[Samba] Samba 4 is half as fast as Samba 3?!

[steve]

On Sat, 2014-04-19 at 10:48 +0200, Oliver Lehmann wrote:
> Hi,
> 
> 
> Stuart Naylor <stuartiannaylor at thursbygarden.org> wrote:
> 
> > I read the answer with interest.
> >
> > I have to ask, as I will take the reply as proof. Surely SMB2 isn't  
> > half as fast as standard CIFs?
> >
> > http://www.snia.org/sites/default/education/tutorials/2008/fall/networking/JimPinkerton-SMB2_Big_Improvements_Remote_FS_Protocol-v3.pdf
> >
> > Something is seriously wrong with the implementation if it is?!
> 
> With SMB2 I reach arround 85MB/sec
> With SMB3 I had 45MB/sec
> With NT1 I have 110MB/sec
> 

Hi
If I do:
mount -t cifs //server/share -o whatever
which do I get? Can only windows have smb2 and smb3? Does it depend upon
what is in smb.conf? Can 'whatever' specify it?
Cheers,
Steve