[mythtv-users] Re: Samba 3 better than NFS 3 for recording over
Ethernet
Simon Lundell
simon.lundell at his.se
Thu Dec 29 04:17:16 EST 2005
Ryan Steffes wrote:
>
>
> On 12/29/05, *Greg Oliver* <goliver at cistera.com
> <mailto: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
> <mailto: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 <mailto: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
>
>------------------------------------------------------------------------
>
>_______________________________________________
>mythtv-users mailing list
>mythtv-users at mythtv.org
>http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>
>
I have had the same exact problem. The machine hardlocks, and a cold
boot is necissary. I eventually changed nics to a 100Mbit in the frontend.
//Simon
More information about the mythtv-users
mailing list