linux-ext4 - Re: How git affects kernel.org performance

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Message-ID: <20070108135952.GF25857@elf.ucw.cz>
Date:	Mon, 8 Jan 2007 14:59:52 +0100
From:	Pavel Machek <pavel@....cz>
To:	Theodore Tso <tytso@....edu>, Johannes Stezenbach <js@...uxtv.org>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Andrew Morton <akpm@...l.org>, Willy Tarreau <w@....eu>,
	Linus Torvalds <torvalds@...l.org>,
	"H. Peter Anvin" <hpa@...or.com>, git@...r.kernel.org,
	nigel@...el.suspend2.net, "J.H." <warthog9@...nel.org>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	kernel list <linux-kernel@...r.kernel.org>,
	webmaster@...nel.org,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: How git affects kernel.org performance

Hi!

> > Would e2fsck -D help? What kind of optimization
> > does it perform?
> 
> It will help a little; e2fsck -D compresses the logical view of the
> directory, but it doesn't optimize the physical layout on disk at all,
> and of course, it won't help with the lack of readahead logic.  It's
> possible to improve how e2fsck -D works, at the moment, it's not
> trying to make the directory be contiguous on disk.  What it should
> probably do is to pull a list of all of the blocks used by the
> directory, sort them, and then try to see if it can improve on the
> list by allocating some new blocks that would make the directory more
> contiguous on disk.  I suspect any improvements that would be seen by
> doing this would be second order effects at most, though.

...sounds like a job for e2defrag, not e2fsck...
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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