Re: Interrupt frequency

jdebert wrote:
> Sahan Sanjeewa wrote:
> 
>> Hi,
>>
>> Can somebody tell me the usage (or the meaning) of the constant HZ in
>> /usr/src/linux-2.4/include/asm/param.h. Does it relate to the interrupt
>> frequency ?
>>
> 
> The HZ constant started out as a locale-dependent variable, and could be 
> either 50 or 60. The purpose and history of this is in a kernel howto 
> somewhere. Perhaps in the kernel-developer's howto.
> 
> It does relate to some critical timing, if I recall correctly.
> 
> It's been a long time since I read the kernel how-to's (since 0.99?) and 
> they could explain much better than I ever could.
> 
> 

I recall also that HZ affects counters that will change how the system 
operates and keeps system time. That seems fairly critical in itself.

=-=