t_delta too long or short

Hi all,

running 8.0BETA with bootverbose currently, and I notice the following
recurring kernel output:

t_delta 15.fe9640b115166d14 too short
t_delta 15.fee2074e546b65c6 too short
t_delta 15.fdd3965ad0e1cb1c too short
t_delta 16.010a6ee0b107cf1c too long
t_delta 15.fece4884c256229a too short
t_delta 16.0124b33bf29dc2d8 too long
t_delta 15.fdcf9fd4d4cf1482 too short
t_delta 16.012bf763f1609fee too long
t_delta 16.011f5e6d41ebf2c8 too long
t_delta 15.fe33466a7df7416c too short
...

Some more information:

Timecounter "i8254" frequency 1193182 Hz quality 0
Calibrating TSC clock ... TSC clock: 3332972180 Hz
CPU: Intel(R) Core(TM)2 Duo CPU     E8600  _at_ 3.33GHz (3332.97-MHz K8-class CPU)
  Origin = "GenuineIntel"  Id = 0x1067a  Stepping = 10
  Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
  Features2=0x408e3fd<SSE3,DTES64,MON,DS_CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,XSAVE>
  AMD Features=0x20100800<SYSCALL,NX,LM>
  AMD Features2=0x1<LAHF>
  TSC: P-state invariant
real memory  = 4294967296 (4096 MB)
...
ACPI timer: 1/1 1/1 1/1 1/1 1/1 1/1 1/1 1/1 1/1 1/1 -> 10
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x808-0x80b on acpi0
...
acpi_hpet0: <High Precision Event Timer> iomem 0xfed00000-0xfed003ff on acpi0
acpi_hpet0: vend: 0x8086 rev: 0x1 num: 3 hz: 14318180 opts: legacy_route 64-bit
Timecounter "HPET" frequency 14318180 Hz quality 900
...
Timecounter "TSC" frequency 3332972180 Hz quality -100
Timecounters tick every 10.000 msec


some sysctl output:
kern.timecounter.tick: 1
kern.timecounter.choice: TSC(-100) HPET(900) ACPI-fast(1000) i8254(0) dummy(-1000000)
kern.timecounter.hardware: ACPI-fast
kern.timecounter.stepwarnings: 0
kern.timecounter.tc.i8254.mask: 65535
kern.timecounter.tc.i8254.counter: 41309
kern.timecounter.tc.i8254.frequency: 1193182
kern.timecounter.tc.i8254.quality: 0
kern.timecounter.tc.ACPI-fast.mask: 16777215
kern.timecounter.tc.ACPI-fast.counter: 13709372
kern.timecounter.tc.ACPI-fast.frequency: 3579545
kern.timecounter.tc.ACPI-fast.quality: 1000
kern.timecounter.tc.HPET.mask: 4294967295
kern.timecounter.tc.HPET.counter: 906312624
kern.timecounter.tc.HPET.frequency: 14318180
kern.timecounter.tc.HPET.quality: 900
kern.timecounter.tc.TSC.mask: 4294967295
kern.timecounter.tc.TSC.counter: 1286877466
kern.timecounter.tc.TSC.frequency: 3332972180
kern.timecounter.tc.TSC.quality: -100
kern.timecounter.smp_tsc: 0
kern.timecounter.invariant_tsc: 1

While I have powerd running usually, the messages also appear when
powerd is not running and the CPUs are fixed to C1 state.

Shall I worry? Is this normal and expected?

Cheers,
Ulrich Spörlein