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[Xen-devel] Timer ISR/0: Time went backwards

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Subject: [Xen-devel] Timer ISR/0: Time went backwards
From: Michal Ludvig <michal@xxxxxxxx>
Date: Sun, 06 Aug 2006 23:52:36 +1200
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I'm running latest Xen from 3.0 HG repository (changeset 9762) on a laptop with VIA C7 CPU (i.e. x86 arch). Apart from the kernel the rest of the system is Kubuntu 6.06.

With Xen kernel I observe all different kinds of problems, all could be timer related. E.g. sometimes a pressed key on a keyboard is read multiple times, for example when I want to write "password" I may end up with "paaassword". Or from time to time in KDE either mouse or a keybord suddenly stops responding and I need to switch windows to make it running again (strange enough Alt-Tab always worked so far even when no other keys seemed to be accepted).

In dmesg I see suspicious messages like this:

Timer ISR/0: Time went backwards: delta=-58905320 delta_cpu=-54905320 shadow=123279593111 off=13519708 processed=123352017015 cpu_processed=123348017015
 0: 123348017015
Timer ISR/0: Time went backwards: delta=-49996903 delta_cpu=-45996903 shadow=123279593111 off=22427259 processed=123352017015 cpu_processed=123348017015
 0: 123348017015
psmouse.c: TouchPad at isa0060/serio4/input0 lost synchronization, throwing 2 bytes away. psmouse.c: TouchPad at isa0060/serio4/input0 lost synchronization, throwing 3 bytes away.
psmouse.c: resync failed, issuing reconnect request
psmouse.c: TouchPad at isa0060/serio4/input0 lost synchronization, throwing 5 bytes away.

I tried recompiling the kernel with different timer and HZ settings, with and without REGPARM, but no luck so far.

Needless to say none of these problems exist when running original Ubuntu or vanilla non-Xen kernel (otherwise I wouldn't complain here ;-)

Any idea what can be wrong? I'm keen to run any tests or give you any other information you may need.



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