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

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Date:	Tue, 9 Jan 2007 08:23:32 -0800 (PST)
From:	Linus Torvalds <torvalds@...l.org>
To:	Fengguang Wu <fengguang.wu@...il.com>
cc:	Theodore Tso <tytso@....edu>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Andrew Morton <akpm@...l.org>, Willy Tarreau <w@....eu>,
	"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 Tue, 9 Jan 2007, Fengguang Wu 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
> 
> Here's is a quick hack to practice the directory readahead idea.
> Comments are welcome, it's a freshman's work :)

Well, I'd probably have done it differently, but more important is whether 
this actually makes a difference performance-wise. Have you benchmarked it 
at all?

Doing an

	echo 3 > /proc/sys/vm/drop_caches

is your friend for testing things like this, to force cold-cache 
behaviour..

		Linus
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