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

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Date:	Thu, 26 Apr 2007 18:05:07 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Christoph Hellwig <hch@...radead.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Christoph Lameter <clameter@....com>,
	linux-kernel@...r.kernel.org, Mel Gorman <mel@...net.ie>,
	William Lee Irwin III <wli@...omorphy.com>,
	David Chinner <dgc@....com>,
	Badari Pulavarty <pbadari@...il.com>,
	Maxim Levitsky <maximlevitsky@...il.com>
Subject: Re: [00/17] Large Blocksize Support V3

On Thu, Apr 26 2007, Christoph Hellwig wrote:
> On Thu, Apr 26, 2007 at 04:38:54PM +1000, Nick Piggin wrote:
> > Hardware is built to handle many small pages efficintly, and I don't
> > understand how it could be an SGI-only issue. Sure, you may have an
> > order of magnitude or more memory than anyone else, but even my lowly
> > desktop _already_ has orders of magnitude more pages than it has TLB
> > entries or cache -- if a workload is cache-nice for me, it probably
> > will be on a 1TB machine as well, and if it is bad for the 1TB machine,
> > it is also bad on mine.
> 
> It's not an SGI-only issue, but apparently SGI are the only ones
> that actually care about real highend linux setups to work on these
> issues.  The Problem is not on the CPU hardware side.  It's on
> the Software side and Storage hardware side, or rather a combination
> of the two.

Agree. I don't know why we are arguing the merrits of this, it's an
obvious win. The problem is more if it's doable this way or not due to
fragmentation, but that's a different discussion and should be kept
seperate.

-- 
Jens Axboe

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