Correct. When I ran it with the default settings out of the box I think I got around 250 also. Here is my cpu.txt:
"cpu_threads_conf" :
[
{ "low_power_mode" : 5, "no_prefetch" : true, "affine_to_cpu" : 0 },
{ "low_power_mode" : 5, "no_prefetch" : true, "affine_to_cpu" : 1 },
{ "low_power_mode" : 5, "no_prefetch" : true, "affine_to_cpu" : 2 },
{ "low_power_mode" : 5, "no_prefetch" : true, "affine_to_cpu" : 3 },
{ "low_power_mode" : 5, "no_prefetch" : true, "affine_to_cpu" : 4 },
{ "low_power_mode" : 5, "no_prefetch" : true, "affine_to_cpu" : 5 },
{ "low_power_mode" : 5, "no_prefetch" : true, "affine_to_cpu" : 6 },
{ "low_power_mode" : 5, "no_prefetch" : true, "affine_to_cpu" : 7 },
],
In most situations you wouldn't mine using the hyperthreads let alone affine to them, but I think this low power mode must be less cpu intensive at the cost of more memory.
In /etc/security/limits.conf I also added the following 2 lines:
* soft memlock 262144
* hard memlock 262144
and in /etc/sysctl.conf added:
vm.nr_hugepages=128
I was seeing ~585 from mine with your settings until thermal throttle. Finally got it going under Ubuntu Linux.
Cool little box indeed. Now to mess with keeping it cool & maintaining the speed.
Settles into mid to high 400s after warming up. Maybe I'll put it in my garage for the winter, haha!