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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