On Sun, May 21, 2006 at 02:43:24PM -0500, Jay Cliburn wrote:
> I'm trying to set the MTU size on my Via Velocity 6122 Gbit adapter from
> the default of 1500 down to 1492, but I keep getting this error:
>
> [root@osprey ~]# ifconfig eth0 mtu 1492
> SIOCSIFMTU: Invalid argument
>
> Turns out that via-velocity.h defines the minimum MTU at 1500 bytes.
>
> #define VELOCITY_MIN_MTU (1514-14)
> #define VELOCITY_MAX_MTU (9000)
>
> And via-velocity.c enforces the limit.
>
> if ((new_mtu < VELOCITY_MIN_MTU) || new_mtu > (VELOCITY_MAX_MTU)) {
> VELOCITY_PRT(MSG_LEVEL_ERR, KERN_NOTICE "%s: Invalid MTU.\n",
> vptr->dev->name);
> return -EINVAL;
> }
>
> This is an Abit AV8 motherboard with an Athlon64 3000+ cpu running
> 2.6.16-1.2111_FC5 x86_64.
>
> Can someone explain why the driver might constrain the NIC to a minimum
> MTU size of 1500?
Asking the developers on netdev@xxxxxxxxxxxxxxx is going to get
you the answer faster than asking here.
Dave
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http://www.codemonkey.org.uk
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