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

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Date:	Sun, 26 Nov 2006 21:49:36 +0100
From:	Andi Kleen <ak@...e.de>
To:	Amul Shah <amul.shah@...sys.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Eric Dumazet <dada1@...mosbay.com>
Subject: Re: [PATCH] x86_64: Make the NUMA hash function nodemap allocation dynamic and remove NODEMAPSIZE

On Wednesday 15 November 2006 22:48, Amul Shah wrote:
> This patch removes the statically allocated memory to NUMA node hash map
> in favor of a dynamically allocated memory to node hash map (it is cache
> aligned).
> 
> This patch has the nice side effect in that it allows the hash map to
> grow for systems with large amounts of memory (256GB - 1TB), but suffer
> from having small PCI space tacked onto the boot node (which is
> somewhere between 192MB to 512MB on the ES7000).
> 
> Signed-off-by: Amul Shah <amul.shah@...sys.com>
> 
> ---
> Patch applies to 2.6.19-rc4 and has been tested.
> This patch needs testing on a K8 NUMA platform.
> Thanks to Eric Dumazet and Andi Kleen for their improvement suggestions.

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.

BIOS-provided physical RAM map:
 BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
 BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
 BIOS-e820: 00000000000e6000 - 0000000000100000 (reserved)
 BIOS-e820: 0000000000100000 - 000000003ef30000 (usable)
 BIOS-e820: 000000003ef30000 - 000000003ef40000 (ACPI data)
 BIOS-e820: 000000003ef40000 - 000000003eff0000 (ACPI NVS)
 BIOS-e820: 000000003eff0000 - 000000003f000000 (reserved)
 BIOS-e820: 00000000fecf0000 - 00000000fecf1000 (reserved)
 BIOS-e820: 00000000fed20000 - 00000000feda0000 (reserved)
end_pfn_map = 1043872
kernel direct mapping tables up to feda0000 @ 8000-d000
DMI 2.3 present.
No NUMA configuration found
Faking a node at 0000000000000000-000000003ef30000
<triple fault>

-Andi
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