86 had better be symmetric. Big numa can of course stick in
their own interconnects and might do uni-directional stuff, although I
doubt anybody still does that.

The distance table I have for a 4096 cpu SGI machine is fully symmetric
for instance.

This of course doesn't mean we should make hard assumptions about this
in the scheduler -- and we don't. But in this case it does mean the HP
table is very funny indeed.
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