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    SubjectRe: -mm -> 2.6.13 merge status (HZ -> 250?)
    FromLee Revell <>
    DateTue, 21 Jun 2005 12:26:31 -0400
    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.
    
    Lee
    
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