zamnuts

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  1. I ran a some tests the past few days, all nodes are stable using the "performance" governor and the 1.5ghz/2ghz cpu frequencies. Nodes: 1x m4v2 on kernel 4.4.213 (w/ SATA hat) 3x m4v2 on kernel 5.8.6 1x m4 (v1) on kernel 4.4.213 sysfs configuration: $ tail -n+1 /etc/sysfs.d/* ==> /etc/sysfs.d/cpufreq-policy0.conf <== devices/system/cpu/cpufreq/policy0/scaling_governor = performance devices/system/cpu/cpufreq/policy0/scaling_max_freq = 1512000 devices/system/cpu/cpufreq/policy0/scaling_min_freq = 408000 # enable sampling_rate if scaling_governor
  2. While trying to determine faulty RAM on one board, I noticed the ondemand governor w/ the revised frequencies and sampling rate it isn't as stable as it appears. So I decided to run a test using memtester using most of the left over RAM while the system was up, e.g. `memtester 3550M 7`: All boards have max cpu freq set at 1416000 and 1800000 1x m4v2 using 4.4 and governor "ondemand" 3x m4v2 using 5.8 and governor "ondemand" 1x m4 (v1) using 4.4 and governor "interactive" Results: All 3 boards w/ 5.8 showed at least one memtester failure per l
  3. I noticed that the ondemand sampling_rate was low in 5.x compared to 4.4's default. compare below: $ uname -r 4.4.213-rk3399 $ sudo cat /sys/devices/system/cpu/cpufreq/policy{0,4}/ondemand/sampling_rate 40000 465000 vs $ uname -r 5.8.15-rockchip64 $ sudo cat /sys/devices/system/cpu/cpufreq/policy{0,4}/ondemand/sampling_rate 10000 10000 It appears that 10000 seems to be a default (or the minimum value possible). Per https://www.kernel.org/doc/Documentation/cpu-freq/governors.txt 10000 is too low given the cpu_transition_latency: $ uname -r 5.8.15
  4. I might as well chime in here... I've been battling this problem for nearly a year, all the while periodically checking various threads. I've gone through many hardware and software iterations to troubleshoot. Just going to do a dump of everything up to this point, apologies for the long post. I'm willing to try any builds, configs, and pretty much anything else anyone can think of, short of soldering, to figure out what is going on. Setup: 1x nanopi m4v2 w/ 4x SATA hat (friendlyelec) powered by a brick/barrel connector "ALITOVE 12V 8A 96W" 3x nanopi m4v2