Jumbo frames on PE 1950

Narendra_K at Dell.com Narendra_K at Dell.com
Mon Sep 22 04:20:06 CDT 2008


Hello,

I tried setting jumbo frames on a PE1950 and PE2950, both having bcm5708
nics.. This is what I did,

Ifconfig eth0 mtu 9000 on both the systems - 
On the switch side ( PowerConnect 5324) I set the jumbo frame by
executing "port jumbo-frame". It needed a "reload" before the  setting
became effective. "show ports jumbo-frame" would tell you if it is
enabled or not, after the reload.

I did a large file transfer between these two machines and I could see
many frames with length 9014 bytes.

With regards,
Narendra K

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Today's Topics:

   1. Re: Jumbo frames on PE 1950 (Tom Pierce)
   2. Re: Jumbo frames on PE 1950 (Matt Lawrence)


----------------------------------------------------------------------

Message: 1
Date: Sat, 20 Sep 2008 15:27:14 -0400
From: "Tom Pierce" <thpierce at gmail.com>
Subject: Re: Jumbo frames on PE 1950
To: "Matt Lawrence" <matt.lawrence at tamu.edu>, Linux-PowerEdge at dell.com
Message-ID:
	<25e9e5ad0809201227h5f308d72k2751ef0392807d2 at mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"

Matt,
You need to have your ethernet network support 9000 MTU. Most are not
configured for it.
You have to configure the switch/router(s) to pass on 9000 mtu packets.

ifconfig eth0 will tell you if your machine ethernet card is capable of
setting a mtu of 9000. Usually when you set it it wither works or it
tells you that the driver does not support 9000 byte packets.



On Fri, Sep 19, 2008 at 6:36 PM, Matt Lawrence
<matt.lawrence at tamu.edu>wrote:

> I'm running CentOS 5.2 with a much more recent kernel on a bunch of PE

> 1950 systems.  I have set the maximum MTU on the switch to 9000 and 
> I'm trying to make jumbo frames work.  No luck so far, with any MTU 
> greater than 1500,  netperf just gets the error: netperf: 
> receive_response: no response received. errno 110 counter 0
>
> Any idea what I have missed?
>
> -- Matt
>
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--
-----------------------
Thanks

Tom
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Message: 2
Date: Sat, 20 Sep 2008 15:32:43 -0500
From: Matt Lawrence <matt.lawrence at tamu.edu>
Subject: Re: Jumbo frames on PE 1950
To: Linux-PowerEdge at dell.com
Message-ID: <48D55DEB.80000 at tamu.edu>
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Tom Pierce wrote:
> Matt,
> You need to have your ethernet network support 9000 MTU. Most are not 
> configured for it.
> You have to configure the switch/router(s) to pass on 9000 mtu
packets.

The switch is configured to handle a MTU of 9000
> ifconfig eth0 will tell you if your machine ethernet card is capable 
> of setting a mtu of 9000. Usually when you set it it wither works or 
> it tells you that the driver does not support 9000 byte packets.

That works just fine.  Also, the "card" is actually the onboard NICs in
the 1950.

Any idea about what I should try next?

-- Matt



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