On Mon, 2009-12-21 at 00:39 -0800, Gordon Messmer wrote:
On 11/24/2009 04:21 AM, John Austin wrote:
>
> Just tested my machine with UDP and TCP
> This was using md5sum for about 10GB over the NFS mount
>
> 1. The default for F12/Centos5.4 appears to be TCP - which freezes
> 2. Forcing UDP gives NO errors for 10GB transfer
> 3. Forcing TCP gives a freeze
>
I know this is an old thread, but I thought I'd toss in that you will
see symptoms very much like this if only one of your machines (probably
the NFS server) is configured to use jumbo frames. You should check the
MTU on the server and client.
Thanks for the idea
I have checked the host and the server, both are set to MTU of 1500
I then checked the switch (Netgear GS108T) this had jumbo frames enabled
Disabled jumbo frames - no change
Updated switch firmware - still no change
Problem still present with all F12 kernel versions (sky2 drivers) to
date
I have taken sky2 driver from latest stable kernel and tried to compile
under F12 but failed!
As I have a work around with 2nd NIC I have been lazy !!
Next move probably a custom kernel
John