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

[Peter Zijlstra]

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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