Subject: Re: NFS problem.
To: Matthias Scheler <>
From: Johnny Billquist <>
List: current-users
Date: 12/10/2005 00:56:03
Matthias Scheler wrote:
> On Sat, Dec 10, 2005 at 12:24:41AM +0100, Johnny Billquist wrote:
>>Wasn't there a problem in the past with large UDP packets and NFS?
> Yes, but it hasn't changed and never will. Large UDP packets are sent
> as IP fragments. If you lose one of the IP fragments the whole UDP
> packet is lost because there is no selective retransmit. When a machine
> e.g. loses 5% of incoming packets at least one of the IP fragments
> of a 32KB UDP packet will always get lost. Retries will not help because
> another single lost packet will prevent the reception of the UDP packet.

The problem is that some hardware cannot send that many packets in a 
burst like NFS does. So it will never succeed.

Ah, found it.
you can set those options in your config file to change the size of 
those packets.


Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email:           ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol