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Date:      Tue, 30 Dec 2008 23:18:28 +0100
From:      Bernard Dugas <bernard@dugas-family.org>
To:        Matthew Seaman <m.seaman@infracaninophile.co.uk>
Cc:        freebsd-questions@freebsd.org, vince@unsane.co.uk
Subject:   Re: Optimising NFS for system files
Message-ID:  <495A9E34.6080009@dugas-family.org>
In-Reply-To: <495A9432.5070401@infracaninophile.co.uk>
References:  <20081216094719.EDCEE1065675@hub.freebsd.org>	<495930E4.1030501@dugas-family.org>	<20081229230115.F68805@wojtek.tensor.gdynia.pl> <495A8D31.8060406@dugas-family.org> <495A9432.5070401@infracaninophile.co.uk>

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Matthew Seaman wrote:
> It's 'mtu NNNN' not '-mtu NNNN'

I'm confused, thanks so much !

There was no option without - in my old unix time ;-)

Thanks to you, it seems that my max mtu is 9216 on em :

client9# ifconfig em1 mtu 9216
client9# ifconfig em1 mtu 9217
ifconfig: ioctl (set mtu): Invalid argument

Max mtu is changing on re :
nfsserver# ifconfig re0 mtu 1504
nfsserver# ifconfig re0 mtu 1505
ifconfig: ioctl (set mtu): Invalid argument

But another re accept 7422 :
client6# ifconfig re0 mtu 7422
client6# ifconfig re0 mtu 7423
ifconfig: ioctl (set mtu): Invalid argument

It seems that only testing can give the limit, this is not documented.

Best regards,
-- 
Bernard DUGAS Mobile +33 615 333 770



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