From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: hi3766691@gmail.com, Hillf Danton <dhillf@gmail.com>,
LKML <linux-kernel@vger.kernel.org>,
Andrea Arcangeli <aarcange@redhat.com>,
Zhouping Liu <zliu@redhat.com>
Subject: Re: Kernel panic - not syncing: Attempted to kill the idle task!
Date: Tue, 12 Jun 2012 18:45:30 +0200 [thread overview]
Message-ID: <1339519530.31548.88.camel@twins> (raw)
In-Reply-To: <CA+55aFw=akW7B+vRkQRMojnP6_b1YXdKpNEjQ2EyBHcTe2_XLw@mail.gmail.com>
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.
prev parent reply other threads:[~2012-06-12 16:45 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-08 17:13 Kernel panic - not syncing: Attempted to kill the idle task! ZhouPing Liu
2012-06-08 18:46 ` Peter Zijlstra
2012-06-09 1:38 ` Zhouping Liu
2012-06-11 13:27 ` Peter Zijlstra
2012-06-11 13:51 ` Borislav Petkov
2012-06-12 3:54 ` Zhouping Liu
2012-06-12 6:39 ` Zhouping Liu
2012-06-12 8:49 ` Peter Zijlstra
[not found] ` <CA+55aFw=akW7B+vRkQRMojnP6_b1YXdKpNEjQ2EyBHcTe2_XLw@mail.gmail.com>
2012-06-12 10:27 ` Peter Zijlstra
2012-06-12 11:08 ` Peter Zijlstra
2012-06-12 16:45 ` Peter Zijlstra [this message]
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