[Samba] 10GE performance issues

[Gary Dale]

On 03/02/16 03:27 PM, Martin Markert wrote:
> Hi,
> we have network performance issues with Samba (Version 4.2.7-SerNet-RedHat-19.el6) on one of our servers. The maximum throughput from client to server is 110 MB/s (read/write) under Windows 7 x64 (single 10GE NIC). When using NFS on a different Linux workstation we're getting much higher rates, around 500-700 MB/s. I still can't find the problem.
>
> Setup server:
> CentOS 6.6
> Samba 4.7.2
> Mellanox 10GE NIC with LACP bonding
> local attached storage: XFS, 1,5 GB/s read/write
>
> [global]
>
>       workgroup = ARRI
>       server string = Samba Server Version %v
>       netbios name = BARBARELLA
>
>       log file = /var/log/samba/%m_%a_%R.log
>       max log size = 50
>       log level = 1
>
>      security = ads
>      realm = ARRI.DE
>      encrypt passwords = Yes
>
>      winbind enum users = Yes
>      winbind enum groups = Yes
>      winbind use default domain = Yes
>      winbind nested groups = Yes
>      winbind separator = +
>      winbind offline logon = false
>
>      idmap config * : backend = tdb
>      idmap config * : range = 600-799
>      idmap config ARRI:backend = ad
>      idmap config ARRI:range = 800-19999
>      idmap config ARRI:schema_mode = rfc2307
>
>       allow trusted domains = Yes
>       server signing = mandatory
>       client signing = mandatory
>       client use spnego = Yes
>       ntlm auth = Yes
>       lanman auth = No
>
>       preferred master = no
>
>       printcap name = /etc/printcap
>       load printers = no
>
>
> Do you have any suggestions?
>
> Kind regards,
> Martin
> --
> Martin Markert
> Westendstr. 89
> 80339 München
>
>
I could hazard a guess that NFS is simply faster than CIFS. Still 
getting only 10% of the raw disk capability seems pretty bad. Would I be 
right in assuming the two different workstations are similar in terms of 
hardware?

Also, have you considered the possibility that it might be a Windows 7 
configuration problem?