kern/166549: [eventttimers] Clock stops ticking in some cases with new timer framework in 9

[Alexander Churanov]

The following reply was made to PR kern/166549; it has been noted by GNATS.

From: "Alexander Churanov" <freebsd at alexanderchuranov.com>
To: bug-followup at freebsd.org, lists at rewt.org.uk
Cc:  
Subject: Re: kern/166549: [eventttimers] Clock stops ticking in some cases
 with new timer framework in 9
Date: Fri, 27 Apr 2012 13:45:28 +0400

 I also observe the same problem and decided to submit more data.
 
 Output of 'uname -a':
 FreeBSD vps-1 9.0-RELEASE FreeBSD 9.0-RELEASE #0: Tue Jan  3 07:15:25 UTC  
 2012     root at obrian.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  i386
 
 'svn up' and 'ssh somebody at localhost' hang. According to ktrace it's on  
 select() call.
 
 Output of 'sysctl kern.timecounter'
 
 kern.timecounter.tick: 1
 kern.timecounter.choice: TSC(-100) i8254(0) dummy(-1000000)
 kern.timecounter.hardware: i8254
 kern.timecounter.stepwarnings: 0
 kern.timecounter.tc.i8254.mask: 65535
 kern.timecounter.tc.i8254.counter: 15162
 kern.timecounter.tc.i8254.frequency: 1193182
 kern.timecounter.tc.i8254.quality: 0
 kern.timecounter.tc.TSC.mask: 4294967295
 kern.timecounter.tc.TSC.counter: 1850043174
 kern.timecounter.tc.TSC.frequency: 2261052965
 kern.timecounter.tc.TSC.quality: -100
 kern.timecounter.smp_tsc: 0
 kern.timecounter.invariant_tsc: 0
 
 Output of 'sysctl kern.eventtimer':
 
 kern.eventtimer.choice: LAPIC(400) i8254(100) RTC(0)
 kern.eventtimer.et.LAPIC.flags: 15
 kern.eventtimer.et.LAPIC.frequency: 50001127
 kern.eventtimer.et.LAPIC.quality: 400
 kern.eventtimer.et.RTC.flags: 17
 kern.eventtimer.et.RTC.frequency: 32768
 kern.eventtimer.et.RTC.quality: 0
 kern.eventtimer.et.i8254.flags: 1
 kern.eventtimer.et.i8254.frequency: 1193182
 kern.eventtimer.et.i8254.quality: 100
 kern.eventtimer.periodic: 0
 kern.eventtimer.timer: LAPIC
 kern.eventtimer.idletick: 0
 kern.eventtimer.singlemul: 4
 
 Output of 'vmstat -i':
 
 interrupt                          total       rate
 irq5: re0 uhci0                  3066560         66
 irq10: re1                            80          0
 irq14: ata0                       482243         10
 cpu0:timer                       5509435        119
 cpu1:timer                        862559         18
 Total                            9920877        215
 
 sysctl kern.eventtimer.periodic=1 starts the clock!
 
 A part of dmesg that seems relevant:
 
 ACPI Error: A valid RSDP was not found (20110527/tbxfroot-237)
 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 9.0-RELEASE #0: Tue Jan  3 07:15:25 UTC 2012
      root at obrian.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC i386
 ACPI Error: A valid RSDP was not found (20110527/tbxfroot-237)
 CPU: Intel(R) Xeon(R) CPU           E5520  @ 2.27GHz (2261.05-MHz  
 686-class CPU)
    Origin = "GenuineIntel"  Id = 0x106a5  Family = 6  Model = 1a  Stepping  
 = 5
    Features=0x1781fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,MMX
 ,FXSR,SSE,SSE2,HTT>
    Features2=0x80982201<SSE3,SSSE3,CX16,SSE4.1,SSE4.2,POPCNT,HV>
    AMD Features=0x20100000<NX,LM>
    AMD Features2=0x1<LAHF>
 real memory  = 536870912 (512 MB)
 avail memory = 506146816 (482 MB)
 MPTable: <_HVMCPU_ XEN         >
 Event timer "LAPIC" quality 400
 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:  2
 ioapic0: Changing APIC ID to 1
 ioapic0: Assuming intbase of 0
 ioapic0 <Version 1.1> irqs 0-47 on motherboard
 kbd1 at kbdmux0
 ACPI Error: A valid RSDP was not found (20110527/tbxfroot-237)
 ACPI: Table initialisation failed: AE_NOT_FOUND
 ACPI: Try disabling either ACPI or apic support.
 
 I hope this will help to resolve the issue.
 
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