Slow read performance with SAMBA

Question

I'm experiencing slow read on my samba shares. Slow speed mean around 4MB/s on windows (1G wired) and about 25MB/s on OSX (wifi). Write speeds are around 112MB/s which saturate my 1G nic. OSX (wifi) to Windows (1G) is about 50-60MB/s.

The NAS i'm building is a 16G ram, XEON CPU, have 2 SSD in mirror (mdadm) and 2 WD red 4TB in ZFS mirror. Currently running ubuntu 16.04 and samba 4.3.11.

When i do a local copy from and to SSD i'm getting those results which look fine to me. x@nas:/vms$ sudo dd if=./xxx.mp4 of=/sol/movies/testoutput bs=100k count=1k 1024+0 records in 1024+0 records out 104857600 bytes (105 MB, 100 MiB) copied, 0.860855 s, 122 MB/s x@nas:/vms$ sudo dd if=/sol/movies/xxx.mp4 of=/vms/outputtest bs=100k count=1k 1024+0 records in 1024+0 records out 104857600 bytes (105 MB, 100 MiB) copied, 0.545534 s, 192 MB/s

Samba config is as follow (no noticeable changes except when i use sendfile, CPU usage skyrocket). socket options = IPTOS_LOWDELAY TCP_NODELAY SO_RCVBUF=65536 SO_SNDBUF=65536 ;use sendfile = yes ;write cache size = 2097152 min receivefile size = 16384 getwd cache = true write raw = yes read raw = yes

At this point i'm running out of ideas so i'm open to suggestions.

Thank you

Sol

Solution

Check https://www.samba.org/samba/docs/man/Samba-HOWTO-Collection/speed.html

We got some improvment using

socket options = TCP_NODELAY

Comments

[soleilblanc]

Hello Andres, thank you for your answer but i'm already using that socket options. I'll try removing the other options just to be sure.