default HZ value in 5.2.1

[Poul-Henning Kamp]

In message <40EEC665.5010608 at mac.com>, Chuck Swiger writes:
>Chris Stenton wrote:
>> Any reason why the default value for HZ is still set at 100?
>
>Sure.  Timer interrupts and context switching aren't free, you know: the 
>faster the HZ, the more time the system spends on overhead rather than doing 
>useful work.
>
>> Would not 1000 be better for finer granularity?
>
>Certainly it would, but tradeoffs exist....

Most of my systems run with HZ=1000 already, but that is hardly
ground for changes to the default.  What we need is some pro et
contra arguments, including benchmarks.



-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.