linux-kernel - Re: [00/17] Large Blocksize Support V3

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Message-ID: <20070427125843.GO19966@holomorphy.com>
Date:	Fri, 27 Apr 2007 05:58:43 -0700
From:	William Lee Irwin III <wli@...omorphy.com>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Christoph Lameter <clameter@....com>,
	linux-kernel@...r.kernel.org, Mel Gorman <mel@...net.ie>,
	David Chinner <dgc@....com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Badari Pulavarty <pbadari@...il.com>,
	Maxim Levitsky <maximlevitsky@...il.com>
Subject: Re: [00/17] Large Blocksize Support V3

William Lee Irwin III wrote:
>> I readily concede that seeks are most costly. Yet memory contiguity
>> remains rather influential.
>> Witness the fact that I'm now being called upon a second time to
>> adjust the order in which mm/page_alloc.c returns pages for the
>> sake of implicitly establishing IO contiguity (or otherwise
>> determining why things are coming out backward now).

On Fri, Apr 27, 2007 at 08:22:07PM +1000, Nick Piggin wrote:
> Just a random aside question... doesn't Oracle db do direct IO from
> hugepages?

If and when configured to use direct IO and hugepages, yes. It's also
noteworthy thar Oracle has more code than its database.


-- wli
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