最新CURRENTで試してみなよ
rpi2も25コケるけど

% uname -v ; 7z b
FreeBSD 11.1-RELEASE #0 r321309: Fri Jul 21 14:27:25 UTC 2017 root@releng2.nyi.freebsd.org:/usr/obj/arm.armv6/usr/src/sys/RPI2

7-Zip [32] 16.02 : Copyright (c) 1999-2016 Igor Pavlov : 2016-05-21
p7zip Version 16.02 (locale=ja_JP.UTF-8,Utf16=on,HugeFiles=on,32 bits,4 CPUs LE)

CPU Freq: 591 811 889 889 889 889 889 889

Dict Speed Usage R/U Rating | Speed Usage R/U Rating
22: 1099 295 362 1069 | 26574 373 608 2267
23: 1107 299 378 1129 | 25899 371 603 2241
24: 1093 299 394 1176 | 25316 372 598 2222