https://bugzilla.novell.com/show_bug.cgi?id=879071
https://bugzilla.novell.com/show_bug.cgi?id=879071#c13
--- Comment #13 from Michal Hocko 2014-06-02 16:11:17 CEST ---
One more thing. Although there might be some throttling on the writer side I
guess we are not doing it aggressively enough.
Here is the nr_dirtied vs nr_written comparison (nr_dirtied and nr_written are
per delay. diff = nr_dirtied - nr_written and total_diff is cumulative diff)
delay nr_dirtied nr_written diff total_diff
1.01195 34697 7000 27697 27701
1.00892 2936 10145 -7209 20492
1.01036 13107 10057 3050 23542
1.00863 14373 9495 4878 28420
1.00877 6894 10284 -3390 25030
1.31147 11541 13539 -1998 23032
1.00941 14969 9916 5053 28085
1.0086 4763 10430 -5667 22418
1.01123 15491 10169 5322 27740
1.00951 11298 10215 1083 28823
1.00873 3703 10168 -6465 22358
1.91098 12459 19335 -6876 15482
1.00859 19852 10229 9623 25105
2.10967 18650 21341 -2691 22414
1.00987 7760 10243 -2483 19931
we can clearly see that dirtier is ~24k pages ahead of writeback on average
which is ~90M so around 2s worth of writeback.
Btw. I do not see dirty throttling checking global_dirtyable_memory if
dirty_bytes is used. Is this OK?
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