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Message-ID: <4631F55C.2040800@yahoo.com.au>
Date: Fri, 27 Apr 2007 23:06:36 +1000
From: Nick Piggin <nickpiggin@yahoo.com.au>
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To: William Lee Irwin III <wli@holomorphy.com>
CC: "Eric W. Biederman" <ebiederm@xmission.com>,
       Christoph Lameter <clameter@sgi.com>, linux-kernel@vger.kernel.org,
       Mel Gorman <mel@skynet.ie>, David Chinner <dgc@sgi.com>,
       Jens Axboe <jens.axboe@oracle.com>,
       Badari Pulavarty <pbadari@gmail.com>,
       Maxim Levitsky <maximlevitsky@gmail.com>
Subject: Re: [00/17] Large Blocksize Support V3
References: <Pine.LNX.4.64.0704252337390.30340@schroedinger.engr.sgi.com> <46304C74.9040304@yahoo.com.au> <Pine.LNX.4.64.0704260003450.30731@schroedinger.engr.sgi.com> <46305177.7060102@yahoo.com.au> <Pine.LNX.4.64.0704260017430.31003@schroedinger.engr.sgi.com> <463057D9.9030804@yahoo.com.au> <20070426145310.GH19966@holomorphy.com> <m1ejm7kndn.fsf@ebiederm.dsl.xmission.com> <20070427003216.GM19966@holomorphy.com> <4631CECF.4030301@yahoo.com.au> <20070427125843.GO19966@holomorphy.com>
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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.