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

Ryan Steffes rbsteffes at gmail.com
Thu Dec 29 00:49:54 EST 2005


On 12/29/05, Greg Oliver <goliver at cistera.com> wrote:
>
> Jumbo frames are your friend
>
> On Wed, 2005-12-28 at 21:29 -0800, Jonathan Tidmore wrote:
> > 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):
> >
> > WARNINGS
> >        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 fragmentation.
> >
> > They go into greater detail about this issue.  For info use 'man 5
> > nfs'
> >
> >
> > -J
> > _______________________________________________
> > mythtv-users mailing list
> > mythtv-users at mythtv.org
> > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users



Hmm, I wonder if this may be related to why nfs apparently locks my machine
in heavy use.  It started when I switched to gigabit nics and I was blaming
the cards, until I realized I could do high data transfers with the computer
as long as I don't use nfs.

Ryan
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