Messages in this thread | | | From | Dongsheng Song <> | Date | Sun, 5 Feb 2012 12:20:51 +0800 | Subject | High 'Creating block layer request' or '[sleep_on_page] ' latency |
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Hi all,
I have observed many high 'Creating block layer request' or '[sleep_on_page] ' latency on Linux 3.2.4 and btrfs.
Cause Maximum Percentage synchronous write 14590.0 msec 5.9 % [btrfs_pin_log_trans] 12743.8 msec 7.8 % [lock_rename] 2624.6 msec 1.1 % Creating a file 1835.7 msec 3.2 % Creating block layer request 1835.2 msec 53.8 % Reading directory content 1674.0 msec 4.8 % [sleep_on_page] 1661.9 msec 21.0 % Reading from file 1626.9 msec 2.2 % Opening file 118.7 msec 0.2 %
Cause Maximum Percentage Creating block layer request 3716.4 msec 55.1 % [sleep_on_page] 606.5 msec 27.7 % Reading from file 571.9 msec 4.4 % Page fault 550.8 msec 6.8 % Pagecache sync readahead 108.3 msec 0.2 % synchronous write 103.0 msec 0.8 % Creating a file 88.3 msec 3.1 % [btrfs_tree_lock] 58.2 msec 0.1 % [btrfs_pin_log_trans] 33.8 msec 0.1 %
Is there something wrong ?
Regards, Dongsheng
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