Well, I've been using reiser4 for over 3 months now and using it as my / partition for about a month.

here're some interesting findings.

1. It IS faster than every file system out there, including reiserfs v3.6, no benchmarks but the system starts faster, games load faster, copying files is faster, etc.

2. It handles power going out/computer freezes pretty well (better than reiserfs/ext*).

3. old snapshot in speedy-sources worked fine but mysql database went corrupt randomly under heavy usage and bittorrent/amule had corrupt downloads.

4. new snapshot in love-sources-2.6.7_rc2-r2 locks the computer "after" heavy load (keyword after, not during), for example I can play ut2004 fine but 5 minutes after I finish playing it locks up the computer, although I can usually sync, umount and reboot cleanly with alt+sysrq.

5. I can play enemy-territory just fine, and I can emerge (compile) most stuff just fine, but for example the system locks up "after" emerging php/coreutils.

Other known bugs:

1. glibc/apache have permission problems because of the metas/ feature of reiser4, I've made a fix for that to disable metas/ by default and I'm testing it before i release it to the public.

2. apache randomly goes zombie and makes the "system" use 99% CPU (not apache itself).

Overall reiser4 is definitely a good test-filesystem, but it still needs to be more mature.

I recommend everyone to try it, It is NOT the most stable filesystem out there, but hey I can show you ext2, ext3, reiserfs, xfs horror stories so nothing is stable enough.

peace