High CPU time from nfsd threads in svc_poll, svc_getreq or svc_run
(Doc ID 2114369.1)
Last updated on MARCH 10, 2025
Applies to:
Solaris Operating System - Version 8 6/00 U1 to 10 1/13 U11 [Release 8.0 to 10.0]Information in this document applies to any platform.
Symptoms
An NFS server's nfsd daemon is consuming very large amounts of CPU - at times when the NFS client workload is not abnormally high.
An mpstat indicates very high contention (smtx), and lockstat reveals most of the CPU time is in svc_poll(), svc_xprt_qget() or svc_squeuereq() calls - for example:
Adaptive mutex spin: 234513 events in 5.140 seconds (45626 events/sec)
Count indv cuml rcnt nsec Lock Caller ----- ---- ----- ---- ------- ------------- ------------------------------------ 71114 30% 30% 0.00 4162228 0x3036584cae0 cv_timedwait_sig_hires+0x1c0 58276 25% 55% 0.00 1159092 0x3036584cae0 svc_poll+0x1b8 55601 24% 79% 0.00 1033661 0x3036584cae0 svc_poll+0xd8 31141 13% 92% 0.00 9251 0x6005073ef00 clock_tick_process+0xc8 5805 2% 95% 0.00 189237 0x3036584cb48 svc_xprt_qget+0xc 2486 1% 96% 0.00 1613775 0x3036584cae0 svc_queuereq+0x20 2032 1% 97% 0.00 6110 0x30007409940 clock_tick_process+0x2c 1144 0% 97% 0.00 502410 0x3036584cae0 svc_poll+0x158 995 0% 97% 0.00 536363 vx_worklist_lk vx_worklist_process+0x98 390 0% 98% 0.00 469994 0x3036584cae0 svc_poll+0x9c ...
Cause
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In this Document
| Symptoms |
| Cause |
| Solution |
| References |