Re: -mm -> 2.6.13 merge status (HZ -> 250?)

From: Lee Revell
Date: Tue Jun 21 2005 - 11:48:10 EST

On Mon, 2005-06-20 at 23:54 -0700, Andrew Morton wrote:
> CONFIG_HZ for x86 and ia64: changes default HZ to 250, make HZ
> Kconfigurable.
> Will merge (will switch default to 1000 Hz later if that seems
> necessary)

How about delaying this until the high res timers patches are ready?
That way you can save power and avoid the latency regression, in fact it
would be a huge improvement from user POV.

Consider a program with a 5ms RT constraint, like a game or mplayer.
Currently it uses the RTC on 2.4/HZ=100 systems and usleep() on
2.6/HZ=1000. Allowing HZ to regress to 250 would force us to handle
2.4, 2.6.1 - 2.6.12, and 2.6.13+ separately. It would be a huge mess.


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