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

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Message-ID: <4631F55C.2040800@yahoo.com.au>
Date:	Fri, 27 Apr 2007 23:06:36 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	William Lee Irwin III <wli@...omorphy.com>
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:
> 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.

Sweet. I wonder if you would see a much improvement for allowing more
than 128 sglist entries, then.


> It's also
> noteworthy thar Oracle has more code than its database.

Anything noteworthy in this context, that you care to note?

-- 
SUSE Labs, Novell Inc.
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