On Mon, Sep 23, 2002 at 01:28:56PM +0200, Marc-Christian Petersen wrote: > On Monday 23 September 2002 01:33, Theodore Ts'o wrote: > > Hi Theodore, > > > These times don't look right. Are you sure you created the filesystem > > was using directorying indexing turned on? With it turned on, > > creating 100,000 files should take 10-20 seconds depending on the > > speed of your system and hard disks. > hmm, I thought this will also work if I just mount with index option on my > already working filesystems. But I was wrong, obviously. I've never liked the index mount option, and I'm going to be taking that out of the patch that I send to Linus. It's just too confusing, and its effects were not what I would consider consistent. > Can you tell me why this only works with new created filesystems with index > and not with already created filesystems just using the index mount option? It works with already created filesystems, but just don't use the index mount option. As I said, it confuses people.... If you want to convert any filesystem to use directory indexing, all you need to do is use the following commands: debugfs -w -R "features dir_index" /dev/hdXXX debugfs -w -R "ssv def_hash_version tea" /dev/hdXXX debugfs -w -R "ssv hash_seed random" /dev/hdXXX or if you prefer... % debugfs -w test.img debugfs: features dir_index debugfs: ssv def_hash_version tea debugfs: ssv hash_seed random debugfs: quit With the soon-to-be-released e2fsprogs 1.29, you'll be able to do this via the single command: tune2fs -O dir_index /dev/hdXXX ... but this won't work e2fsprogs 1.28. You will need to remount the filesystem before the dir_index option will take effect. (Umount followed by mount will definitely work. Using mount -o remount should work, but I haven't had a chance to test that kernel code path yet.) > > On my system, creating the files in the test3 directory takes 11.408 > > seconds real time, with 6.221 seconds of system time with the > > directory indexing. If I comment out the debugfs line which activates > > the "dir_index" filesystem feature flag, then directory indexing is > > turned off, and the script takes 38:07 minutes of real time, with > > 38:05 of it being system time. > jep, exakt. with index, your script took 15 seconds! FAAST :) Well, yes, that's the point of the dir_index feature. :-) - Ted _______________________________________________ Ext3-users@redhat.com https://listman.redhat.com/mailman/listinfo/ext3-users
