Re: timecounter TSC on Core i7

[Paul Goyette <paul%whooppee.com@localhost>]

My Core-i7 also picks TSC...

{105} grep counter /var/run/dmesg.boot
timecounter: Timecounters tick every 10.000 msec
timecounter: Timecounter "i8254" frequency 1193182 Hz quality 100
timecounter: Timecounter "ACPI-Fast" frequency 3579545 Hz quality 1000
timecounter: Timecounter "hpet0" frequency 14318179 Hz quality 2000
timecounter: Timecounter "clockinterrupt" frequency 100 Hz quality 0
timecounter: Timecounter "TSC" frequency 2672859040 Hz quality 3000
{106} sysctl kern.timecounter
kern.timecounter.choice = TSC(q=3000, f=2672859040 Hz) clockinterrupt(q=0, 
f=100 Hz) hpet0(q=2000, f=14318179 Hz) ACPI-Fast(q=1000, f=3579545 Hz) 
lapic(q=-100, f=133693674 Hz) i8254(q=100, f=1193182 Hz) dummy(q=-1000000, 
f=1000000 Hz)
kern.timecounter.hardware = TSC
kern.timecounter.timestepwarnings = 0
{107}

And it also seems to have some "issues" with NTP time-keeping:

{107} tail /var/log/messages
Sep 14 23:06:05 bolt ntpd[274]: kernel time sync status change 
0x2001<PLL,NANO,MODE=0x0=PLL,CLK=0x0=A>
Sep 15 00:14:26 bolt ntpd[274]: kernel time sync status change 
0x6001<PLL,NANO,MODE=0x1=FLL,CLK=0x0=A>
Sep 15 00:31:30 bolt ntpd[274]: kernel time sync status change 
0x2001<PLL,NANO,MODE=0x0=PLL,CLK=0x0=A>
Sep 15 01:39:49 bolt ntpd[274]: kernel time sync status change 
0x6001<PLL,NANO,MODE=0x1=FLL,CLK=0x0=A>
Sep 15 02:13:55 bolt ntpd[274]: kernel time sync status change 
0x2001<PLL,NANO,MODE=0x0=PLL,CLK=0x0=A>
Sep 15 03:30:51 bolt ntpd[274]: kernel time sync status change 
0x6001<PLL,NANO,MODE=0x1=FLL,CLK=0x0=A>
Sep 15 04:22:07 bolt ntpd[274]: kernel time sync status change 
0x2001<PLL,NANO,MODE=0x0=PLL,CLK=0x0=A>
Sep 15 06:21:44 bolt ntpd[274]: kernel time sync status change 
0x6001<PLL,NANO,MODE=0x1=FLL,CLK=0x0=A>
Sep 15 08:04:13 bolt ntpd[274]: kernel time sync status change 
0x2001<PLL,NANO,MODE=0x0=PLL,CLK=0x0=A>
Sep 15 11:11:56 bolt ntpd[274]: kernel time sync status change 
0x6001<PLL,NANO,MODE=0x1=FLL,CLK=0x0=A>
{108}


Would hpet be a better choice for timecounter?



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