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Date: Fri, 29 Mar 2002 10:45:18 -0500 (EST)
From: Bill Davidsen <davidsen@tmr.com>
To: Andrew Morton <akpm@zip.com.au>
cc: lkml <linux-kernel@vger.kernel.org>
Subject: Re: [patch] ext2_fill_super breakage
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On Thu, 28 Mar 2002, Andrew Morton wrote:

> BTW, ext3 keeps a kdev_t on-disk for external journals.  The
> external journal support is experimental, added to allow people
> to evaluate the usefulness of external journalling.  If we
> decide to retain the capability we'll be moving it to a UUID
> or mount-based scheme.  So if the kdev_t is being a problem,
> I think we can just break it.

  If experience on JFS is any predictor, the external journal will be
quite useful as a performance issue. It can be put on a faster device to
avoid bottlenecks. With JFS I finally wound up with the journal on a
battery-backed SCSI solid state disk, and got about 30% faster completion
of my daily audit run which deleted ~1000000 (yes one million) files as
fast as it could when done.

  I was also creating the same number of files over the course of a day,
which is still a respectable directory change rate!

  I predict that applications which create/delete a lot of files will run
better with tuning this feature.

-- 
bill davidsen <davidsen@tmr.com>
  CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.

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