Re: Getting Jumbo Frames to work on a p630

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Date:         Thu, 3 Jul 2003 12:00:20 -0400
To: aix-l@Princeton.EDU

James-

Did you also increase the MTU size from 1500 to 9000 for your Gbit adapter
interface?
you will have to bring the interface down to change the max MTU size and
then bring the interface back up.

"netstat -ni" will verify the max mtu size in use for each interface.

also- I recommend using 'nmon' to monitor the network performance. you
will see total MB/sec thru each
adapter and MTU size in use.

-pablo

-----Original Message-----
From: Victor M. Riefkohl [mailto:vitinr@BELLSOUTH.NET]
Sent: Thursday, July 03, 2003 11:31 AM
To: aix-l@Princeton.EDU
Subject: Re: Getting Jumbo Frames to work on a p630

James,

Check also the following:

tcp_sendspace mine are setup to 131072
tcp_recvspace also setup to 131072
rfc1323 my server setup to 1

In my case all this preparation did not work because after asking the
network group about the switch it end up they had another piece of equipment
in between that would not support Jumbo frames.

Hope it works for you. Good Luck.

Victor M. Riefkohl
Senior AIX System Admin - Consultant
IBM Global Services
-------Original Message-------

From: IBM AIX Discussion List <mailto:aix-l@Princeton.EDU>
Date: Thursday, July 03, 2003 11:14:30 AM
To: aix-l@Princeton.EDU <mailto:aix-l@Princeton.EDU>
Subject: Getting Jumbo Frames to work on a p630

What else needs to be done in order to get Jumbo Frames working on a p630.
I'm using a gigabit ethernet adapter of course. I've gone through the
screens to enable Jumbo Frames on the adapter, but a ping with larger than
1500 byte size just hangs. The Cisco switch that I am using has jumbo
frames enabled on the ports. Is there some other setting that needs to
changed other than the obvious ' chdev -l ent4 -a Jumbo_Frames=yes'?

I have a few linux client machines that happily ping large frames between
themselves, its this p630 that I am having difficulty with.

Thanks,

James

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• Previous message: Stephen Spalding: "Re: Restricting root"
• Maybe in reply to: James Thompson: "Getting Jumbo Frames to work on a p630"
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