linux-kernel - Re: [00/41] Large Blocksize Support V7 (adds memmap support)

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Date:	Wed, 19 Sep 2007 12:45:32 +1000
From:	Nathan Scott <nscott@...nex.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrea Arcangeli <andrea@...e.de>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Christoph Lameter <clameter@....com>,
	Mel Gorman <mel@...net.ie>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>,
	William Lee Irwin III <wli@...omorphy.com>,
	David Chinner <dgc@....com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Badari Pulavarty <pbadari@...il.com>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	Fengguang Wu <fengguang.wu@...il.com>,
	swin wang <wangswin@...il.com>, totty.lu@...il.com,
	hugh@...itas.com, joern@...ybastard.org
Subject: Re: [00/41] Large Blocksize Support V7 (adds memmap support)

On Tue, 2007-09-18 at 18:06 -0700, Linus Torvalds wrote:
> There is *no* valid reason for 16kB blocksizes unless you have legacy 
> issues.

That's not correct.

> The performance issues have nothing to do with the block-size, and 

We must be thinking of different performance issues.

> should be solvable by just making sure that your stupid "state of the
> art" 
> crap SCSI controller gets contiguous physical memory, which is best
> done 
> in the read-ahead code. 

SCSI controllers have nothing to do with improving ondisk layout, which
is the performance issue I've been referring to.

cheers.

--
Nathan

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