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I add a patch from https://git.kernel.org/pub/scm/linux/kernel/git/amlogic/linux.git/patch/?id=79482f3791c4760b9b0d8d9bfde9f1053ea3dd5e into my build (`userpatches/kernel/archive/meson64-6.18`) And success! 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-edge-meson64 : #1 SMP PREEMPT Sun Nov 30 22:42:10 UTC 2025 : aarch64 PageSize:4KB THP:always hwcap:8FF:CRC32:SHA1:SHA2:AES:ASIMD LE 1T CPU Freq (MHz): 1887 1899 1901 1901 1903 1903 1903 3T CPU Freq (MHz): 299% 1904 300% 1903 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: 7750 530 1423 7540 | 135098 544 2118 11518 23: 7635 541 1438 7780 | 134250 551 2106 11614 24: 7469 535 1502 8032 | 131036 551 2089 11498 25: 7334 545 1537 8374 | 129234 552 2085 11501 ---------------------------------- | ------------------------------ Avr: 7547 538 1475 7931 | 132404 549 2099 11533 Tot: 544 1787 9732 @c0rnelius, you hit them! Thank you!!!

I did a bisect. 3381d25b77fbf1ebaaa151a9f2be66fbf1ca3a1e is the first bad commit commit 3381d25b77fbf1ebaaa151a9f2be66fbf1ca3a1e Author: Ricardo Pardini <ricardo@pardini.net> Date: Sun Oct 12 19:57:32 2025 +0200 I try to build 6.18 kernel with config file linux-meson64-edge.config taken from "good" 6.17 kernel. but result was a "slow" kernel. Before I hope to find "bad" change in kernel config, now it's clear problem not there. I have no more ideas 😢

Seems you are using redhat kernel. it means something wrong changed in armbian meson64 kernel config after 6.16.??

After updating the edge kernel 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?

I build fresh Armbian-unofficial_25.02.0-trunk_Helios4_plucky_edge_6.10.14 from armbian trunk (1f697206562). Image boots successfuly. Why?

I did kind of manual bisect by commits to config/boards/odroidm1.conf U-Boot 2024.04-armbian (Jan 29 2025 - 02:13:41 +0000) commit 3215bf9f3699c2ee4bc741efe82065315e4ff46f linux-u-boot-odroidm1-edge_24.8.0-trunk_arm64__2024.04-S2504-P3b44-Haddb-V73be-B4f92-R448a.deb is GOOD, U-Boot 2024.07-armbian-2024.07-S3f77-P7e9c-Hfb3e-V8f4f-Bb66d-R448a (Jan 29 2025 - 02:30:21 +0000) commit 268c2e85960978c90025bc18cf7d5f8e5cfbdab6 linux-u-boot-odroidm1-edge_24.8.0-trunk_arm64__2024.07-S3f77-P7e9c-Hfb3e-V8f4f-Bb66d-R448a.deb is BAD then I fix my Odroid M1 by doing sudo apt install ./linux-u-boot-odroidm1-edge_24.8.0-trunk_arm64__2024.04-S2504-P3b44-Haddb-V73be-B4f92-R448a.deb then armbian-install → Install/Update the bootloader on MTD Flash