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How to enable jumbo frames

Posted on 2005-04-10
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Last Modified: 2010-12-30
I always thought it was just upping the MTU on the interface, but apparently that doesn't work?

osaka root # ifconfig eth1 mtu 9000
SIOCSIFMTU: Invalid argument

Card is a Netgear GA311 (uses Realtek 8169).. i'm using the NAPI Tx/Rx polling option on 2.6.11 kernel.
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Question by:Chireru
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by:MKrauss
ID: 13748243
thasts maybe a bug within the driver, there are a couple issues with 8169 on 2.6.11,
see: http://kerneltrap.org/mailarchive/1/search/author/Francois%20Romieu .
If you have a chance then try 2.6.12-rc2 .
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by:prof666
ID: 13751527
Asked the same question myself:

http://www.experts-exchange.com/Networking/Linux_Networking/Q_21178421.html

let me know if you get an answer (as I also need to get this sorted). Looks as if the current drivers won't allows MTU above 1500 (any value about 1500 returns an error). I'm currently on Kernel 2.6.8 (SuSE 9.2).
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by:Chireru
ID: 13751999
My thoughts are that two things could be wrong with my setup:
1) I'm running gentoo's sources (they differ from the vanilla)
2) I enabled the NAPI Tx/Rx polling option

So I've disabled the option, and grabbed the latest vanilla kernel to try with, but have had no time to try it.

By the looks of a few of the messages linked by MKrauss, there may be a problem with the driver, but there is no-one there specifically stating that.
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by:Chireru
ID: 13758334
After upgrading to the newest kernel, and disabling NAPI, I can raise the MTU to 7200

osaka root # ifconfig eth1 mtu 7200
osaka root # ifconfig eth1 mtu 7201
SIOCSIFMTU: Invalid argument
osaka root # ifconfig eth1
eth1      Link encap:Ethernet  HWaddr 00:0F:B5:44:46:71
          inet addr:10.10.222.2  Bcast:10.10.222.255  Mask:255.255.255.0
          inet6 addr: fe80::20f:b5ff:fe44:4671/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:7200  Metric:1
          RX packets:1674 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1861 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:223898 (218.6 Kb)  TX bytes:1193570 (1.1 Mb)
          Interrupt:5 Base address:0xe000


Not sure if I could do this with the old kernel or with the NAPI option though.  Anyone have a clue why it won't go higher?
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by:prof666
ID: 13762869
How to disable NAPI, so I can test it on my system to see if this is limited to the newer kernel?
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by:Chireru
ID: 13767935
>  How to disable NAPI, so I can test it on my system to see if this is limited to the newer kernel?

It's an option in the kernel, under the r8169 driver
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by:Chireru
ID: 13811996
So... no ideas on how I can get 9k jumbo frames working?
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by:DanJ
ID: 34450835
Netgear GA311 largest MTU is 7000
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