With 6.5.0 I tested the effect of enabling hyper-threading on performance and it's bad.  Seems the kernel doesn't know 
that the extra CPU aren't real.

My testing shows that CPU 0-1 are the same, CPU 2-3 and so on. If I start a process with two threads, it's not much 
faster then having one thread only as the two threads are allocated to CPU0 (real) and CPU1 ( hyperthreading). If I 
start the program with
on -C0 and -C2 then I get the performance I expect.

Is there any option or way aside using "on" all over the place to make the kernel smarter about its cpu allocation?