linux-kernel - Re: Ubuntu 32-bit, 32-bit PAE, 64-bit Kernel Benchmarks

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Message-ID: <20100116123313.GA20059@sucs.org>
Date:	Sat, 16 Jan 2010 12:33:13 +0000
From:	Sitsofe Wheeler <sitsofe@...oo.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Yuhong Bao <yuhongbao_386@...mail.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	mingo@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: Ubuntu 32-bit, 32-bit PAE, 64-bit Kernel Benchmarks

On Fri, Jan 15, 2010 at 05:49:06PM -0800, H. Peter Anvin wrote:
> On 12/30/2009 05:29 PM, Yuhong Bao wrote:
> > 
> > Given that Linus was once talking about the performance penalties of
> > PAE and HIGHMEM64G, perhaps you'd find these benchmarks done by
> > Phoronix of interest:
> > http://www.phoronix.com/scan.php?page=article&item=ubuntu_32_pae
> > 
> 
> The big difference isn't between HIGHMEM4G (no PAE) and HIGHMEM64G
> (PAE), it's between HIGHMEM and !HIGHMEM.  That cutoff is ~892 MB for a
> stock 32-bit kernel.

Thanks for the clarification - I had been wondering about why those
settings had been benchmarked against each other...

I took a mild interest because I have an EeePC 900 with 1G of RAM. The
machine can do PAE but my understanding is that this would lead to a
performance drop (I currently have VMSPLIT_3G so I can use all 1G of
memory) so I run it without HIGHMEM.

-- 
Sitsofe | http://sucs.org/~sits/
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