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) _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
