On 9/23/06, Arnaldo Carvalho de Melo <[EMAIL PROTECTED]> wrote:
On 9/23/06, Larry Finger <[EMAIL PROTECTED]> wrote:
> David Miller wrote:
> > From: Larry Finger <[EMAIL PROTECTED]>
> > Date: Sat, 23 Sep 2006 16:40:15 -0500
> >
> >> The maximum value for MTU is set in include/linux/if_ether.h for all
> >> ethernet-type communications, not in softmac or ieee80211. I doubt
> >> that one could easily change the number. It may be that the 802.11
> >> standard allows bigger frames, but it looks to me as if Linux does
> >> not.
> >
> >
> > Not correct. Linux is perfectly fine with setting 9000 byte MTU on
> > ethernet devices that support it, and in fact just about every
> > gigabit ethernet driver supports it.
> >
> > That macro you see in if_ether.h is just the value of the base MTU
> > limit, so larger MTU settings are easily allowable on a per-device
> > basis.
>
> Where/how does the device allow it? When I tried 'ifconfig eth0 mtu 2000' on
my VIA Technologies,
> Inc. VT6102 [Rhine-II] wired controller, I got a 'SIOCSIFMTU: Invalid
argument' message, which is
> the same message I get on my BCM4306 wireless card.
David didn't said 1500 all the way to 9000, he said that some drivers
support 9000, some don't, lemme check for ya which one does...
drivers/net/8139cp.c: max is 4096
drivers/net/acenic.c: 9000
just do a:
vi $(find drivers/net | xargs grep -l change_mtu)
and check the rest :-)
- Arnaldo
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