's bl.aagh

BSD, Ruby, Rust, Rambling

Excessive Swapping with FreeBSD NUMA

Poor VM behaviour with ZFS ARC and unbalanced NUMA domains


Early last year I finally diagnosed a long-standing issue with my FreeBSD machine, which always had gobs of memory for things but which frequently encountered swap pressure for no discenerable reason.

This is a slightly edited copy of an unpublushed report I wrote back then, prior to the hardware being retired. Maybe it’ll be useful to someone.

Continue Reading