Re: Why HZ on i386 is 100 ?

Ben Greear
2002-04-17T03:19:20Z

David Mosberger wrote:

> The last time I measured timer tick overhead on ia64 it was well below
> 1% of overhead. I don't really like using kernel builds as a
> benchmark, because there are far too many variables for the results to
> have any long-term or cross-platform value. But since it's popular, I
> did measure it quickly on a relatively slow (old) Itanium box: with
> 100Hz, the kernel compile was about 0.6% faster than with 1024Hz
> (2.4.18 UP kernel).

How hard would it be to tune HZ dynamically at run time, either through
kernel smarts, or driven from user space by some sort of daemon or other
(manual) control?

Ben

--
Ben Greear <greearb@candelatech.com> <Ben_Greear AT excite.com>
President of Candela Technologies Inc http://www.candelatech.com
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