Re: rpc.mountd at 99% cpu

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

Reuti,

/proc/fs/nfsd/ does exist.  I'll go back and have a look at your posts.

-Brian



Reuti wrote:

> Typo: the one I meant was /proc/fs/nfsd - is there anything in this
> directory?
>
> -- Reuti
>
> Zitat von 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
> >
> >
> >
> > -------------------------------------------------------
> > This SF.Net email is sponsored by:
> > Power Architecture Resource Center: Free content, downloads,
> discussions,
> > and more. http://solutions.newsforge.com/ibmarch.tmpl
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> > https://lists.sourceforge.net/lists/listinfo/nfs
> >
>

-- 
Brian Elliott Finley
Linux Strategist, CIS
Desk: 630.252.4742
Cell: 630.631.6621



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