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/
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