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

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Message-ID: <Pine.LNX.4.64.0704272047550.7119@schroedinger.engr.sgi.com>
Date:	Fri, 27 Apr 2007 20:49:28 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	David Chinner <dgc@....com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	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>,
	Nick Piggin <nickpiggin@...oo.com.au>
Subject: Re: [00/17] Large Blocksize Support V3

On Sat, 28 Apr 2007, David Chinner wrote:

> > 1-disk and 2-disk read throughput fell by an improbable amount, which makes
> > me cautious about the other numbers.
> 
> For read, yes, and it's because something is going wrong with the
> I/O size - it looks like readahead thrashing of some kind even
> with 4k pages tests.

Yup. I seem to have a problem in that area with my patches. Somehow the
nr of page is shifted by page order. I do not completely understand what 
is going on there yet.

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