[mythtv-users] Re: Samba 3 better than NFS 3 for recording
goliver at cistera.com
Thu Dec 29 00:32:10 EST 2005
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):
> 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
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