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

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Message-ID: <20070426202202.GI16909@skynet.ie>
Date:	Thu, 26 Apr 2007 21:22:02 +0100
From:	mel@...net.ie (Mel Gorman)
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Christoph Lameter <clameter@....com>,
	Christoph Hellwig <hch@...radead.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	David Chinner <dgc@....com>, linux-kernel@...r.kernel.org,
	William Lee Irwin III <wli@...omorphy.com>,
	Badari Pulavarty <pbadari@...il.com>,
	Maxim Levitsky <maximlevitsky@...il.com>
Subject: Re: [00/17] Large Blocksize Support V3

On (26/04/07 20:39), Jens Axboe didst pronounce:
> On Thu, Apr 26 2007, Christoph Lameter wrote:
> > On Thu, 26 Apr 2007, Jens Axboe wrote:
> > 
> > > On Thu, Apr 26 2007, Christoph Lameter wrote:
> > > > On Thu, 26 Apr 2007, Jens Axboe wrote:
> > > > 
> > > > > The above can be implemented fairly cleanly, and on a need-to-have
> > > > > basis. It's not something that'll break drivers.
> > > > 
> > > > But its also not going to fix the hacks that we have in the kernel 
> > > > to deal with > PAGE_SIZE i/o.
> > > 
> > > No, but that's a _seperate_ issue! Don't keep mixing up the two.
> > 
> > Yes I understand that you want it to be a separate issue so we get get 
> > more rationales for the hacks that we do to avoid the large 
> > order allocations.
> 
> Christoph, don't take your frustrations out on me. I've several times in
> this thread said that I'd LIKE to have > PAGE_SIZE support in the page
> cache. I WROTE the initial pktcdvd driver that is a primary example of
> these hacks, I'm very well aware of the pain and bugs involved with
> that.
> 
> But don't push large pages as the only solution to larger ios, because
> that is trivially not true.
> 

Would it be fair to say that your approach and using large pages are not
mutually exclusive solutions? It seems a lot of the debate here is
assuming there is One And Only One Solution for larger ios.

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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