[Samba] Performance issues since upgrading to 3.X to 4.X

Andreas Schneider asn at samba.org
Thu Jul 23 08:19:12 UTC 2020

On Monday, 20 July 2020 15:02:30 CEST Dragoniade via samba wrote:
> The latest bloc of 'performance' setting were those:
> # Settings to enhance performance:
> strict locking = no
> read raw = yes
> write raw = yes
> oplocks = yes
> max xmit = 65535
> deadtime = 15
> getwd cache = yes
> socket options = TCP_NODELAY SO_SNDBUF=128480 SO_RCVBUF=128480
> max protocol = SMB2
> # End of performance section

Take a look at


for performance tuning and DO NOT set socket options! Especially the SO_(RCV|
SND)BUF options are doing the opposite.

'testparm -s' is your friend for a working smb.conf file!

Also you should provide a complete output of 'testparm -s' or we can't really 

If you have a modern Linux version configure the vfs_io_uring module -> 'man 

Andreas Schneider                      asn at samba.org
Samba Team                             www.samba.org
GPG-ID:     8DFF53E18F2ABC8D8F3C92237EE0FC4DCC014E3D

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