linux-kernel - Re: [PATCH] x86_64: Make the NUMA hash function nodemap allocation dynamic and remove NODEMAPSIZE

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Message-Id: <1164641576.3227.12.camel@ustr-linux-shaha1.unisys.com>
Date:	Mon, 27 Nov 2006 10:32:56 -0500
From:	Amul Shah <amul.shah@...sys.com>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Andi Kleen <ak@...e.de>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86_64: Make the NUMA hash function nodemap allocation
	dynamic and remove NODEMAPSIZE

On Mon, 2006-11-27 at 11:23 +0100, Eric Dumazet wrote:
> On Sunday 26 November 2006 21:49, Andi Kleen wrote:
> > I had the patch in, but had to drop it again because it makes one of my
> > test system triple fault. Haven't done much investigation yet.
> >
> > No NUMA configuration found
> > Faking a node at 0000000000000000-000000003ef30000
> > <triple fault>
> >
> 
> Well, I dont have currently an AMD64 test machine so I cannot really help.
> 
> With previous implementation, the nimimum shift value was 20 (one megabytes)
> 
> If a memnode had a finer range (with chunks not multiple of megabytes), some 
> bits of memory could be ignored.
> 
> But with your fake node (0-3ef30000), Amul patch may give a shift value of 16.
>  Maybe this breaks something in the kernel...

I believe that this problem is related to a new patch that enhances the
fake NUMA code (see http://article.gmane.org/gmane.linux.kernel/469457).
I'll work with the submitter of said patches to make them compatible.
Hopefully that will fix the problem.

thanks,
Amul

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