Date: Thu, 23 Jun 2011 10:21:26 +0200 From: Ian FREISLICH <ianf@clue.co.za> To: Jung-uk Kim <jkim@FreeBSD.org> Cc: freebsd-current@FreeBSD.org Subject: Re: Time keeping Issues with the low-resolution TSC timecounter Message-ID: <E1QZfAE-0001ql-MD@clue.co.za> In-Reply-To: <201106211704.04285.jkim@FreeBSD.org> References: <201106211704.04285.jkim@FreeBSD.org> <201106171323.43864.jkim@FreeBSD.org> <201106171455.00088.jkim@FreeBSD.org> <201106211653.34894.jkim@FreeBSD.org>
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Jung-uk Kim wrote: > On Tuesday 21 June 2011 04:53 pm, Jung-uk Kim wrote: > > Can you please try the attached patch? It should disable > > TSC/TSC-low timecounter for your CPU models, I think. > > Sorry, I attached a wrong patch. Please ignore the previous one and > try this, instead. TSC-low is not presented as an option any more: CPU: Intel(R) Atom(TM) CPU N270 @ 1.60GHz (1596.03-MHz 686-class CPU) Origin = "GenuineIntel" Id = 0x106c2 Family = 6 Model = 1c Stepping = 2 Features=0xbfe9fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE> Features2=0x40c39d<SSE3,DTES64,MON,DS_CPL,EST,TM2,SSSE3,xTPR,PDCM,MOVBE> AMD Features2=0x1<LAHF> TSC: P-state invariant, performance statistics Event timer "LAPIC" quality 400 Timecounter "ACPI-fast" frequency 3579545 Hz quality 900 acpi_timer0: <24-bit timer at 3.579545MHz> port 0x408-0x40b on acpi0 atrtc0: <AT realtime clock> port 0x70-0x77 on acpi0 atrtc0: Warning: Couldn't map I/O. Event timer "RTC" frequency 32768 Hz quality 0 hpet0: <High Precision Event Timer> iomem 0xfed00000-0xfed003ff irq 0,8 on acpi0 Timecounter "HPET" frequency 14318180 Hz quality 950 Event timer "HPET" frequency 14318180 Hz quality 450 Event timer "HPET1" frequency 14318180 Hz quality 440 Event timer "HPET2" frequency 14318180 Hz quality 440 attimer0: <AT timer> port 0x40-0x43,0x50-0x53 on acpi0 Timecounter "i8254" frequency 1193182 Hz quality 0 Event timer "i8254" frequency 1193182 Hz quality 100 kern.timecounter.choice: TSC(-1000) i8254(0) HPET(950) ACPI-fast(900) dummy(-1000000) -- Ian Freislich
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