Hammy Posted November 20, 2020 Posted November 20, 2020 Armbianmonitor: http://ix.io/2ES2 Good evening, I ran into some problems with sbc-bench on a couple of Allwinner boards Orange Pi Zero, Orange Pi Zero+, Orange Pi One and Nanopi Neo 2 spcifically. The 7 Zip benchmark causes the following error: ./sbc-bench.sh: Zeile 611: 4206 Bus-Zugriffsfehler "${SevenZip}" b >> ${TempLog} Most likely due to a problem with the ZRam: zram: Decompression failed! err=-22 This happens on all boards under Debian and focal with different SD cards and power supplies. The benchmark ran previously on this setups without any issues – unfortunately I don’t know when it stopped working and hence cannot narrow down the change that caused the problem. The benchmark results and armbianmonitor output from the Orange Pi one as an example: http://ix.io/2EPZ http://ix.io/2ES2 Is this a known issue? Is there a solution? Daniel
Hammy Posted November 21, 2020 Author Posted November 21, 2020 Small update: going back to Armbian 20.08.17 Buster with Linux 5.4.62-sunxi64 "solves" the problem. http://ix.io/2EYt Can anyone confirm this behavior? Daniel
Igor Posted November 21, 2020 Posted November 21, 2020 I didn't checked yet, but I read on OpenHAb forum that their ZRAM implementation is failing. On Rpi. Which makes me believe the problem comes from the upstream.
Icenowy Posted November 22, 2020 Posted November 22, 2020 Could you try to switch the ZRAM algorithm to zstd to try out? This seems to be fixing issue when I try to port Armbian to PineCube.
Hammy Posted November 22, 2020 Author Posted November 22, 2020 Thanks for the info, is there any work around? Switching to zstd caused the same error and crashed the board while benchmarking. After a reboot: http://ix.io/2F3t - Interestingly it says: ### Activated 1 lzo-rle zram swap devices with 491 MB each While root@orangepizero:~# zramctl NAME ALGORITHM DISKSIZE DATA COMPR TOTAL STREAMS MOUNTPOINT /dev/zram1 zstd 491,6M 4K 58B 4K 4 [SWAP] /dev/zram0 zstd 50M 1,4M 184,1K 572K 4 /var/log Daniel
Icenowy Posted November 24, 2020 Posted November 24, 2020 @IgorSeems to be https://lore.kernel.org/linux-mm/20201105170249.387069-1-minchan@kernel.org/ . By the way in mainline kernel the "fix" seems to be dropping ZSMALLOC_PGTABLE_MAPPING , see https://www.spinics.net/lists/stable/msg428110.html (it's already in linux-next).
Solution Icenowy Posted November 24, 2020 Solution Posted November 24, 2020 https://github.com/armbian/build/pull/2377 Tested to fix the issue.
Hammy Posted November 24, 2020 Author Posted November 24, 2020 Awesome guys, when will the change be in the current build? Out of curiosity: What is “ZSMALLOC_PGTABLE_MAPPING“ actually doing?
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