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    [PATCH] x86_64: Fix drift with HPET timer enabled · b20367a6
    Jordan Hargrave 提交于
    If the HPET timer is enabled, the clock can drift by ~3 seconds a day.
    This is due to the HPET timer not being initialized with the correct
    setting (still using PIT count).
    
    If HZ changes, this drift can become even more pronounced.
    
    HPET patch initializes tick_nsec with correct tick_nsec settings for
    HPET timer.
    
    Vojtech comments:
    
      "It's not entirely correct (it assumes the HPET ticks totally
       exactly), but it's significantly better than assuming the PIT error
       there."
    Signed-off-by: NAndi Kleen <ak@suse.de>
    Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
    b20367a6
timer.c 40.6 KB