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

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Message-ID: <20070426155840.GU31925@holomorphy.com>
Date:	Thu, 26 Apr 2007 08:58:40 -0700
From:	William Lee Irwin III <wli@...omorphy.com>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	David Chinner <dgc@....com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>, clameter@....com,
	linux-kernel@...r.kernel.org, Mel Gorman <mel@...net.ie>,
	Jens Axboe <jens.axboe@...cle.com>,
	Badari Pulavarty <pbadari@...il.com>,
	Maxim Levitsky <maximlevitsky@...il.com>
Subject: Re: [00/17] Large Blocksize Support V3

On Fri, Apr 27, 2007 at 01:38:30AM +1000, Nick Piggin wrote:
> Or good grounds to increase the sg limit and push for io controller
> manufacturers to do the same. If we have a hack in the kernel that
> mostly works, they won't.

On Fri, Apr 27, 2007 at 01:38:30AM +1000, Nick Piggin wrote:
> Page colouring was always rejected, and lots of people who knew
> better got upset because it was the only way the hardware would go
> fast...

Yes, stunning wisdom there. Reject the speedups.


On Fri, Apr 27, 2007 at 01:38:30AM +1000, Nick Piggin wrote:
> You could put it that way. Or that it is wrong because of the
> fragmenatation problem. Realise that it is somewhat fundamental
> considering that it is basically an unsolvable problem with our
> current kernel assumptions of unconstrained kernel allocations and
> a 1:1 kernel mapping.

Depends on what you consider a solution. A broadly used criterion is
that improves performance significantly in important usage cases.


-- wli
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