On Fri, Jul 25, 2014 at 6:23 PM, Arlie Stephens <arlie@xxxxxxxxxxxx> wrote: > On Jul 25 2014, Nick Krause wrote: >> > But if nothing like that is jumping out at you, maybe you should go look >> > around and see if there's something in userspace that *does* jump out at you. >> >> I am interested in file systems and will be working on brtfs and ext4. >> Cheers Nick > > If you want an annoying problem, explain and/or fix directory > performance on ext4. I've got a server where an ls of a directory took > 5 seconds, according to "time", even though it only has 295 entries at > present. > > It's a rather large directory, 4 times the size of a normal directory > in the opinion of ls -ld, and filefrag reports it has 7 extents. > > I'm also getting anecdotal reports of rename() taking unreasonable > amounts of time, probably with at least one of the directories > involved being in a similar state. (They would have been created and > populated by the same software.) > > Probably the directory had a large number of files and/or > subdirectories some time in the past, and this is "expected > behaviour". Expected or not, it seems to me that it's about time that > linux handles directories with something closer to the efficiency with > which it handles files ;-) > > -- > Arlie > > (Arlie Stephens arlie@xxxxxxxxxxxx) Sure Arlie, I don't mind helping you out but you have to test this for me as this problem is not happening on my hardware at least :). Cheers Nick _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
