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

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Message-ID: <Pine.LNX.4.64.0704260022570.31003@schroedinger.engr.sgi.com>
Date:	Thu, 26 Apr 2007 00:28:03 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Nick Piggin <nickpiggin@...oo.com.au>
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

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.

Lets be clear here: A bigger page cache size if its just one is not 
useful. 4k page size is a good size for many files on the system and 
chaning it would break the binary format.. I just do not want it to be the 
only one because different usage scenarios may require differnet page 
sizes for optimal application performance.

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