https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244665
Bug ID: 244665
Summary: Very slow NFS I/O during ZFS resilver - _sleep()
sleeps really long...
Product: Base System
Version: 11.3-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: p...@lysator.liu.se
I've been investigating an issue we're having that gives our users a really
lousy NFS experience during ZFS resilver on one of our servers.
In order to try to pinpoint exactly what's going on I've tried various things.
Lately I've been dtrace the call path for "mkdir()" and it seems that it is the
_sleep() kernel call that sometimes sleeps for _really_ long times like 1-20
seconds...
Sure, the kernel is busy doing the ZFS resilver and other stuff but this is
silly... Any ideas? Too low priority of the _sleep (prio=99?) compared to other
kernel threads so it never gets scheduled?
One example:
21 54842 nfsrvd_dorpc:entry Start
21 47273 nfsv4_lock:entry Start(lp->nfslock_lock=6,
iwantlock=0)
21 37590 nfsmsleep:entry Start(ffffffff81e9982c,
ffffffff81e998a0, 99)
21 54396 _sleep:entry Start(prio=99, timeo=0)
16 54397 _sleep:return 10942618 µs
16 37591 nfsmsleep:return 10942626 µs
16 37590 nfsmsleep:entry Start(ffffffff81e9982c,
ffffffff81e998a0, 99)
16 54396 _sleep:entry Start(prio=99, timeo=0)
7 54397 _sleep:return 344 µs
7 37591 nfsmsleep:return 352 µs
7 47274 nfsv4_lock:return 10942987 µs
7 13973 nfsrvd_statstart:entry Start
7 13974 nfsrvd_statstart:return 2 µs
7 44369 nfsrv_mallocmget_limit:entry Start
7 44370 nfsrv_mallocmget_limit:return 2 µs
7 13971 nfsrvd_statend:entry Start
7 13972 nfsrvd_statend:return 2 µs
7 13973 nfsrvd_statstart:entry Start
7 13974 nfsrvd_statstart:return 1 µs
7 51444 nfsrv_mtofh:entry Start
7 51445 nfsrv_mtofh:return 2 µs
7 47329 nfsd_fhtovp:entry Start
7 48059 __mtx_lock_flags:entry Start
7 48060 __mtx_lock_flags:return 2 µs
7 47330 nfsd_fhtovp:return 14 µs
7 13971 nfsrvd_statend:entry Start
7 13972 nfsrvd_statend:return 1 µs
7 13973 nfsrvd_statstart:entry Start
7 13974 nfsrvd_statstart:return 1 µs
7 43887 nfsrvd_getattr:entry Start
7 38608 nfsv4root_getreferral:entry Start
7 38609 nfsv4root_getreferral:return 2 µs
7 43888 nfsrvd_getattr:return 22 µs
7 13971 nfsrvd_statend:entry Start
7 13972 nfsrvd_statend:return 1 µs
7 54843 nfsrvd_dorpc:return 10943076 µs
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