linux-kernel - Re: [2.6.20.16 review 08/28] x86_64: allocate sparsemem memmap above 4G

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Message-Id: <200708121218.12411.ak@suse.de>
Date:	Sun, 12 Aug 2007 12:18:11 +0200
From:	Andi Kleen <ak@...e.de>
To:	Willy Tarreau <w@....eu>
Cc:	linux-kernel@...r.kernel.org, stable@...nel.org,
	Zou Nan hai <nanhai.zou@...el.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Chris Wright <chrisw@...s-sol.org>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: [2.6.20.16 review 08/28] x86_64: allocate sparsemem memmap above 4G

On Saturday 11 August 2007 21:48, Willy Tarreau wrote:
> On systems with huge amount of physical memory, VFS cache and memory memmap
> may eat all available system memory under 4G, then the system may fail to
> allocate swiotlb bounce buffer.
>
> There was a fix for this issue in arch/x86_64/mm/numa.c, but that fix dose
> not cover sparsemem model.

Have you checked if sparsemem even worked in 2.6.20? Irc it was quite
unstable a couple of releases ago. There were times where it rarely
booted on x86-64 because so few people test it. 
If not the patch is not needed, although relatively harmless too.

-Andi
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