On Thu, 2005-08-04 at 17:23 +0200, Borislav Petkov wrote: > 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.
The issue is that there are a number of laptops that do not properly support cpufreq and additionally newer laptop chips halt their TSC's when they go into C3 mode. This keeps the TSC from working as a proper timesource on these systems, and causes the need for alternative timesources like the ACPI PM timer. thanks -john - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
