From: Linus Torvalds Date: Tue, 09 Jan 2007 16:23:32 GMT Subject: Re: How git affects kernel.org performance Message-ID: In-Reply-To: <368329554.17014@ustc.edu.cn> 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