Odroid XU4 Memcopy Slow on all Kernel 5.x 80MB/sec instead of 370+MB/sec
Kernel 4.14.186 – Fast. http://ix.io/2qxh
Kernel 5.4 – Slow
Kernel 5.7 – Slow http://ix.io/2qpX
odroid forum site admin thinks DRAM controller config could have issues on kernel 5
this patch for dynaminc timings was added around kernel 5.3 https://lwn.net/Articles/787647/
we’re using it
I agree with Lane, something is wrong with the driver/kernel to cause the behavior, I'd rather see it omitted for now
I think we should leave as is.
Tony made a good point that the issue is a defect, not a bad default configuration https://freenode.irclog.whitequark.org/armbian/2020-07-03#27409192
Typically tweaks via build scripts are done in the spirit of performance tuning on top a otherwise working default.
I think we should make a new ticket to follow-up periodically and re-enable whenever upstream or a patchset makes the governor work as intended
Improved on Kernel 5.4 as well http://ix.io/2qzC