[Gluster-devel] Possible Performance Tweak for unfsd Users

Shehjar Tikoo shehjart at gluster.com
Wed Jan 6 15:46:03 UTC 2010

Gordan Bobic wrote:
> I can't figure out why this might be the case, but it would appear
> that when unfsd is bound to a custom port and not registered with
> portmap, the performance is massively improved.
> I changed my init.d/unfsd script as follows, in the start option:
> - /usr/sbin/unfsd -i ${pidfile} + /usr/sbin/unfsd -e /etc/uexports
> -i ${pidfile} -m 12049 -n 12049 -p

How was your experience with LD_PRELOADed booster instead of going
through a FUSE mountpoint?

> cat /etc/uexports /home ,insecure)
> On the client side I am mounting with:
> server:/home  /home  nfs 
> defaults,nolock,hard,noatime,proto=udp,rsize=32768,wsize=32768,port=12049,mountport=12049
>  0 0

You're using UDP. Are you sure NFS client did not default to TCP
earlier when you were not specifying non-default ports?

> All of the horrible latency and laggyness is completely gone! Could
> it be that it is unfsd's interraction with rpc/portmap/mountd that
> is the cause of a lot of the performance issues?

unfsd only needs to register with portmap once when it starts so I
dont think that is the reason.

> I only did this to improve the performance of my non-glfs exports
> by running knfsd for those, and only running unfsd for the glfs
> exports, but this speed boost is quite a boon. :)
> Note: know for a fact that knfsd isn't exporting the glfs mounted
> /home because I'm not using the patched fuse kernel module that
> allows nfs exports, even if the fact that /home wasn't listed in
> /etc/exports wasn't enough (using /etc/uexports for unfsd, as per
> the startup option).
> Can anybody confirm similar behaviour on their setup?
> Gordan
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