Re: rpc.mountd at 99% cpu

[Brian Elliott Finley <finley@anl.gov>]

Reuti,

Thanks for your reply, but I'm afraid /proc/nfs/nfsd is *not* currently
mounted.

Cheers, -Brian


Reuti wrote:

> Brian,
>
> is there a file system mounted in /proc/nfs/nfsd - then nfsd is working
> in a new
> mode? You can try *not* to mount it in the start/stop-script of the NFS
> server.
> This way you will force nsfd to operate in a legacy mode. If you
> followed my
> posts last week, this solved a problem with stale file handles for me.
>
> Cheers - Reuti
>
>
> Zitat von Brian Elliott Finley <finley@anl.gov>:
>
> > I've got an nfs server (quad cpu amd64, 36G mem, failover fiberchannel)
> > running ubuntu, and I'm getting the following behavior that I haven't
> > been able to track down yet:
> >
> >    * rpc.mountd spikes to 99% cpu usage when a client machine mounts,
> >      causing a temporary disruption in service to all client systems
> >
> > Google, NFS Howtos, NFS Perf Tuning docs, IRC (can't find an NFS
> > specific IRC channel), local sysadmins all turn up nothing so far.  Here
> > are potentially relavant data:
> >
> >    * exportfs -v -o rw,secure,sync,no_root_squash
> >      10.10.0.0/255.255.0.0:/export/home
> >    * nfs server has all clients info in /etc/hosts
> >    * /etc/hosts is first in nsswitch.conf
> >    * kernel is ubuntu's: linux-image-2.6.10-5-amd64-k8-smp
> >    * nfs performance is fine once a filesystem is mounted
> >    * unless, someone else is mounting a filesystem, in which case
> >      already mounted filesystems
> >    * only 8 clients
> >    * home directories mounted by autofs on clients as
> >      server:/export/home/bob /home/bob
> >    * 32 nfsd threads
> >    * % netstat -in
> >      Kernel Interface table
> >      Iface   MTU Met   RX-OK RX-ERR RX-DRP RX-OVR   TX-OK TX-ERR TX-DRP
> >      TX-OVR Flg
> >      eth0   1500 0  247854230      0      0      0324570001      0
> >      0      0 BMRU
> >      eth1   1500 0  1022171197      0      0      0258643880
> >      0      0      0 BMR U
> >      lo    16436 0    419024      0      0      0  419024      0
> >      0      0 LRU
> >    * % cat /proc/net/rpc/nfsd | grep ^th
> >      th 32 8229 13759.142 6537.314 1919.479 4.212 129.977 52.636 11.780
> >      10.231 0.000 101.321
> >    * caching bind9 installed on server, and it points to itself for
> >      first nameserver entry
> >
> > Any one know what's up here?  Or how I can tell what's making rpc.mountd
> > take so much time?
> >
> > --
> > Brian Elliott Finley
> > Linux Strategist, CIS
> > Desk: 630.252.4742
> > Cell: 630.631.6621
> >
> >
> >
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>
>
>
>
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-- 
Brian Elliott Finley
Linux Strategist, CIS
Desk: 630.252.4742
Cell: 630.631.6621



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