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

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Date:	Thu, 26 Apr 2007 17:45:24 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Christoph Lameter <clameter@....com>
CC:	David Chinner <dgc@....com>,
	"Eric W. Biederman" <ebiederm@...ssion.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

Christoph Lameter wrote:
> On Thu, 26 Apr 2007, Nick Piggin wrote:
> 
> 
>>But I maintain that the end result is better than the fragmentation
>>based approach. A lot of people don't actually want a bigger page
>>cache size, because they want efficient internal fragmentation as
>>well, so your radix-tree based approach isn't really comparable.
> 
> 
> Me? Radix tree based approach? That approach is in the kernel. Do not 
> create a solution where there is no problem. If we do not want to 
> support large blocksizes then lets be honest and say so instead of 
> redefining what a block is. The current approach is fine if one is 
> satisfied with scatter gather and the VM overhead coming with handling 
> these pages. I fail to see what any of what you are proposing would add to 
> that.

I'm not just making this up. Fragmentation. OK?

-- 
SUSE Labs, Novell Inc.
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