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Improving Samba's performance on OpenBSD

• 2021-11-23

  After upgrade to 7.0, performance has improved noticeably when using rsync, I haven't checked with samba yet but I expect to see similar results. I've updated the original article: Low throughput over LAN on Wi-Fi.

A few months ago, I wrote about the Low throughput over LAN on Wi-Fi. I increased net.inet.divert.sendspace after reading Network Speed and Performance Guide (OpenBSD) & How to Fix Slow Samba smbd on OpenBSD.

Those articles ask to change some other values too but as I don't really understand what these values mean, I made minimal changes. Transfer speeds were low only when sending the files so I just increased sendspace.

# /etc/sysctl.conf
# 2 ** 17 = 131072

net.inet.divert.sendspace=131072
net.inet6.divert.sendspace=131072

# /etc/samba/smb.conf

[global]
# put right after global
socket options = SO_SNDBUF=131072 SO_RCVBUF=65536

These changes fixed the issue.