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Re: Directories > 2GB

To: Steve Lord <lord@xxxxxxx>
Subject: Re: Directories > 2GB
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Tue, 10 Oct 2006 10:19:04 +0100
Cc: David Chinner <dgc@xxxxxxx>, linux-fsdevel@xxxxxxxxxxxxxxx, linux-ext4@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx
In-reply-to: <452B0240.60203@xfs.org>
Mail-followup-to: Christoph Hellwig <hch@xxxxxxxxxxxxx>, Steve Lord <lord@xxxxxxx>, David Chinner <dgc@xxxxxxx>, linux-fsdevel@xxxxxxxxxxxxxxx, linux-ext4@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx
References: <20061004165655.GD22010@schatzie.adilger.int> <452AC4BE.6090905@xfs.org> <20061010015512.GQ11034@melbourne.sgi.com> <452B0240.60203@xfs.org>
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On Mon, Oct 09, 2006 at 09:15:28PM -0500, Steve Lord wrote:
> Hi Dave,
> 
> My recollection is that it used to default to on, it was disabled
> because it needs to map the buffer into a single contiguous chunk
> of kernel memory. This was placing a lot of pressure on the memory
> remapping code, so we made it not default to on as reworking the
> code to deal with non contig memory was looking like a major
> effort.

Exactly.  The code works but tends to go OOM pretty fast at least
when the dir blocksize code is bigger than the page size.  I should
give the code a spin on my ppc box with 64k pages if it works better
there.


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