Re: Jumbo Frames

[Eric Schadow]

Karl

Check if jumbo frames are enabled on the switch the mainframe is plugged
into.

I think cisco switches need to be reloaded after changing the system MTU
size to jumbo frames.

For networking questions I tend to go right to a packet capture of some
sort as the packets never lie  - well almost never...

Eric

-----Original Message-----
From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On
Behalf Of Karl Kingston
Sent: Wednesday, November 17, 2010 12:30 PM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: Jumbo Frames

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Forgot to mention:  z/VM 5.4,   SLES10SP2 is the linux flavor




From:   Karl Kingston <karlkings...@ongov.net>
To:     IBMVM@LISTSERV.UARK.EDU
Date:   11/17/2010 12:26 PM
Subject:        Jumbo Frames
Sent by:        The IBM z/VM Operating System <IBMVM@LISTSERV.UARK.EDU>



hi Folks.. 

We have a z10BC and I'm trying to get Jumbo Frames to work. 

I set the MTU in Linux to 8992.   BUT when I transfer, I'm only seeing 
20MB/s? 

Even if it's between 2 servers on the same box and subnet? 

Did I misconfigure something?   


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<font size=2 face="sans-serif">Forgot to mention: &nbsp;z/VM 5.4, &nbsp;
SLES10SP2 is the linux flavor</font>
<br>
<br>
<br>
<br>
<br><font size=1 color=#5f5f5f face="sans-serif">From: &nbsp; &nbsp;
&nbsp;
&nbsp;</font><font size=1 face="sans-serif">Karl Kingston
&lt;karlkings...@ongov.net&gt;</font>
<br><font size=1 color=#5f5f5f face="sans-serif">To: &nbsp; &nbsp;
&nbsp;
&nbsp;</font><font size=1
face="sans-serif">IBMVM@LISTSERV.UARK.EDU</font>
<br><font size=1 color=#5f5f5f face="sans-serif">Date: &nbsp; &nbsp;
&nbsp;
&nbsp;</font><font size=1 face="sans-serif">11/17/2010 12:26 PM</font>
<br><font size=1 color=#5f5f5f face="sans-serif">Subject: &nbsp; &nbsp;
&nbsp; &nbsp;</font><font size=1 face="sans-serif">Jumbo Frames</font>
<br><font size=1 color=#5f5f5f face="sans-serif">Sent by: &nbsp; &nbsp;
&nbsp; &nbsp;</font><font size=1 face="sans-serif">The IBM z/VM
Operating System &lt;IBMVM@LISTSERV.UARK.EDU&gt;</font>
<br>
<hr noshade>
<br>
<br>
<br><font size=2 face="sans-serif">hi Folks..</font><font size=3> <br>
</font><font size=2 face="sans-serif"><br>
We have a z10BC and I'm trying to get Jumbo Frames to work.</font><font
size=3>
<br>
</font><font size=2 face="sans-serif"><br>
I set the MTU in Linux to 8992. &nbsp; BUT when I transfer, I'm only
seeing
20MB/s?</font><font size=3> <br>
</font><font size=2 face="sans-serif"><br>
Even if it's between 2 servers on the same box and subnet?</font><font
size=3>
<br>
</font><font size=2 face="sans-serif"><br>
Did I misconfigure something? &nbsp;</font><font size=3> <br>
</font>
<br>
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