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From: Andrey Smagin <samspeed@mail.ru>
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Subject: Strange hang HPET in current 
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In my box (amd64, current 20.oct.10 ) 
some time hang by 5-10 minutes with random subsystem, may 
hang disk access,network,very often tty. In most no output in log, 
sometimes with messages "calcru: .....". After 5-10 minutes it 
continue work again. When I disabled HPET in bios - problem gone.