From: Andi Kleen <ak@suse.de>
To: Mel Gorman <mel@csn.ul.ie>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/11] Avoiding fragmentation with subzone groupings v26
Date: 02 Nov 2006 05:04:57 +0100 [thread overview]
Message-ID: <p734ptilcie.fsf@verdi.suse.de> (raw)
In-Reply-To: <20061101111620.18798.34778.sendpatchset@skynet.skynet.ie>
Mel Gorman <mel@csn.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
next prev parent reply other threads:[~2006-11-02 4:05 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-01 11:16 [PATCH 0/11] Avoiding fragmentation with subzone groupings v26 Mel Gorman
2006-11-01 11:16 ` [PATCH 1/11] Add __GFP_EASYRCLM flag and update callers Mel Gorman
2006-11-01 11:17 ` [PATCH 2/11] Split the free lists into kernel and user parts Mel Gorman
2006-11-01 11:17 ` [PATCH 3/11] Split the per-cpu lists into RCLM_TYPES lists Mel Gorman
2006-11-01 11:17 ` [PATCH 4/11] Add a configure option for anti-fragmentation Mel Gorman
2006-11-01 11:18 ` [PATCH 5/11] Drain per-cpu lists when high-order allocations fail Mel Gorman
2006-11-01 11:18 ` [PATCH 6/11] Move free pages between lists on steal Mel Gorman
2006-11-01 11:18 ` [PATCH 7/11] Introduce the RCLM_KERN allocation type Mel Gorman
2006-11-01 11:19 ` [PATCH 8/11] [DEBUG] Add statistics Mel Gorman
2006-11-01 11:19 ` [PATCH 9/11] Add a bitmap that is used to track flags affecting a block of pages Mel Gorman
2006-11-01 11:19 ` [PATCH 10/11] Remove dependency on page->flag bits Mel Gorman
2006-11-01 11:20 ` [PATCH 11/11] Use pageblock flags for anti-fragmentation Mel Gorman
2006-11-02 4:04 ` Andi Kleen [this message]
2006-11-02 11:21 ` [PATCH 0/11] Avoiding fragmentation with subzone groupings v26 Mel Gorman
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