From: Larry Finger <Larry.Finger@lwfinger.net>
To: David Miller <davem@davemloft.net>
Cc: castet.matthieu@free.fr, netdev@vger.kernel.org
Subject: Re: softmac mtu
Date: Sat, 23 Sep 2006 16:59:48 -0500 [thread overview]
Message-ID: <4515AE54.4040403@lwfinger.net> (raw)
In-Reply-To: <20060923.144757.78710420.davem@davemloft.net>
David Miller wrote:
> From: Larry Finger <Larry.Finger@lwfinger.net>
> 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.
Larry
next prev parent reply other threads:[~2006-09-23 21:59 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-23 17:50 softmac mtu Matthieu CASTET
2006-09-23 21:40 ` Larry Finger
2006-09-23 21:47 ` David Miller
2006-09-23 21:59 ` Larry Finger [this message]
[not found] ` <39e6f6c70609231504qd442c59hebf152df00a7af0c@mail.gmail.com>
2006-09-23 22:08 ` Arnaldo Carvalho de Melo
2006-09-23 22:23 ` David Miller
2006-09-25 19:17 ` Matthieu CASTET
2006-09-25 20:01 ` John W. Linville
2006-09-27 12:39 ` Jiri Benc
2006-09-27 13:57 ` castet.matthieu
2006-09-27 13:55 ` Johannes Berg
2006-09-27 17:17 ` matthieu castet
2006-09-28 7:39 ` Johannes Berg
2006-09-28 17:58 ` matthieu castet
2006-09-28 15:35 ` Michael Buesch
2006-09-28 15:45 ` Jouni Malinen
2006-09-28 15:47 ` Johannes Berg
2006-09-28 16:13 ` Jouni Malinen
2006-09-28 17:02 ` Daniel Drake
-- strict thread matches above, loose matches on Subject: below --
2006-09-23 17:50 Matthieu CASTET
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