Jumbo Frames on MacBook

Soldato
Joined
30 Dec 2004
Posts
2,869
Location
Stoke-on-Trent
Trying to optimise my GbE network on my MB my changing the Jumbo Frames in Network Configuration.

However when I edit the ethernet -> advanced features any changes I do to the MTU size refuse to stick, i.e. I set it at :-

Config - Manual
Speed - 1000TBase
Duplex - Full Duples
MTU - 7000

but when i back out and apply them on my retuen it has changed to

Config - Manual
Speed - automaticall
Duplex - [greyed out]
MTU - [greyed out]

I have 7000 set as my jumbo frames on both my win7 machines on my network and that works fine; its just this bit I can't get to stick.

The differance is that if I don't use JF then my txfr speed is ~40MB/s where as using JF I can get ~85-90MB/s

Can anyone shed any light on why my settings are not sticking. (I have a HP 1400-8G Switch)
 
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