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

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Message-ID: <Pine.LNX.4.64.0704270507110.21003@schroedinger.engr.sgi.com>
Date:	Fri, 27 Apr 2007 05:12:05 -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:

> For the TLB issue, higher order pagecache doesn't help. If distros
> ship with a 4K page size on powerpc, and use some larger pages in
> the pagecache, some people are still going to get angry because
> they wanted to use 64K pages... But I agree 64K pages is too big
> for most things anyway, and 16 would be better as a default (which
> hopefully x86-64 will get one day).

Powerpc supports multiple pagesizes. Maybe we could make mmap use those 
page sizes some day if we had a variable order page cache. Your stands on 
the issue means that powerpc will be forever crippled and not be able to 
use its full potential.

> Anyway, for io performance, there are alternatives, dispite what
> some people seem to be saying. We can submit larger sglists to the
> device for larger ios, which Jens is looking at (which could help
> all types of workloads, not just those with sequential large file
> IO).

Right this could help but it is not addressing the basic requirement for
devices that need large contiguuos chunks of memory for I/O.
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