Hello,
I was advised by someone on the fedora-devel-list to post my question
here.
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:
[EMAIL PROTECTED] ~]# 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
Fedora Core 5, kernel 2.6.16-1.2111_FC5 x86_64.
Can someone please explain why the driver might constrain the NIC to a
minimum MTU size of 1500?
Thanks,
Jay
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