14.1-STABE - zfs-2.2.6 sluggish on arm64 and arc_prune at 99% during poudriere

Hello,

Since I upgrade my rockpro64 to

FreeBSD keystone.lab.bel 14.1-STABLE FreeBSD 14.1-STABLE #0 
stable/14-n268744-79c34d704f31: Sun Sep 29 13:38:10 CEST 2024 
root@keystone.lab.bel:/usr/obj/usr/src/arm64.aarch64/sys/GENERIC arm64

when I start

cpuset -c -l 4-5 poudriere bulk -j 14aarch64 -z pine64 -f 
/usr/local/poudriere/pine64-pkglst

everything is running at least 2 to 3 times slower than under

FreeBSD 14.1-STABLE #0 stable/14-n267830-339b47f01985

Some build repeatedly fail with eg :

pkg-static: Fail to chmod /afm/public/nanumtype1/nanummjbd7.afm:Bad file descriptor

previously this fail was rather uncommon.

Moreover at soon as poudriere bulk start top -SH show:

last pid: 79185;  load averages:  3.53,  3.72,  3.85 
                            up 5+01:17:19  17:14:19
502 threads:   13 running, 463 sleeping, 26 waiting
CPU:  0.1% user,  0.2% nice, 38.8% system,  0.1% interrupt, 60.9% idle
Mem: 77M Active, 422M Inact, 4112K Laundry, 1318M Wired, 1987M Free
ARC: 676M Total, 284M MFU, 66M MRU, 11M Anon, 14M Header, 301M Other
      69M Compressed, 294M Uncompressed, 4.25:1 Ratio
Swap: 8192M Total, 35M Used, 8157M Free

   PID USERNAME    PRI NICE   SIZE    RES STATE    C   TIME    WCPU COMMAND
     0 root         -8    -     0B  2432K CPU1     1  96.8H  99.61% 
kernel{arc_prune}
    11 root        187 ki31     0B    96K RUN      0  98.0H  98.76% idle{idle: cpu0}
    11 root        187 ki31     0B    96K RUN      1  94.6H  97.63% idle{idle: cpu1}
26388 root        135    4   110M    78M CPU5     5  82:53  94.30% bsdtar
    11 root        187 ki31     0B    96K RUN      3  91.9H  79.92% idle{idle: cpu3}
    11 root        187 ki31     0B    96K RUN      2  98.8H  61.87% idle{idle: cpu2}
    11 root        187 ki31     0B    96K RUN      5  26.5H  27.09% idle{idle: cpu5}
......

arc_prone running at 99% on one of the CPU all the time, note that 1987M Free.

Does anyone encounter this sort of problems?

Thanks for your time

Henri