On Tuesday 16 August 2005 00:18, john stultz wrote: > 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.
This _is_ actually my laptop I'm testing it on and sofar no problem. But as Steven pointed out earlier, one probably needs a different kind of timing information besides delta timings. Besides, <scripts/show_delta> can do all the formatting and delta computation already. Thanks & regards, Borislav Petkov. - 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/
