Messages in this thread | | | Subject | Re: Bug: timer going backward on a dual core | From | john stultz <> | Date | Fri, 28 Oct 2005 12:30:30 -0700 |
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On Fri, 2005-10-28 at 15:09 -0400, Claudio Scordino wrote: > Hi all. > > We have a dual-core AMD64 with the new kernel 2.6.14 and the > timer goes backward... > > > CONFIGURATION: > > Kernel: 2.6.14 > Distribution: Gentoo Linux 2005.0 > Processor: Athlon 64 x2 4200+ (dual core) > Motherboard: Abit KN8 > Memory: 1GB PC3200 > > > PROBLEM: > > gettimeofday goes backward and returns values that are not monotonic, > giving values that are smaller than values returned before. > > The system has been tested with timer as PIT, PIT/TSC and PM and the > problem occurs with all the configurations. > > Here is the config file that we used for the PM configuration. > > Any suggestion ?
Booting w/ idle=poll tends to work around this issue. You might check with your motherboard vendor for an updated BIOS that supports HPET or the ACPI PM timer.
thanks -john
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