After updating the edge kernel to 6.17, and then to 6.18-rc, the performance of my ODroid-N2 dropped drastically.
Here are the performance test results of 7zip with different kernel versions for comparison
I compile the kernel myself using the armbian build system and install the resulting .deb.
'7z b'
7-Zip 23.01 (arm64) : Copyright (c) 1999-2023 Igor Pavlov : 2023-06-20
64-bit arm_v:8 locale=en_GB.UTF-8 Threads:6 OPEN_MAX:1024
Compiler: 13.2.0 GCC 13.2.0
Linux : 6.16.6-edge-meson64 : #1 SMP PREEMPT Tue Sep 9 17:02:41 UTC 2025 : aarch64
PageSize:4KB THP:always hwcap:8FF:CRC32:SHA1:SHA2:AES:ASIMD
LE
1T CPU Freq (MHz): 1901 1897 1904 1904 1904 1904 1903
3T CPU Freq (MHz): 298% 1894 298% 1892
RAM size: 3769 MB, # CPU hardware threads: 6
RAM usage: 1334 MB, # Benchmark threads: 6
Compressing | Decompressing
Dict Speed Usage R/U Rating | Speed Usage R/U Rating
KiB/s % MIPS MIPS | KiB/s % MIPS MIPS
22: 7244 525 1343 7048 | 136762 553 2109 11660
23: 6896 533 1317 7026 | 128222 535 2071 11092
24: 6626 539 1323 7124 | 114197 478 2096 10021
25: 6170 542 1301 7045 | 121553 536 2020 10818
---------------------------------- | ------------------------------
Avr: 6734 535 1321 7061 | 125184 526 2074 10898
Tot: 530 1698 8979
-------------------------------------------------------------------------------------------------
7-Zip 23.01 (arm64) : Copyright (c) 1999-2023 Igor Pavlov : 2023-06-20
64-bit arm_v:8 locale=en_GB.UTF-8 Threads:6 OPEN_MAX:1024
Compiler: 13.2.0 GCC 13.2.0
Linux : 6.18.0-rc7-edge-meson64 : #1 SMP PREEMPT Sun Nov 23 22:53:16 UTC 2025 : aarch64
PageSize:4KB THP:always hwcap:8FF:CRC32:SHA1:SHA2:AES:ASIMD
LE
1T CPU Freq (MHz): 1966 1985 1732 1940 1979 1946 1486
3T CPU Freq (MHz): 64% 424 97% 641
RAM size: 3773 MB, # CPU hardware threads: 6
RAM usage: 1334 MB, # Benchmark threads: 6
Compressing | Decompressing
Dict Speed Usage R/U Rating | Speed Usage R/U Rating
KiB/s % MIPS MIPS | KiB/s % MIPS MIPS
22: 1045 85 1191 1018 | 20252 91 1903 1727
23: 1078 90 1218 1099 | 18815 86 1889 1628
24: 1100 93 1274 1183 | 19644 92 1880 1724
25: 914 78 1332 1044 | 19697 94 1873 1753
---------------------------------- | ------------------------------
Avr: 1034 87 1253 1086 | 19602 91 1886 1708
Tot: 89 1570 1397
I have done similar tests on ODroid-M1 (rockchip), but nothing similar happens there.
What could be the reason?