[Xen-bugs] [Bug 195] Many Timer ISR: Time went backwards logs

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=195


jamundso@xxxxxxxxx changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |NEW
          Component|Unspecified                 |2.6.18 dom0




------- Comment #44 from jamundso@xxxxxxxxx  2010-05-04 12:41 -------
I've seen this for forever on Dell PE2600 boxen running CentOS 5.x, and note
the hpet_force workaround seems completely ignored. Also, in my current
example, there are no domU's involved whatsoever - just the running dom0 is
enough...

[root@xenC ~]# xm dmesg|grep -E "Xen version|timer"
 Xen version 3.1.2-164.15.1.el5 (mockbuild@xxxxxxxxxx) (gcc version 4.1.2
20080704 (Red Hat 4.1.2-46)) Wed Mar 17 11:29:22 EDT 2010
(XEN) Platform timer overflows in 2 jiffies.
(XEN) Platform timer is 1.193MHz PIT

[root@xenC ~]# xm dmesg
 __  __            _____  _   ____     _  __   _  _    _ ____   _       _ ____  
 \ \/ /___ _ __   |___ / / | |___ \   / |/ /_ | || |  / | ___| / |  ___| | ___| 
  \  // _ \ \047_ \    |_ \ | |   __) |__| | \047_ \| || |_ | |___ \ | | / _ \
|___ \ 
  /  \  __/ | | |  ___) || |_ / __/|__| | (_) |__   _|| |___) || ||  __/ |___)
|
 /_/\_\___|_| |_| |____(_)_(_)_____|  |_|\___/   |_|(_)_|____(_)_(_)___|_|____/ 

 http://www.cl.cam.ac.uk/netos/xen
 University of Cambridge Computer Laboratory

 Xen version 3.1.2-164.15.1.el5 (mockbuild@xxxxxxxxxx) (gcc version 4.1.2
20080704 (Red Hat 4.1.2-46)) Wed Mar 17 11:29:22 EDT 2010
 Latest ChangeSet: unavailable

(XEN) Command line: dom0_mem=288M hpet_force=1
(XEN) Video information:
(XEN)  VGA is text mode 80x25, font 8x16
(XEN)  VBE/DDC methods: V2; EDID transfer time: 2 seconds
(XEN) Disc information:
(XEN)  Found 1 MBR signatures
(XEN)  Found 1 EDD information structures
(XEN) Xen-e820 RAM map:
(XEN)  0000000000000000 - 00000000000a0000 (usable)
(XEN)  0000000000100000 - 00000000f7fd0000 (usable)
(XEN)  00000000f7fd0000 - 00000000f7fdfc00 (ACPI data)
(XEN)  00000000f7fdfc00 - 00000000f7fff000 (reserved)
(XEN)  00000000fec00000 - 00000000fec90000 (reserved)
(XEN)  00000000fee00000 - 00000000fee10000 (reserved)
(XEN)  00000000ffb00000 - 0000000100000000 (reserved)
(XEN)  0000000100000000 - 0000000108000000 (usable)
(XEN) System RAM: 4095MB (4193728kB)
(XEN) Xen heap: 9MB (9980kB)
(XEN) Domain heap initialised: DMA width 32 bits
(XEN) PAE enabled, limit: 16 GB
(XEN) Processor #0 15:2 APIC version 20
(XEN) Processor #6 15:2 APIC version 20
(XEN) Processor #1 15:2 APIC version 20
(XEN) Processor #7 15:2 APIC version 20
(XEN) IOAPIC[0]: apic_id 8, version 32, address 0xfec00000, GSI 0-23
(XEN) IOAPIC[1]: apic_id 9, version 32, address 0xfec80000, GSI 24-47
(XEN) IOAPIC[2]: apic_id 10, version 32, address 0xfec81000, GSI 72-95
(XEN) IOAPIC[3]: apic_id 11, version 32, address 0xfec82000, GSI 120-143
(XEN) IOAPIC[4]: apic_id 12, version 32, address 0xfec82800, GSI 144-167
(XEN) Enabling APIC mode:  Flat.  Using 5 I/O APICs
(XEN) Using scheduler: SMP Credit Scheduler (credit)
(XEN) Detected 2791.826 MHz processor.
(XEN) I/O virtualisation disabled
(XEN) CPU0: Intel(R) Xeon(TM) CPU 2.80GHz stepping 07
(XEN) Booting processor 1/6 eip 90000
(XEN) CPU1: Intel(R) Xeon(TM) CPU 2.80GHz stepping 07
(XEN) Booting processor 2/1 eip 90000
(XEN) CPU2: Intel(R) Xeon(TM) CPU 2.80GHz stepping 07
(XEN) Booting processor 3/7 eip 90000
(XEN) CPU3: Intel(R) Xeon(TM) CPU 2.80GHz stepping 07
(XEN) Total of 4 processors activated.
(XEN) ENABLING IO-APIC IRQs
(XEN)  -> Using new ACK method
(XEN) Platform timer overflows in 2 jiffies.
(XEN) Platform timer is 1.193MHz PIT
(XEN) Brought up 4 CPUs
(XEN) *** LOADING DOMAIN 0 ***
(XEN) elf_parse_binary: phdr: paddr=0xc0400000 memsz=0x282708
(XEN) elf_parse_binary: phdr: paddr=0xc0683000 memsz=0x163000
(XEN) elf_parse_binary: memory: 0xc0400000 -> 0xc07e6000
(XEN) elf_xen_parse_note: GUEST_OS = "linux"
(XEN) elf_xen_parse_note: GUEST_VERSION = "2.6"
(XEN) elf_xen_parse_note: XEN_VERSION = "xen-3.0"
(XEN) elf_xen_parse_note: VIRT_BASE = 0xc0000000
(XEN) elf_xen_parse_note: PADDR_OFFSET = 0xc0000000
(XEN) elf_xen_parse_note: ENTRY = 0xc0400000
(XEN) elf_xen_parse_note: HYPERCALL_PAGE = 0xc0401000
(XEN) elf_xen_parse_note: FEATURES =
"writable_page_tables|writable_descriptor_tables|auto_translated_physmap|pae_pgdir_above_4gb|supervisor_mode_kernel"
(XEN) elf_xen_parse_note: PAE_MODE = "yes"
(XEN) elf_xen_parse_note: LOADER = "generic"
(XEN) elf_xen_addr_calc_check: addresses:
(XEN)     virt_base        = 0xc0000000
(XEN)     elf_paddr_offset = 0xc0000000
(XEN)     virt_offset      = 0x0
(XEN)     virt_kstart      = 0xc0400000
(XEN)     virt_kend        = 0xc07e6000
(XEN)     virt_entry       = 0xc0400000
(XEN)  Xen  kernel: 32-bit, PAE, lsb
(XEN)  Dom0 kernel: 32-bit, PAE, lsb, paddr 0xc0400000 -> 0xc07e6000
(XEN) PHYSICAL MEMORY ARRANGEMENT:
(XEN)  Dom0 alloc.:   000000003c000000->000000003e000000 (65536 pages to be
allocated)
(XEN) VIRTUAL MEMORY ARRANGEMENT:
(XEN)  Loaded kernel: c0400000->c07e6000
(XEN)  Init. ramdisk: c07e6000->c0f2c000
(XEN)  Phys-Mach map: c0f2c000->c0f74000
(XEN)  Start info:    c0f74000->c0f7446c
(XEN)  Page tables:   c0f75000->c0f84000
(XEN)  Boot stack:    c0f84000->c0f85000
(XEN)  TOTAL:         c0000000->c1400000
(XEN)  ENTRY ADDRESS: c0400000
(XEN) Dom0 has maximum 4 VCPUs
(XEN) elf_load_binary: phdr 0 at 0xc0400000 -> 0xc0682708
(XEN) elf_load_binary: phdr 1 at 0xc0683000 -> 0xc072dcc4
(XEN) Initrd len 0x746000, start at 0xc07e6000
(XEN) Scrubbing Free RAM: ......................................done.
(XEN) Xen trace buffers: disabled
(XEN) Std. Loglevel: Errors and warnings
(XEN) Guest Loglevel: Nothing (Rate-limited: Errors and warnings)
(XEN) Xen is relinquishing VGA console.
(XEN) *** Serial input -> DOM0 (type \047CTRL-a\047 three times to switch input
to Xen).
(XEN) Freed 108kB init memory.


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