On Tue, Jan 09, 2007 at 08:23:32AM -0800, Linus Torvalds wrote: > > > 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? Yes, a trivial test shows a marginal improvement, on a minimal debian system: # find / | wc -l 13641 # time find / > /dev/null real 0m10.000s user 0m0.210s sys 0m4.370s # time find / > /dev/null real 0m9.890s user 0m0.160s sys 0m3.270s > Doing an > > echo 3 > /proc/sys/vm/drop_caches > > is your friend for testing things like this, to force cold-cache > behaviour.. Thanks, I'll work out numbers on large/concurrent dir accesses soon. Regards, Wu - To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
