MTU change on bonded device

Kimitoshi Takahashi ktaka at clustcom.com
Tue Jul 22 03:13:58 EDT 2003


Hello,

I'm a newbie in the cluster field.
I wanted to use jumbo frame on channel bonded device.
Any number larger than 1500 seems to be rejected.

# ifconfig bond0 mtu 1501
SIOCSIFMTU: Invalid argument

# ifconfig bond0 mtu 8000
SIOCSIFMTU: Invalid argument

Does anyone know if the bonding driver support Jumbo Frame ?
Or, am I doing all wrong ?

I could change MTUs of enslaved devices,

# ifconfig  eth2 mtu  7000
# ifconfig  eth2
eth2      Link encap:Ethernet  HWaddr 00:02:B3:96:0A:16  
          inet addr:192.168.0.201  Bcast:192.168.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING SLAVE MULTICAST  MTU:7000  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:25 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100 
          RX bytes:0 (0.0 b)  TX bytes:4198 (4.0 Kb)
          Interrupt:16 Base address:0xd800 Memory:ff860000-ff880000 
 
I use 2.4.20 stock kernel, with channel bonding enabled.
The bonded devices are eth1(e1000) and eth2(e1000).
Here is the relevant part of the ifconfig output,

# ifconfig  -a
bond0     Link encap:Ethernet  HWaddr 00:02:B3:96:0A:16  
          inet addr:192.168.0.201  Bcast:192.168.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MASTER MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:47 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 b)  TX bytes:7305 (7.1 Kb)

eth1      Link encap:Ethernet  HWaddr 00:02:B3:96:0A:16  
          inet addr:192.168.0.201  Bcast:192.168.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:24 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100 
          RX bytes:0 (0.0 b)  TX bytes:3625 (3.5 Kb)
          Interrupt:22 Base address:0xd880 Memory:ff8c0000-ff8e0000 

eth2      Link encap:Ethernet  HWaddr 00:02:B3:96:0A:16  
          inet addr:192.168.0.201  Bcast:192.168.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:23 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100 
          RX bytes:0 (0.0 b)  TX bytes:3680 (3.5 Kb)
          Interrupt:16 Base address:0xd800 Memory:ff860000-ff880000 

Thanks in advance.

Kimitoshi Takahashi 
ktaka at clustcom.com

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