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Bug #21846
closedDefault ms log level results in ~40% performance degradation on RBD 4K random read IO
Status:
Closed
Priority:
Urgent
Assignee:
-
Category:
Performance/Resource Usage
Target version:
-
% Done:
0%
Source:
Tags:
Backport:
Regression:
No
Severity:
3 - minor
Reviewed:
Affected Versions:
ceph-qa-suite:
Component(RADOS):
Pull request ID:
Crash signature (v1):
Crash signature (v2):
Description
Luminous is now 15% slower than Jewel and over 40% slower as compared to when the ms logs are disabled.
v10.2.10 defaults:
bw ( KiB/s): min=101152, max=115880, per=100.00%, avg=111149.07, stdev=3721.50, samples=30 iops : min=25288, max=28970, avg=27787.23, stdev=930.28, samples=30
v12.2.1 defaults:
bw ( KiB/s): min=81376, max=98360, per=100.00%, avg=92884.47, stdev=4851.53, samples=30 iops : min=20344, max=24590, avg=23221.10, stdev=1212.87, samples=30
v12.2.1 w/ "debug ms = 0":
bw ( KiB/s): min=154096, max=165448, per=100.00%, avg=160584.73, stdev=3897.58, samples=30 iops : min=38524, max=41362, avg=40146.10, stdev=974.31, samples=30
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