nfsd CPU usage?

[Eggert, Lars]

Hi,

I'm seeing extremely high CPU usage withssh-st the new nfsd:

  PID USERNAME   PRI NICE   SIZE    RES STATE   C   TIME   WCPU COMMAND
 2280 root       102    0  9932K  1376K *nfs_c  0 320:11 100.00% nfsd{nfsd: service}
 2280 root       102    0  9932K  1376K CPU7    7 319:47 100.00% nfsd{nfsd: service}
 2280 root       102    0  9932K  1376K CPU5    5 318:25 100.00% nfsd{nfsd: service}
 2280 root       102    0  9932K  1376K CPU6    6 318:20 100.00% nfsd{nfsd: service}
 2280 root        52    0  9932K  1376K CPU0    0 317:32 100.00% nfsd{nfsd: service}
 2280 root       102    0  9932K  1376K *nfs_c  1 315:41 99.17% nfsd{nfsd: service}
 2280 root        52    0  9932K  1376K *nfs_c  4 320:22 98.78% nfsd{nfsd: master}
 2280 root       102    0  9932K  1376K *nfs_c  1 317:10 98.10% nfsd{nfsd: service}

And this is at a few hundred KB/s with only a few clients:

ifstat -i igb1 10
       igb1       
 KB/s in  KB/s out
  796.56    208.66
  431.19    232.36
  316.11    280.31
 1005.96    523.42
 1077.74    342.25
  340.63    217.73
 1067.96    330.56
  487.91    235.61

Any ideas?

FreeBSD stanley.muccbc.hq.netapp.com 9.2-PRERELEASE FreeBSD 9.2-PRERELEASE #7: Wed Sep  4 11:06:31 CEST 2013     root at stanley.muccbc.hq.netapp.com:/usr/obj/usr/src/sys/STANLEY  amd64

Thanks,
Lars
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