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SubjectRe: IOAPIC and 8254
On Thu, Mar 02, 2000 at 07:55:29PM +0100, Maciej W. Rozycki wrote:

> As a source of the system time tick. We could probably use the RTC
> periodic interrupt instead, but HZ got fixed at 100 on i386 long time ago
> and the best approximation we can get from the RTC is 128 ;-) as it only
> allows powers of 2. Alphas use 1024 for HZ so they do not suffer from
> this problem.

I theory, it should be pretty safe to change the default value of HZ
except many userspace programs probably 100 as an assumption and may
give funny results.

People do increase HZ to much higher values (10000?) to be better
control over some kernel features such as CBQ.

-cw

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