Re: Why HZ on i386 is 100 ?

Alan Cox (alan@lxorguk.ukuu.org.uk)
Tue, 23 Apr 2002 08:08:31 +0100 (BST)

> The problem is in accounting (or time slicing if you prefer) where we
> need to start a timer each time a task is context switched to, and stop
> it when the task is switched away. The overhead is purely in the set up
> and tear down. MOST of these never expire.

Done properly on many platforms a variable tick is very very easy and also
very efficient to handle. X86 is a paticular problem case because the timer
is so expensive to fiddle with
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