[kwlug-disc] NFS Setups (was Re: setting up a samba network with no windows systems?)

Lori Paniak ldpaniak at fourpisolutions.com
Sun Oct 18 21:15:35 EDT 2009



On Sun, 2009-10-18 at 20:23 -0400, Andrew Kohlsmith (Mailing List
Account) wrote:
> On October 18, 2009 07:51:16 pm john at netdirect.ca wrote:
> > With UDP your application has to make sure all is well. With TCP the
> >  operating system does so. Programmers would choose TCP and it's generic
> >  error checking/recovery for ease of use, or choose UDP so they can define
> >  an error checking/recovery method that works best for the application.
> 
> That is fine and all, but it doesn't answer the question.  :-)
> 
> Do the NFS server and client ensure reliable communication, or is it all "best 
> effort" when using UDP with NFS?
> 
> -A.


This note on NFS performance tuning is probably out of date with V4 on
the horizon, but it might just render the question of UDP vs TCP for NFS
moot:

http://nfs.sourceforge.net/nfs-howto/ar01s05.html

In short, they claim the difference in performance is only noticeable
with careful measurement. One important feature of TCP: flow control.
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