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Bug #17297
openhigh cpu usage for ceph-fuse (>150%)
Status:
New
Priority:
Normal
Assignee:
-
Category:
Performance/Resource Usage
Target version:
-
% Done:
0%
Source:
other
Tags:
Backport:
Regression:
No
Severity:
3 - minor
Reviewed:
Affected Versions:
ceph-qa-suite:
Component(FS):
ceph-fuse
Labels (FS):
Pull request ID:
Crash signature (v1):
Crash signature (v2):
Description
Hi,
we noticed, that our CephFS deployment is very very slow. If we try to extract for instance kernel source under mounted cephfs with ceph-fuse, ceph-fuse process eats almost two cores and extraction takes ~5mins.
This is the output from sysdig, which shows that almost every fifth futex() is timed out. Any suggestion what should we look first to debug this slowness?
# sysdig 'proc.name=ceph-fuse and evt.latency > 10000000' -p '%evt.type --> %evt.latency.human)' futex --> 28ms) futex --> 5.00s) futex --> 14ms) futex --> 15ms) futex --> 11ms) futex --> 11ms) futex --> 5.00s) futex --> 11ms) futex --> 15ms) futex --> 14ms) futex --> 14ms) futex --> 16ms) futex --> 19ms) futex --> 5.00s)
Thank you.
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