[candl]

Is OpenBSD still largely single-threaded or have there been SMP improvements in the network stack over the years? The feature set OpenBSD has is impressive, but is there a large gap in networking perf compared to Linux/FreeBSD?

[eu]

From my $work computer:

    $ uname -a
    OpenBSD XXXXX 6.9 GENERIC.MP#3 amd64


    $top
    load averages:  0.83,  0.62,  0.44                                                                                                                                                            
    94 processes: 93 idle, 1 on processor                                                                                                                                                                       
    CPU00 states:  0.5% user,  0.0% nice,  0.2% sys,  0.3% spin,  0.6% intr, 98.4% idle
    CPU02 states:  6.5% user,  0.0% nice,  1.9% sys,  0.4% spin,  0.0% intr, 91.1% idle
    CPU04 states:  4.9% user,  0.0% nice,  1.6% sys,  0.3% spin,  0.0% intr, 93.1% idle
    CPU06 states:  4.0% user,  0.0% nice,  1.1% sys,  0.3% spin,  0.0% intr, 94.6% idle
    CPU08 states:  1.4% user,  0.0% nice,  0.6% sys,  0.2% spin,  0.0% intr, 97.8% idle
    CPU10 states:  1.4% user,  0.0% nice,  0.5% sys,  0.2% spin,  0.0% intr, 98.0% idle
    CPU12 states:  0.6% user,  0.0% nice,  0.3% sys,  0.1% spin,  0.0% intr, 99.0% idle
    CPU14 states:  0.7% user,  0.0% nice,  0.3% sys,  0.1% spin,  0.0% intr, 98.8% idle
    Memory: Real: 3292M/5988M act/tot Free: 9109M Cache: 1692M Swap: 0K/15G

[tadbit]

The person you're responding to was asking about network performance. I imagine specifically regarding pf (packet filter, the firewall component).

To the grandparent: PF is still single threaded. If you had performance issues with that before you may still have them, but CPU improvements over time may have negated that impact. It's worth trying it out again.