I found the advisory against using the HPET timer in the wiki FAQ, and disabled
both
CONFIG_HPET_TIMER
CONFIG_HPET_EMULATE_RTC
in my kernel config. Now I am having intermittent faults reading the TSC on my
x86 CPU.
Occasionally, reads of the TSC go backwards. The tracer also shows one of my
Xenomai
kernel threads going into an infinite loop reading the TSC:
:| +*end 0xffffff05 -798 0.675 common_interrupt+0x34
(do_gettimeofday+0x59)
: +*func -797 0.585 get_offset_tsc+0x8
(do_gettimeofday+0x2a)
: +*func -797 0.571 get_offset_tsc+0x8
(do_gettimeofday+0x2a)
: +*func -796 0.496 get_offset_tsc+0x8
(do_gettimeofday+0x2a)
...
ad infinitum
This behavior runs contrary to all the Xenomai configuration advice. I would
like
to keep the HPET timer disabled so I can eventually upgrade to Xenomai-2.3.
Any idea on what's happining with my HPET timer?
config:
linux-2.6.17.14
ipipe-1.5-00
xenomai-2.2.4
cpu = VIA Nehemiah
flags = fpu vme de pse tsc msr cx8 sep mtrr pge cmov pat mmx fxsr sse up rng
rng_en ace ace_en
motherboard: Hercules EBX
kernel config:
# CONFIG_M586TSC is not set
CONFIG_X86_TSC=y
# CONFIG_HPET_TIMER is not set
thanks,
--
Jeff Weber
American Superconductor Corp.
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