[mythtv-users] Re: Samba 3 better than NFS 3 for recording over Ethernet

Jonathan Tidmore jtidmore at gmail.com
Thu Dec 29 00:29:40 EST 2005

On 12/28/05, Mike Frisch <mfrisch at isurfer.ca> wrote:
> The "tcp" option may not be necessary but I haven't taken the time to
> benchmark between TCP and UDP.

For gigabit ethernet, the nfs people recommend TCP.

>From the man page for nfs (5):

       Using NFS over UDP on high-speed links such as Gigabit can cause
silent data corruption.

       The  problem  can  be  triggered at high loads, and is caused by
problems in IP fragment reassembly. NFS
       read and writes typically transmit UDP packets of 4 Kilobytes or
more, which have to be broken  up  into
       several  fragments  in  order  to  be sent over the Ethernet link,
which limits packets to 1500 bytes by
       default. This process happens at the IP network layer and is called

They go into greater detail about this issue.  For info use 'man 5 nfs'

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mythtv.org/pipermail/mythtv-users/attachments/20051228/f7a6b871/attachment.htm

More information about the mythtv-users mailing list