Messages in this thread | | | Subject | Re: [PATCH] pmtmr and PRINTK_TIME timings display | From | Steven Rostedt <> | Date | Thu, 04 Aug 2005 11:44:45 -0400 |
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> I get it. Actually, I wasn't very sure whether this is the right solution > since my desktop machine uses tsc timer as default while the laptop the > pmtmr. I also remember that there was a patch a while ago on lkml which > enabled a modifiable behavior for PRINTK_TIME through a /proc interface and > kernel boot option but it somehow didn't get accepted. Ok, then, since we > keep the jiffies solution across arch's, how can I force the kernel to use > tsc for printk timings so that i can see the deltas between the different > printk's instead of the jiffies_64 ns value? The Pentium-M Centrino on the > laptop evidently supports rdtsc as a msr instruction after testing with this > small inline assembly snippet:
Just turn off the PM timer by disabling CONFIG_X86_PM_TIMER, then your laptop should just use the tsc timer.
>From make menuconfig:
Prompt: Power Management Timer Support │ │ Defined at drivers/acpi/Kconfig:307 │ │ Depends on: !X86_VOYAGER && !X86_VISWS && !IA64_HP_SIM && (IA64 || X8 │ │ Location: │ │ -> Power management options (ACPI, APM) │ │ -> ACPI (Advanced Configuration and Power Interface) Support │ │ -> ACPI Support (ACPI [=y])
-- Steve
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