samba - Feb 2013 - smb2 vs. NT1

hi All,


We have a glusterfs cluster with 5 nodes on Ubuntu 12.04 amd64.
We use this smb.conf:

[global]
	socket options =  IPTOS_THROUGHPUT TCP_NODELAY IPTOS_LOWDELAY SO_SNDBUF=131072
SO_RCVBUF=131072
	read raw = yes
	server string = %h
	write raw = yes
	#oplocks = yes
	max xmit = 131072
	dead time = 15
	getwd cache = yes
	use sendfile=yes
	block size = 131072
	load printers = no
	aio read size = 16384
	aio write size = 16384
	aio write behind = /*.*/
	wins support = no
	local master = no
	wins server = 192.168.3.7
	veto files = /.AppleDouble/
	delete veto files = yes
	hide dot files = yes
	printing = BSD
	max protocol = SMB2
	min protocol = SMB2

[projects]
	path = /W/Projects
	browseable = yes
	public = yes
	guest ok = yes
	read only = no
	force user = user
	force group = user



The speed is fine with this configuration, around 100Mbyte/s. If I change
protocol to NT1, the speed
drops to around 50Mbyte/s.

This is from man page:

NT1: Current up to date version of the protocol. Used by Windows NT. Known as
CIFS.
SMB2: Re-implementation of the SMB protocol. Used by Windows Vista and newer.
The Samba
implementation of SMB2 is currently marked experimental!


Why is it still experimental? What does it mean exactly? Is there anything I
should avoid it, like
file corruption or so?
Why NT1 is _much_ slower then SMB2?




Thank you,
tamas

On Mon, Feb 25, 2013 at 09:38:51AM +0100, Papp Tamas
wrote:
> hi All,
> 
> 
> We have a glusterfs cluster with 5 nodes on Ubuntu 12.04 amd64.
> We use this smb.conf:
> 
> [global]
> 	socket options =  IPTOS_THROUGHPUT TCP_NODELAY IPTOS_LOWDELAY
SO_SNDBUF=131072 SO_RCVBUF=131072
Remove the above line. It's pure voodoo. Don't second
guess the kernel w.r.t. socket options.
> 	read raw = yes
> 	server string = %h
> 	write raw = yes
> 	#oplocks = yes
> 	max xmit = 131072
> 	dead time = 15
> 	getwd cache = yes
> 	use sendfile=yes
> 	block size = 131072
> 	load printers = no
> 	aio read size = 16384
> 	aio write size = 16384
> 	aio write behind = /*.*/
> 	wins support = no
> 	local master = no
> 	wins server = 192.168.3.7
> 	veto files = /.AppleDouble/
> 	delete veto files = yes
> 	hide dot files = yes
> 	printing = BSD
> 	max protocol = SMB2
> 	min protocol = SMB2
> 
> [projects]
> 	path = /W/Projects
> 	browseable = yes
> 	public = yes
> 	guest ok = yes
> 	read only = no
> 	force user = user
> 	force group = user
> 
> 
> 
> The speed is fine with this configuration, around 100Mbyte/s. If I
> change protocol to NT1, the speed drops to around 50Mbyte/s.
That will be due to the async requests that the Windows SMB2
redirector uses much more than the SMB1 redirector.
> This is from man page:
> 
> NT1: Current up to date version of the protocol. Used by Windows NT. Known
as CIFS.
> SMB2: Re-implementation of the SMB protocol. Used by Windows Vista
> and newer. The Samba implementation of SMB2 is currently marked
> experimental!
SMB2 in Samba is fully supported from Samba 3.6.0 onwards.
It was "experimental" (read, didn't really work :-) in
3.5.x and below.

Jeremy.