Re: [Xen-devel] #599161: Xen debug patch for the "clock shifts by 50 minutes" bug.

[Sylvain Munaut <s.munaut@xxxxxxxxxxxxxxxxxxxx>]

Hi,


I just wanted to say I've also been hitting this problem for years on
some servers.
That was originally under xen 4.0 when I originally installed the
machines, but even after update to 4.1.3 and more recently a 3.6.4
dom0 kernel, the problem is still present.

More specifically the two hw platforms I'm sure are concerned (hw +
cpu info + debug-key 's' info)

Sun Fire x2250:

    cpu family : 6
    model : 23
    model name : Intel(R) Xeon(R) CPU           L5420  @ 2.50GHz
    stepping : 6
    microcode : 0x60b

(XEN) TSC has constant rate, deep Cstates possible, so not reliable,
warp=3292 (count=1)
(XEN) dom1: mode=0,ofs=0x56eb699774,khz=2500128,inc=1,vtsc count:
1168090 kernel, 18678 user


Sun Fire x4150:

    cpu family : 6
    model : 23
    model name : Intel(R) Xeon(R) CPU           E5450  @ 3.00GHz
    stepping : 10
    microcode : 0xa07

(XEN) TSC has constant rate, deep Cstates possible, so not reliable,
warp=3789 (count=1)
(XEN) dom2: mode=0,ofs=0x3a652aed7d,khz=2992564,inc=1,vtsc count:
4247396065 kernel, 712543 user
(XEN) dom3: mode=0,ofs=0x9eb4c44593,khz=2500147,inc=2,vtsc count:
1967559486 kernel, 192516 user


When the problem appears, I can also see the "(XEN) Platform timer
appears to have unexpectedly wrapped 10 or more times." message.

I have now deployed a freshly compiled 4.1.3 with the latest tsc debug
patched compiled and loglvl=all option to a test server with the same
hw where the problem happenned and I'll report if I see anything.

The problem is pretty rare so not sure when it will happen next ...


Cheers,

     Sylvain

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