[Samba] extremely low performance on Samba 4.2.14-Debian

[Rowland Penny]

On Wed, 16 Aug 2017 23:28:08 +0200
"L.P.H. van Belle via samba" <samba at lists.samba.org> wrote:

> I HATE these auto send keys.. Did i tell that already..  
> ( see below ) 
> > -----Oorspronkelijk bericht-----
> > Van: L.P.H. van Belle [mailto:belle at bazuin.nl] 
> > Verzonden: woensdag 16 augustus 2017 23:22
> > Aan: 'samba at lists.samba.org'
> > Onderwerp: RE: [Samba] extremely low performance on Samba 
> > 4.2.14-Debian
> > 
> > Hai Emmanuel, 
> > 
> > But ive re-read the complete thread.
> > Its strange that the old machine is so much faster.
> > In thinging a bit, and it can go two ways.. 
> > I'm trowing in things i get in my head based on experiance 
> > aka wild guesses, but review it i suggest.
> > 
> > Samba bug/problem in settings combinations ( or wait for 
> > multi threaded samba 4.7. and test that)
> > 
> > Hardware/linux (driver/setting) combination, i'll come to 
> > that later on.. 
> > 
> > For samba. 
> > Can try with the following to see if one of these is slowing 
> > things down. 
> > In thinking in (kernel higher = better cifs (smb protocol 
> > support), and maybe improvements in xfs support (i haven't 
> > checked that). 
> > And check with modinfo the nic driver. 
> > I want to know if it possible to see the (by samba) detected 
> > interface speed. ( and mtu/tcp size rwin ).
> > 
> > Smb.conf suggestions, and test order.
> > Change: 
> > server signing = auto
> > Test,
> > Then again add:
> > ntlm auth = no
> > Test,
> > And im questioning these 2. 
> > In global you set. 
> > restrict anonymous 2
> > 
> > In the share.
> > guest ok = no
> > 
> > The google translater makes crap off:  This parameter 
> > nullifies the benefits of setting restrict anonymous = 2  :-/ 
> > Are these to settings conflicting or not.. In not sure here.
> > 
> > From man smb.conf 
> >       guest ok (S)
> > 
> >            If this parameter is yes for a service, then no 
> > password is required to connect to the service. Privileges 
> > will be those of the guest account.
> >            This parameter nullifies the benefits of setting 
> > restrict anonymous = 2
> >            See the section below on security for more 
> > information about this option.
> >            Default: guest ok = no
> > 
> > 
> > About the hardware/linux. 
> > 
> > Did you install/setup the hardware, (not judging your 
> > knowlidge, my thoughts) When you installed it, did you check 
> > the pci-e bus and the irq relations in the bios.
> > It is possible, the 40G nic is shareing the bus with the raid 
> > 6 contoller. 
> > That can slow down things. 
> > Bios raid/hdds/mainboard up to date, so changelog review cant harm. 
> > Is the nic using firmware?
> > The output of : 
> ethtool -i 
> 
> So few thing, i can think of i would check. 
> Its a pain, special when its far, the samba options are thing you
> might be able to remotely check. Maybe it helps a bit. 
> 
> Greetz, 
> 
> Louis 
> 
> 
> 
> 
> 

I would suggest that the OP tries this smb.conf:

[global]
    netbios name = storiq-111
    server string = %h server (Samba, Debian)
    security = ADS
    workgroup = TEST
    realm = AD.TEST.COM

    winbind refresh tickets = yes
    winbind use default domain = yes
    winbind cache time = 7200
    winbind offline logon = yes

    idmap config *:backend = tdb
    idmap config *:range = 2000-9999
    idmap config TEST:backend = rid
    idmap config TEST:range = 10000-50000000

    template shell = /bin/bash
    template homedir = /mnt/raid/%u

    log file = /var/log/samba/smbd.log
    max log size = 50

    vfs objects = acl_xattr 
    map acl inherit = yes
    store dos attributes = yes

[test_tr]
    # Set ACLs from Windows
    comment = Utilisateurs de test_tr
    path = /mnt/raid/test_tr
    read only = no

It doesn't have any default settings or any settings that might slow
things down (I also do not understand the reason behind having smb.conf
in three sections.)

Rowland