https://bugzilla.novell.com/show_bug.cgi?id=879071
https://bugzilla.novell.com/show_bug.cgi?id=879071#c6
--- Comment #6 from Michal Hocko 2014-05-22 16:45:18 CEST ---
Anyway, has the systemtap script pointed to something? Maybe we are pointlessly
congestion waiting...
Direct reclaim is quite efficient efficient (reclaimed/scanned):
[...]
1.00877 97.92
1.31147 92.40
1.00941 19.13
1.0086 100.00
1.01123 39.21
1.00951 86.23
1.00873 27.84
1.91098 57.99
1.00859 41.91
2.10967 62.97
1.00987 54.30
Interestingly the low effectiveness doesn't lead to bugger stalls. So it is
possible that the reclaimer gets into congestion_wait at the times when we see
bigger stalls.
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