linux-kernel - Re: [PATCH 0/11] Avoiding fragmentation with subzone groupings v26

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Date:	02 Nov 2006 05:04:57 +0100
From:	Andi Kleen <ak@...e.de>
To:	Mel Gorman <mel@....ul.ie>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/11] Avoiding fragmentation with subzone groupings v26

Mel Gorman <mel@....ul.ie> writes:
> 
> Our tests show that about 60-70% of physical memory can be allocated on
> a desktop after a few days uptime. In benchmarks and stress tests, we are
> finding that 80% of memory is available as contiguous blocks at the end of
> the test. To compare, a standard kernel was getting < 1% of memory as large
> pages on a desktop and about 8-12% of memory as large pages at the end of
> stress tests.

If you don't have a fixed limit on the unreclaimable memory you could
still get into a situation where all memory is fragmented and unreclaimable,
right?

It might be much harder to hit, but we have so many users that at least
a few will eventually.

> Performance tests are within 0.1% for kbuild on a number of test machines. aim9
> is usually within 1% 

1% is a lot.

-Andi
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