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Old 02-20-2012, 07:52 AM
Dimitrij Hilt
Default Bug#599161: Got a same isuse with Dell R900.


we got exactly same issue with two Dell PowerEdge R900. After running
without any trouble for 50 resp. 60 days, Dom0 does jump several hours
in a future.

Dom0 mean in "xm debug-key s; xm dmesg"
(XEN) Platform timer appears to have unexpectedly wrapped 10 or more times.
(XEN) TSC has constant rate, deep Cstates possible, so not reliable,
warp=15048 (count=1)
(XEN) dom1: mode=0,ofs=0x175a91cd54,khz=2925946,inc=1,vtsc count:
164505657108 kernel, 22209746 user
(XEN) dom3: mode=0,ofs=0xb0d3e99f1f81,khz=2925946,inc=1,vtsc count:
30339779336 kernel, 19604648 user
(XEN) dom4: mode=0,ofs=0xdc739842b4f4,khz=2925946,inc=1,vtsc count:
5903404261 kernel, 29402760 user
(XEN) dom12: mode=0,ofs=0x12f1b269dbff1d,khz=2925946,inc=1,vtsc count:
6914273 kernel, 78450 user

DomU on same Host:
kernel: : [5100661.449288] Clocksource tsc unstable (delta =
-807453857134 ns)

We running hypervisor with boot line "/boot/xen-4.0-amd64.gz placeholder
clocksource=pit cpuidle=0 dom0_mem=512M loglvl=all guest_loglvl=all"

As CPU we have 4x "X7350 @ 2.93GHz"

Any ideas how we can fix or avoid these jumps? Ist it an option to
ignore Clock jumps in Dom0 in DomU (xen.independent_wallclock=1 was in
Xen3 an Option).

We have no problem if Dom0 jumps, but for DomU it is catastrophically.



Dimitrij Hilt


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