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List:       linux-wlan-devel
Subject:    [lwlan-devel]: HZ safe?
From:       linux-wlan-devel () absoval ! com (Stephen C !  Tweedie)
Date:       2000-01-10 16:30:10
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Hi,

On Sun, 9 Jan 2000 20:18:39 -0500 (EST), jamal <hadi@cyberus.ca> said:

> Setting HZ to be higher than 100 on anything lower than PPro 200 is not
> advisable.

> What ends happening is you get so many interupts from the timer your
> system is rendered almost useless i.e it can hardly do any useful work
> before the timer interupts again. 

The actual timer interrupt itself is pretty lightweight: taking it at
1000Hz shouldn't be that bad.  You will certainly not see the system
suddenly start rescheduling at 1000Hz: the scheduling quanta is a lot
longer than one clock tick.  

The biggest risk with the higher clock value is the risk of lost clock
ticks if you have very long-running interrupt service routines, but
otherwise it's not a big problem.

--Stephen
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