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

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Message-ID: <Pine.LNX.4.64.0704270936220.1534@schroedinger.engr.sgi.com>
Date:	Fri, 27 Apr 2007 09:48:25 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Nick Piggin <nickpiggin@...oo.com.au>
cc:	Paul Mackerras <paulus@...ba.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Chinner <dgc@....com>, linux-kernel@...r.kernel.org,
	Mel Gorman <mel@...net.ie>,
	William Lee Irwin III <wli@...omorphy.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

On Fri, 27 Apr 2007, Nick Piggin wrote:

> Linus's favourite jokes about powerpc mmu being crippled forever, aside ;)
> 
> This seems like just speculation. I would not be against something which,
> without, would "cripple" some relevant hardware, but you are just handwaving
> at this point. And you are still ignoring the alternatives.

This crippling also applies to IA64. The crippling is a concern of 
multiple arches and its effects have been well documented. Talk to Peter 
Chubb for example. The requirement is to be able to do I/O to large 
contiguous sections of memory. Your proposals are ignoring the 
requirements.
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