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Low performance on N2 if kernel version 6.17+

iav

By iav
in Odroid N2/N2+

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Go to solution Solved by c0rnelius,

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iav

iav

Posted
Posted (edited)

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?

Edited by iav
removed an unconfirmed mention of 6.17
0
usual user

usual user

Posted
Posted
10 hours ago, iav said:

What could be the reason?

Is see no significant differences: 

********************************************************************************
ssd-006
Hardkernel ODROID-N2Plus
CPU 0-1: performance 1000 MHz - 2016 MHz
CPU 2-5: performance 1000 MHz - 2400 MHz
GPU: performance 124 MHz - 799 MHz
6.16.0-0.rc1.17.fc43.aarch64 #1 SMP PREEMPT_DYNAMIC Sat Jun 14 11:19:02 CEST 2025
********************************************************************************
7z b

7-Zip 24.09 (arm64) : Copyright (c) 1999-2024 Igor Pavlov : 2024-11-29
 64-bit arm_v:8-A locale=en_US.UTF-8 Threads:6 OPEN_MAX:1024

Compiler:  ver:15.2.1 20250924 (Red Hat 15.2.1-2) GCC 15.2.1 : UNALIGNED
Linux : 6.16.0-0.rc1.17.fc43.aarch64 : #1 SMP PREEMPT_DYNAMIC Sat Jun 14 11:19:02 CEST 2025 : aarch64
PageSize:4KB THP:madvise hwcap:8FF:CRC32:SHA1:SHA2:AES:ASIMD
arm64

1T CPU Freq (MHz):  2092  2387  2384  2390  2361  2389  2388
3T CPU Freq (MHz): 282% 2239   296% 2352..
6T CPU Freq (MHz): 538% 2040   497% 1893..

RAM size:    3740 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:       7107   508   1362   6914  |     141426   488   2473  12058
23:       6459   494   1332   6581  |     136949   489   2421  11847
24:       6268   508   1327   6740  |     132118   485   2390  11593
25:       5695   515   1264   6503  |     127085   483   2343  11310
----------------------------------  | ------------------------------
Avr:      6382   506   1321   6684  |     134394   486   2407  11702
Tot:             496   1864   9193
********************************************************************************
ssd-006
Hardkernel ODROID-N2Plus
CPU 0-1: performance 1000 MHz - 2016 MHz
CPU 2-5: performance 1000 MHz - 2400 MHz
GPU: performance 124 MHz - 799 MHz
6.18.0-0.rc3.30.fc44.aarch64 #1 SMP PREEMPT_DYNAMIC Mon Oct 27 21:17:35 CET 2025
********************************************************************************
7z b

7-Zip 24.09 (arm64) : Copyright (c) 1999-2024 Igor Pavlov : 2024-11-29
 64-bit arm_v:8-A locale=en_US.UTF-8 Threads:6 OPEN_MAX:1024

Compiler:  ver:15.2.1 20250924 (Red Hat 15.2.1-2) GCC 15.2.1 : UNALIGNED
Linux : 6.18.0-0.rc3.30.fc44.aarch64 : #1 SMP PREEMPT_DYNAMIC Mon Oct 27 21:17:35 CET 2025 : aarch64
PageSize:4KB THP:madvise hwcap:8FF:CRC32:SHA1:SHA2:AES:ASIMD
arm64

1T CPU Freq (MHz):  2365  2380  2383  2390  2389  2391  2388
3T CPU Freq (MHz): 277% 2162   274% 2095..
6T CPU Freq (MHz): 533% 2021   508% 1926..

RAM size:    3737 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:       6924   491   1373   6737  |     136783   473   2465  11662
23:       6586   495   1356   6711  |     141391   506   2418  12232
24:       6240   494   1359   6709  |     138310   510   2382  12137
25:       5912   507   1330   6750  |     127792   487   2337  11373
----------------------------------  | ------------------------------
Avr:      6415   497   1355   6727  |     136069   494   2401  11851
Tot:             495   1878   9289

 

0
iav

iav

Posted
  • Author
Posted

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 😢

0
c0rnelius

c0rnelius

Posted
Posted

I haven't personally had issue with 6.17.y, but 6.18.y is a mess on meson-g12. It is basically unusable in my opinion. PCIe is hosed, even the patch that kind of fixes the issue just makes the error go away and doesn't fix the underlining problem "performance". I also get topology errors, but as I haven't really seen anyone yet complain about that, I'm assuming its me.

 

For my personal use, I will be sticking with 6.12.y until things get sorted.

 

 

0
iav

iav

Posted
  • Author
Posted

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!!!

0
usual user

usual user

Posted
Posted
5 hours ago, c0rnelius said:

Yeap. One fixes topology and the other pcie performance.

It works for me without the DT fix as well, but PCIe doesn't work for me at all, even with the referenced patch.
But I suppose it's because the device discussed in this thread doesn't have any PCIe hardware support at all.

0

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