On Tue, 20 Jan 2026 18:11:18 -0800, Jason Thorpe <thorpej%me.com@localhost> wrote: >> On Jan 20, 2026, at 5:04 PM, Dennis Clarke <dclarke%blastwave.org@localhost> wrote: >> >> On a dual CPU old Sun SPARCStation 20 it seems to be only using one CPU. ... > Use GENERIC.MP; looks like the standard GENERIC doesn’t have MULTIPROCESSOR (and other associated options for it) enabled. From Jan 8 21:53:30 JST, my SPARCstation 20 is working with 2 CPUs to build entire NetBSD 10.1, in 100% CPU usage. Screen shots: https://mstdn.nere9.help/@7n2jju/115930828328006686 https://imgs.nere9.help/media_attachments/files/115/930/828/057/954/074/small/1ac953ac93e734f1.png (It still keep on buiding about two weeks, but my SS20 hanged in last Sunday because of memory related error. I resumed on Monday after I have replaced a doubtful memory module.) If kernel has configured for second cpu like, options MULTIPROCESSOR # include multiprocessor support cpu* at mainbus0 # declare additional CPUs dmesg shows cpu1 and if you have more. [ 1.000000] mainbus0 (root): SUNW,SPARCstation-20: hostid 7271b491 [ 1.000000] cpu0 at mainbus0: mid 8: TI,TMS390Z55 @ 75 MHz, on-chip FPU [ 1.000000] cpu0: physical 20K instruction (64 b/l), 16K data (32 b/l), 1024 K external (32 b/l): cache enabled [ 1.000000] cpu1 at mainbus0: mid 10: TI,TMS390Z55 @ 75 MHz, on-chip FPU [ 1.000000] cpu1: physical 20K instruction (64 b/l), 16K data (32 b/l), 1024 K external (32 b/l): cache enabled Lecturer / Faculty of Software & Info. Sci., Iwate Prefectural Univ., Japan Nobuyoshi Sato, Ph.D / nobu-s%iwate-pu.ac.jp@localhost / +81-19-694-2612