RPI3 swap experiments (r338342 with vm.pageout_oom_seq="1024")

[bob prohaska]

On Wed, Aug 15, 2018 at 03:55:04PM -0700, bob prohaska wrote:
> 
> When I started this goose chase, after zero problems with RPI2, I thought the
> issue was arm64-related and might be of some fundamental importance.
> 
> Thanks to many people I now understand it's a confluence of USB and flash memory
> artifacts, made evident by the demands of clang6. Elsewhere I noted that I'm seeking
> "the robustness of a Mars rover, using a rack server OS on a cellphone motherboard".
> 

With r338342  and
vm.pageout_oom_seq="1024"
in /boot/loader.conf the RPI3 is a bit closer to a Mars Rover.
No panics, crashes or USB errors, -j4 buildworld runs to completion.
When swap usage goes over about 50% the system slows, but doesn't give up.
There are six 1 GB swap partitions available, 3 on USB and 3 on microSD.

Log files are at
http://www.zefox.net/~fbsd/rpi3/swaptests/r338342/
for the combinations tried so far.

Thanks for reading, and everybody's help!

bob prohaska