jumbo frames issue (9000 bytes MTU)

Sturgis, Grant Grant.Sturgis at arraybiopharma.com
Thu Jul 28 09:33:10 CDT 2005

Perhaps you should try the mount options wsize and rsize=32768

-----Original Message-----
From: linux-poweredge-bounces at dell.com
[mailto:linux-poweredge-bounces at dell.com] On Behalf Of wolf2k5
Sent: Thursday, July 28, 2005 3:30 AM
To: Discussion of Red Hat Enterprise Linux 3 (Taroon);
Linux-PowerEdge at dell.com
Subject: jumbo frames issue (9000 bytes MTU)


I enabled jumbo frames (9000 bytes MTU) on two Dell PowerEdge 1850
servers running Red Hat Enterprise Linux 3 ES Update 5 x86_64 using the
following commands:

ifconfig eth1 mtu 9000
service network restart

After the MTU change, I was able to transfer (scp) very small files
between the servers, ping also worked fine, but when trying to transfer
bigger files, the copy process got stuck. Also, the NFS mounts didn't
work anymore.

I reverted the MTU change and all got back to work as before.

The switch is a Dell PowerConnect 5324 and it should support jumbo
frames just fine.

Do you have any idea about the cause of the issue?

Should I reboot the server instead of just restarting the network


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