Ryan Steffes wrote:
On 12/29/05, *Greg Oliver* <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
Jumbo frames are your friend
On Wed, 2005-12-28 at 21:29 -0800, Jonathan Tidmore wrote:
> On 12/28/05, Mike Frisch <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> 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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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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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
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