[mythtv-users] Re: Samba 3 better than NFS 3 for recording over
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
> > _______________________________________________
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> > mythtv-users at mythtv.org
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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.
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