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

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Message-ID: <20070108134147.GB5291@linuxtv.org>
Date:	Mon, 8 Jan 2007 14:41:47 +0100
From:	Johannes Stezenbach <js@...uxtv.org>
To:	Theodore Tso <tytso@....edu>
Cc:	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>,
	Pavel Machek <pavel@....cz>,
	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

On Mon, Jan 08, 2007 at 07:58:19AM -0500, Theodore Tso wrote:
> 
> The fastest and probably most important thing to add is some readahead
> smarts to directories --- both to the htree and non-htree cases.  If
> you're using some kind of b-tree structure, such as XFS does for
> directories, preallocation doesn't help you much.  Delayed allocation
> can save you if your delayed allocator knows how to structure disk
> blocks so that a btree-traversal is efficient, but I'm guessing the
> biggest reason why we are losing is because we don't have sufficient
> readahead.  This also has the advantage that it will help without
> needing to doing a backup/restore to improve layout.

Would e2fsck -D help? What kind of optimization
does it perform?


Thanks,
Johannes
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