Dushan Tcholich wrote: > I was restructuring my partition layout on some disk where I had plain > R4, and while doing it I deleted some large files. > I was suprised how short delete times were. > So on cc partition I created incompressable file ( as per Edwards > instructions http://marc.info/?l=reiserfs-devel&m=121262617103900&w=2) > and: > > localhost ~ # ls -l /w* > -rw-r--r-- 1 root root 2600005632 Apr 23 10:22 /windows.qcow2 > localhost ~ # time rm /windows.qcow2 > > real 0m0.537s > user 0m0.000s > sys 0m0.456s > > But when that file is managed with ccreg40 plugin on same partition: > localhost ~ # ls -l /w* > -r--r--r-- 1 root root 2600005632 Apr 23 10:29 /w.qcow2 > localhost ~ # time rm /w.qcow2 > > real 1m1.523s > user 0m0.000s > sys 0m17.685s > > Data of a large ccreg40 file is scattered on many-many formatted nodes, so in order to delete such file we need to scan the tree and perform expensive surgery. While a reg40 file is just one extent pointer in a formatted node :) Edward. > iotop: 2044 be/4 root 16.23 M/s 16.25 M/s ?unavailable? rm /w.qcow2 > > If I can give any more data feel free to ask > > Have a nice day > > Dushan > > PS. > localhost ~ # uname -a > Linux localhost 2.6.31-hh #1 SMP Sat Feb 6 17:58:52 CET 2010 x86_64 > Intel(R) Core(TM)2 CPU 6400 @ 2.13GHz GenuineIntel GNU/Linux > > /dev/md2 / reiser4 noatime 0 0 > > Partition on Raid1 created with plain mkfs.reiser4 -o create=ccreg40 > -- > To unsubscribe from this list: send the line "unsubscribe reiserfs-devel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- To unsubscribe from this list: send the line "unsubscribe reiserfs-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
