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From: Daniel Phillips <phillips@bonn-fries.net>
To: Christian Laursen <xi@borderworlds.dk>
Subject: Re: Ext2 directory index, updated
Date: Tue, 6 Nov 2001 00:13:12 +0100
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In-Reply-To: <20011104022659Z16995-4784+750@humbolt.nl.linux.org> <20011105014225Z17055-18972+38@humbolt.nl.linux.org> <m3n120x1re.fsf@borg.borderworlds.dk>
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On November 5, 2001 11:59 pm, Christian Laursen wrote:
> Daniel Phillips <phillips@bonn-fries.net> writes:
> 
> > On November 4, 2001 11:09 pm, Christian Laursen wrote:
> > > Daniel Phillips <phillips@bonn-fries.net> writes:
> > > 
> > > > ***N.B.: still for use on test partitions only.***
> > > 
> > > It's the first time, I've tried this patch and I must say, that
> > > the first impression is very good indeed.
> > > 
> > > I took a real world directory (my linux-kernel MH folder containing
> > > roughly 115000 files) and did a 'du -s' on it.
> > > 
> > > Without the patch it took a little more than 20 minutes to complete.
> > > 
> > > With the patch, it took less than 20 seconds. (And that was inside uml)
> > 
> > Which kernel are you using?
> 
> Actually, it was on a 2.2.20 kernel.

Yes, it's cool you can run 2.4 uml kernels on 2.2, isn't it?  What I meant 
was, which kernel is your uml built on?

> > From 2.4.10 on ext2 has an accelerator in 
> > ext2_find_entry - it caches the last lookup position.  I'm wondering how 
> > that affects this case.
> 
> From the description I read a while ago, I believe it could cause a
> significant speedup.
> 
> I'll have to try that out one of these days.

I noticed split results with the find_entry accelerator, at least in its 
current form: faster delete, slower create.

--
Daniel
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