Messages in this thread | | | Date | Sun, 17 Feb 2002 08:34:20 -0800 | From | Dan Kegel <> | Subject | time goes backwards periodically on laptop if booted in low-power mode |
| |
My Toshiba laptop (running stock Red Hat 7.2, kernel 2.4.7-10) appears to suffer from a power management-related time hiccup: when I boot in low-power mode, then switch to high-power mode, time goes backwards by 10ms several times a second. According to the thread Subject: [PATCH]: allow notsc option for buggy cpus From: Anton Blanchard <anton@linuxcare.com.au> Date: 2001-03-10 0:58:29 http://marc.theaimsgroup.com/?l=linux-kernel&m=98418670406359&w=2 this can be fixed by disabling the TSC option, but there ought to be a runtime fix. Was a runtime fix ever put together for this situation?
FWIW, the system is a Toshiba Satellite 2805, and /proc/cpuinfo reports
processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 8 model name : Pentium III (Coppermine) stepping : 6 cpu MHz : 746.342 cache size : 256 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 mmx fxsr sse bogomips : 1490.94
when booted in high power mode; when booted in low power mode, /proc/cpuinfo changes as follows:
7c7 < cpu MHz : 746.342 --- > cpu MHz : 383.295 18c18 < bogomips : 1490.94 --- > bogomips : 750.38
- Dan
p.s. there were three other (unresolved?) threads about similar time problems, but I don't think I'm suffering from these.
Subject: gettimeofday question From: Russell King <rmk@arm.linux.org.uk> Date: 2001-03-03 12:49:04 http://marc.theaimsgroup.com/?l=linux-kernel&m=98362388532220&w=2
Subject: 40ms/10ms error in do_gettimeofday() From: Bernard Imbert <imbert@ipanematech.com> Date: 2000-04-04 10:15:57 http://marc.theaimsgroup.com/?l=linux-kernel&m=95484334731324&w=2
Subject: problems with do_slow_gettimeoffset() From: Jason Sodergren <jason@mugwump.taiga.com> Date: 2000-03-30 22:35:36 http://marc.theaimsgroup.com/?l=linux-kernel&m=95445682624501&w=2 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |