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

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Message-ID: <m1ejm7kndn.fsf@ebiederm.dsl.xmission.com>
Date:	Thu, 26 Apr 2007 12:21:24 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	William Lee Irwin III <wli@...omorphy.com>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	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 <wli@...omorphy.com> writes:

> On Thu, Apr 26, 2007 at 05:42:17PM +1000, Nick Piggin wrote:
>> Actually, I don't know why people are so excited about being able to
>> use higher order allocations (I would rather be more excited about
>> never having to use them). But for those few places that really need
>> it, I'd rather see them use a virtually mapped kernel with proper
>> defragmentation rather than putting hacks all through the core code.
>
> In memory as on disk, contiguity matters a lot for performance.

Not nearly so much though.  In memory you don't have seeks to avoid.
On disks avoiding seeks is everything.

Eric
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