Messages in this thread | | | Date | Thu, 27 Nov 2008 22:35:42 +0000 (GMT) | From | Andrea Amerini <> | Subject | kernel 2.6.27.7 TSC calibration issue |
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- Kernel 2.6.27.7 doesn't use the right value for TSC calibration
I've updated my system (Slackware 12.1) to kernel 2.6.27.7 vanilla and looking in dmesg I read this:
TSC: PIT calibration deviates from PMTIMER: 2968361 3400012. TSC: Using PIT calibration value
But my cpu is :
cpu family : 15 model : 3 model name : Intel(R) Pentium(R) 4 CPU 3.40GHz stepping : 4
So the clock frequency detected is 3Ghz instead of 3,4 Ghz. Also bogomips are different:
for CPU0 I have this value: - bogomips : 5939.08 and for the CPU1 this one: - bogomips : 6802.52
Here it is some Kernel compilation flags of my .config:
# CONFIG_64BIT is not set CONFIG_X86_32=y # CONFIG_X86_64 is not set CONFIG_X86=y CONFIG_ARCH_DEFCONFIG="arch/x86/configs/i386_defconfig" # CONFIG_GENERIC_LOCKBREAK is not set CONFIG_GENERIC_TIME=y CONFIG_GENERIC_CMOS_UPDATE=y CONFIG_CLOCKSOURCE_WATCHDOG=y CONFIG_GENERIC_CLOCKEVENTS=y CONFIG_GENERIC_CLOCKEVENTS_BROADCAST=y CONFIG_LOCKDEP_SUPPORT=y CONFIG_STACKTRACE_SUPPORT=y CONFIG_HAVE_LATENCYTOP_SUPPORT=y CONFIG_FAST_CMPXCHG_LOCAL=y CONFIG_MMU=y CONFIG_ZONE_DMA=y CONFIG_GENERIC_ISA_DMA=y CONFIG_GENERIC_IOMAP=y CONFIG_GENERIC_BUG=y CONFIG_GENERIC_HWEIGHT=y # CONFIG_GENERIC_GPIO is not set CONFIG_ARCH_MAY_HAVE_PC_FDC=y # CONFIG_RWSEM_GENERIC_SPINLOCK is not set CONFIG_RWSEM_XCHGADD_ALGORITHM=y # CONFIG_ARCH_HAS_ILOG2_U32 is not set # CONFIG_ARCH_HAS_ILOG2_U64 is not set CONFIG_ARCH_HAS_CPU_IDLE_WAIT=y CONFIG_GENERIC_CALIBRATE_DELAY=y # CONFIG_GENERIC_TIME_VSYSCALL is not set CONFIG_ARCH_HAS_CPU_RELAX=y CONFIG_ARCH_HAS_CACHE_LINE_SIZE=y CONFIG_HAVE_SETUP_PER_CPU_AREA=y # CONFIG_HAVE_CPUMASK_OF_CPU_MAP is not set CONFIG_ARCH_HIBERNATION_POSSIBLE=y CONFIG_ARCH_SUSPEND_POSSIBLE=y # CONFIG_ZONE_DMA32 is not set CONFIG_ARCH_POPULATES_NODE_MAP=y # CONFIG_AUDIT_ARCH is not set CONFIG_ARCH_SUPPORTS_AOUT=y CONFIG_ARCH_SUPPORTS_OPTIMIZED_INLINING=y CONFIG_GENERIC_HARDIRQS=y CONFIG_GENERIC_IRQ_PROBE=y CONFIG_GENERIC_PENDING_IRQ=y CONFIG_X86_SMP=y CONFIG_X86_32_SMP=y CONFIG_X86_HT=y CONFIG_X86_BIOS_REBOOT=y CONFIG_X86_TRAMPOLINE=y CONFIG_KTIME_SCALAR=y CONFIG_PM=y # CONFIG_PM_DEBUG is not set CONFIG_PM_SLEEP_SMP=y CONFIG_PM_SLEEP=y CONFIG_SUSPEND=y CONFIG_SUSPEND_FREEZER=y CONFIG_HIBERNATION=y CONFIG_PM_STD_PARTITION="" CONFIG_ACPI=y CONFIG_ACPI_SLEEP=y CONFIG_ACPI_PROCFS=y CONFIG_ACPI_PROCFS_POWER=y CONFIG_ACPI_SYSFS_POWER=y CONFIG_ACPI_PROC_EVENT=y CONFIG_HPET_TIMER=y CONFIG_HPET_EMULATE_RTC=y CONFIG_X86_PM_TIMER=y
With 2.6.26.8 version of kernel everything was fine.
My mainboard is an Intel D915GEV with 3 Gb of ram.
Sorry if my bug-report is not totally correct,I'm a newbie with linux.
If you need, I'll be happy to give you any help or other info. Thanks for your time.
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