kern/173541: load average 0.60 at 100% idle

Johan Broman je.broman at gmail.com
Thu Jan 3 22:20:01 UTC 2013


The following reply was made to PR kern/173541; it has been noted by GNATS.

From: Johan Broman <je.broman at gmail.com>
To: bug-followup at FreeBSD.org
Cc: viktor.stujber at gmail.com
Subject: Re: kern/173541: load average 0.60 at 100% idle
Date: Thu, 3 Jan 2013 23:19:00 +0100

 --089e01177699f745b904d269bf93
 Content-Type: text/plain; charset=ISO-8859-1
 
 Hi!
 
 I'm getting the exact same issue. Upgraded from FreeBSD 9.0 to FreeBSD 9.1
 and my load avg jumped from 0.01 to 0.60, while the server is doing pretty
 much nothing at all.
 
 I'm also seeing the timer differences in dmesg as described earlier in the
 bug report.
 
 # sysctl -a | egrep "kern.event|clock"
 kern.clockrate: { hz = 1000, tick = 1000, profhz = 8126, stathz = 127 }
 kern.eventtimer.choice: HPET(450) HPET1(440) HPET2(440) LAPIC(400)
 i8254(100) RTC(0)
 kern.eventtimer.et.LAPIC.flags: 15
 kern.eventtimer.et.LAPIC.frequency: 0
 kern.eventtimer.et.LAPIC.quality: 400
 kern.eventtimer.et.i8254.flags: 1
 kern.eventtimer.et.i8254.frequency: 1193182
 kern.eventtimer.et.i8254.quality: 100
 kern.eventtimer.et.RTC.flags: 17
 kern.eventtimer.et.RTC.frequency: 32768
 kern.eventtimer.et.RTC.quality: 0
 kern.eventtimer.et.HPET.flags: 3
 kern.eventtimer.et.HPET.frequency: 14318180
 kern.eventtimer.et.HPET.quality: 450
 kern.eventtimer.et.HPET1.flags: 3
 kern.eventtimer.et.HPET1.frequency: 14318180
 kern.eventtimer.et.HPET1.quality: 440
 kern.eventtimer.et.HPET2.flags: 3
 kern.eventtimer.et.HPET2.frequency: 14318180
 kern.eventtimer.et.HPET2.quality: 440
 kern.eventtimer.periodic: 0
 kern.eventtimer.timer: HPET
 kern.eventtimer.activetick: 1
 kern.eventtimer.idletick: 0
 kern.eventtimer.singlemul: 2
 debug.acpi.reset_clock: 1
 debug.clocktime: 0
 hw.clockrate: 2133
 machdep.wall_cmos_clock: 0
 dev.atrtc.0.%desc: AT realtime clock
 
 
 # dmesg | more
 Copyright (c) 1992-2012 The FreeBSD Project.
 Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
         The Regents of the University of California. All rights reserved.
 FreeBSD is a registered trademark of The FreeBSD Foundation.
 FreeBSD 9.1-RELEASE #0 r243825: Tue Dec  4 09:23:10 UTC 2012
     root at farrell.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64
 CPU: Intel(R) Core(TM)2 CPU          6400  @ 2.13GHz (2133.45-MHz K8-class
 CPU)
   Origin = "GenuineIntel"  Id = 0x6f2  Family = 6  Model = f  Stepping = 2
 
 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=0xe3bd<SSE3,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM>
   AMD Features=0x20100800<SYSCALL,NX,LM>
   AMD Features2=0x1<LAHF>
   TSC: P-state invariant, performance statistics
 real memory  = 4296015872 (4097 MB)
 avail memory = 4101558272 (3911 MB)
 Event timer "LAPIC" quality 400
 ACPI APIC Table: <COMPAQ GLENWOOD>
 FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
 FreeBSD/SMP: 1 package(s) x 2 core(s)
  cpu0 (BSP): APIC ID:  0
  cpu1 (AP): APIC ID:  1
 ioapic0: Changing APIC ID to 1
 ioapic0 <Version 2.0> irqs 0-23 on motherboard
 kbd1 at kbdmux0
 acpi0: <HPQOEM SLIC-WKS> on motherboard
 acpi0: Power Button (fixed)
 acpi0: reservation of 0, a0000 (3) failed
 acpi0: reservation of 100000, dff00000 (3) failed
 cpu0: <ACPI CPU> on acpi0
 cpu1: <ACPI CPU> on acpi0
 attimer0: <AT timer> port 0x40-0x43 irq 0 on acpi0
 Timecounter "i8254" frequency 1193182 Hz quality 0
 Event timer "i8254" frequency 1193182 Hz quality 100
 atrtc0: <AT realtime clock> port 0x70-0x71 irq 8 on acpi0
 Event timer "RTC" frequency 32768 Hz quality 0
 hpet1: <High Precision Event Timer> iomem 0xfed00000-0xfed003ff on acpi0
 Event timer "HPET" frequency 14318180 Hz quality 450
 Event timer "HPET1" frequency 14318180 Hz quality 440
 Event timer "HPET2" frequency 14318180 Hz quality 440
 hpet0: <High Precision Event Timer> iomem 0xfed00000-0xfed003ff on acpi0
 device_attach: hpet0 attach returned 12
 Timecounter "ACPI-fast" frequency 3579545 Hz quality 900
 acpi_timer0: <24-bit timer at 3.579545MHz> port 0xf808-0xf80b on acpi0
 
 Regards
 Johan
 
 --089e01177699f745b904d269bf93
 Content-Type: text/html; charset=ISO-8859-1
 Content-Transfer-Encoding: quoted-printable
 
 Hi!<br><br>I'm getting the exact same issue. Upgraded from FreeBSD 9.0 =
 to FreeBSD 9.1 and my load avg jumped from 0.01 to 0.60, while the server i=
 s doing pretty much nothing at all.<br><br>I'm also seeing the timer di=
 fferences in dmesg as described earlier in the bug report. <br>
 <br># sysctl -a | egrep "kern.event|clock" <br>kern.clockrate: { =
 hz =3D 1000, tick =3D 1000, profhz =3D 8126, stathz =3D 127 }<br>kern.event=
 timer.choice: HPET(450) HPET1(440) HPET2(440) LAPIC(400) i8254(100) RTC(0)<=
 br>kern.eventtimer.et.LAPIC.flags: 15<br>
 kern.eventtimer.et.LAPIC.frequency: 0<br>kern.eventtimer.et.LAPIC.quality: =
 400<br>kern.eventtimer.et.i8254.flags: 1<br>kern.eventtimer.et.i8254.freque=
 ncy: 1193182<br>kern.eventtimer.et.i8254.quality: 100<br>kern.eventtimer.et=
 .RTC.flags: 17<br>
 kern.eventtimer.et.RTC.frequency: 32768<br>kern.eventtimer.et.RTC.quality: =
 0<br>kern.eventtimer.et.HPET.flags: 3<br>kern.eventtimer.et.HPET.frequency:=
  14318180<br>kern.eventtimer.et.HPET.quality: 450<br>kern.eventtimer.et.HPE=
 T1.flags: 3<br>
 kern.eventtimer.et.HPET1.frequency: 14318180<br>kern.eventtimer.et.HPET1.qu=
 ality: 440<br>kern.eventtimer.et.HPET2.flags: 3<br>kern.eventtimer.et.HPET2=
 .frequency: 14318180<br>kern.eventtimer.et.HPET2.quality: 440<br>kern.event=
 timer.periodic: 0<br>
 kern.eventtimer.timer: HPET<br>kern.eventtimer.activetick: 1<br>kern.eventt=
 imer.idletick: 0<br>kern.eventtimer.singlemul: 2<br>debug.acpi.reset_clock:=
  1<br>debug.clocktime: 0<br>hw.clockrate: 2133<br>machdep.wall_cmos_clock: =
 0<br>
 dev.atrtc.0.%desc: AT realtime clock<br><br><br># dmesg | more<br>Copyright=
  (c) 1992-2012 The FreeBSD Project.<br>Copyright (c) 1979, 1980, 1983, 1986=
 , 1988, 1989, 1991, 1992, 1993, 1994<br>=A0=A0=A0=A0=A0=A0=A0 The Regents o=
 f the University of California. All rights reserved.<br>
 FreeBSD is a registered trademark of The FreeBSD Foundation.<br>FreeBSD 9.1=
 -RELEASE #0 r243825: Tue Dec=A0 4 09:23:10 UTC 2012<br>=A0=A0=A0 root at farre=
 ll.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64<br>CPU: Intel(R) Core=
 (TM)2 CPU=A0=A0=A0=A0=A0=A0=A0=A0=A0 6400=A0 @ 2.13GHz (2133.45-MHz K8-clas=
 s CPU)<br>
 =A0 Origin =3D "GenuineIntel"=A0 Id =3D 0x6f2=A0 Family =3D 6=A0 =
 Model =3D f=A0 Stepping =3D 2<br>=A0 Features=3D0xbfebfbff<FPU,VME,DE,PS=
 E,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI=
 ,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE><br>
 =A0 Features2=3D0xe3bd<SSE3,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,xTP=
 R,PDCM><br>=A0 AMD Features=3D0x20100800<SYSCALL,NX,LM><br>=A0 AMD=
  Features2=3D0x1<LAHF><br>=A0 TSC: P-state invariant, performance sta=
 tistics<br>
 real memory=A0 =3D 4296015872 (4097 MB)<br>avail memory =3D 4101558272 (391=
 1 MB)<br>Event timer "LAPIC" quality 400<br>ACPI APIC Table: <=
 COMPAQ GLENWOOD><br>FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs<=
 br>
 FreeBSD/SMP: 1 package(s) x 2 core(s)<br>=A0cpu0 (BSP): APIC ID:=A0 0<br>=
 =A0cpu1 (AP): APIC ID:=A0 1<br>ioapic0: Changing APIC ID to 1<br>ioapic0 &l=
 t;Version 2.0> irqs 0-23 on motherboard<br>kbd1 at kbdmux0<br>acpi0: &lt=
 ;HPQOEM SLIC-WKS> on motherboard<br>
 acpi0: Power Button (fixed)<br>acpi0: reservation of 0, a0000 (3) failed<br=
 >acpi0: reservation of 100000, dff00000 (3) failed<br>cpu0: <ACPI CPU&gt=
 ; on acpi0<br>cpu1: <ACPI CPU> on acpi0<br>attimer0: <AT timer>=
  port 0x40-0x43 irq 0 on acpi0<br>
 Timecounter "i8254" frequency 1193182 Hz quality 0<br>Event timer=
  "i8254" frequency 1193182 Hz quality 100<br>atrtc0: <AT realt=
 ime clock> port 0x70-0x71 irq 8 on acpi0<br>Event timer "RTC" =
 frequency 32768 Hz quality 0<br>
 hpet1: <High Precision Event Timer> iomem 0xfed00000-0xfed003ff on ac=
 pi0<br>Event timer "HPET" frequency 14318180 Hz quality 450<br>Ev=
 ent timer "HPET1" frequency 14318180 Hz quality 440<br>Event time=
 r "HPET2" frequency 14318180 Hz quality 440<br>
 hpet0: <High Precision Event Timer> iomem 0xfed00000-0xfed003ff on ac=
 pi0<br>device_attach: hpet0 attach returned 12<br>Timecounter "ACPI-fa=
 st" frequency 3579545 Hz quality 900<br>acpi_timer0: <24-bit timer =
 at 3.579545MHz> port 0xf808-0xf80b on acpi0<br>
 <br>Regards<br>Johan<br><br>
 
 --089e01177699f745b904d269bf93--


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