Charles Swiger wrote:

>
> Hmm, you also asked about how HZ affects performance and 
> responsiveness.  Let me dig up a related thread about changing HZ from 
> 100 to 1000 from a FreeBSD list:
>
Well looking at /usr/src/sys/kern/kern_clock.c I found out various hz 
values it expects, and experimented with them and it seems that the 
system responds under heavy load better with high hz values, but there 
is a penalty in terms of cpu usage. I guess it's all the overhead of 
generating interrupts at very short intervals

roman$ sysctl kern.clockrate
kern.clockrate: tick = 15, tickadj = 1, hz = 65536, profhz = 65536, 
stathz = 65536