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

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

           Summary: Many Timer ISR: Time went backwards logs
           Product: Xen
           Version: 2.0
          Platform: x86
        OS/Version: Linux-2.6
            Status: NEW
          Severity: major
          Priority: P2
         Component: Guest-OS
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: alexander@xxxxxxxxxxxxx


Hello,
afer months of using stabe 2.0.6 and 2.0.7 i changed the CPU from Athlon 64 to a
Athlon 62 x2 dual core. 
Works fine and fast but the syslog on the UDomains logs many entries like:

Aug 28 20:03:23 music kernel: Timer ISR: Time went backwards: -2129859000
169370000000 141000 171500000000
Aug 28 20:03:23 music kernel: Timer ISR: Time went backwards: -2106071000
169390000000 3929000 171500000000
Aug 28 20:03:23 music kernel: Timer ISR: Time went backwards: -2087345000
169410000000 2655000 171500000000
Aug 28 20:03:23 music kernel: Timer ISR: Time went backwards: -2079980000
169420000000 20000 171500000000
Aug 28 20:03:23 music kernel: Timer ISR: Time went backwards: -2049817000
169450000000 183000 171500000000
Aug 28 20:03:23 music kernel: Timer ISR: Time went backwards: -2005001000
169490000000 4999000 171500000000
Aug 28 20:03:23 music kernel: Timer ISR: Time went backwards: -1994341000
169500000000 5659000 171500000000
Aug 28 20:03:23 music kernel: Timer ISR: Time went backwards: -1983325000
169510000000 6675000 171500000000
Aug 28 20:03:23 music kernel: Timer ISR: Time went backwards: -1970842000
169520000000 9158000 171500000000
Aug 28 20:03:23 music kernel: Timer ISR: Time went backwards: -1969970000
169530000000 30000 171500000000
Aug 28 20:03:23 music kernel: Timer ISR: Time went backwards: -1946520000
169550000000 3481000 171500000000
Aug 28 20:03:23 music kernel: Timer ISR: Time went backwards: -1929923000
169570000000 77000 171500000000
Aug 28 20:03:23 music kernel: Timer ISR: Time went backwards: -1912453000
169580000000 7547000 171500000000
Aug 28 20:03:23 music kernel: Timer ISR: Time went backwards: -1909926000
169590000000 74000 171500000000
Aug 28 20:03:23 music kernel: Timer ISR: Time went backwards: -1887345000
169610000000 2655000 171500000000
Aug 28 20:03:23 music kernel: Timer ISR: Time went backwards: -1863340000
169630000000 6660000 171500000000
Aug 28 20:03:23 music kernel: Timer ISR: Time went backwards: -1859734000
169640000000 266000 171500000000
Aug 28 20:03:23 music kernel: Timer ISR: Time went backwards: -1848726000
169650000000 1274000 171500000000
Aug 28 20:03:23 music kernel: Timer ISR: Time went backwards: -1827531000
169670000000 2469000 171500000000
...

I am afraid of overloading the UDomais with thousands of these entries.

Using a plain 2.0.7 from src on a Asus A8V with APIC enabled + disabled in BIOS
with no change. Changing Preemptible Kernel to yes/no with no change.
APM + Cool & Quiet are disabled.

Please help.
Alle further questions will bw answered.
Thanks.

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