Long rm times of ccreg40 R4 files

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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

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
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