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Re: stalled 'sync' on ext3+quota over drbd



More representative statistics for my "quota on ext3" trouble:

after moving about 10,000 files and setting quota for a million
groupids, and then several hours of inactivity(!) I zeroed profile
counters (readprofile -r), ran `time sync' and then `readprofile'.  Here
are the results.  Yes, that's true, it took 3 (three) hours for `sync'
to complete!

root nfsa2:/root# time sync
real    179m43.273s
user    0m0.000s
sys     177m51.640s
 
root nfsa2:~# readprofile -m /isolinux/System.map |sort -n|tail -20
    84 system_call                                1.5000
    96 .text.lock.ioctl                           2.6667
   100 .text.lock.namei                           0.0845
   112 tg3_poll                                   0.3684
   116 csum_partial_copy_generic                  0.4603
   123 serial_out                                 1.9219
   136 scsi_dispatch_cmd                          0.2024
   155 megaraid_isr_memmapped                     1.6146
   377 serial_in                                  7.8542
   436 .text.lock.module                          1.6769
  1209 do_softirq                                 5.3973
  1705 .text.lock.inode                           2.5601
  2199 .text.lock.exit                            7.5051
 18622 .text.lock.tty_io                         47.3842
 70802 .text.lock.buffer                        111.6751
139032 .text.lock.read_write                    1198.5517
501133 .text.lock.sched                         1332.8005
513897 default_idle                             6423.7125
1065574 vfs_quota_sync                           2663.9350
2318782 total                                      1.2959

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