linux-kernel - CE: xen increasing min_delta_ns to 7651397591976463850 nsec

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Message-ID: <20100222082657.GA26436@merkur.sol.de>
Date:	Mon, 22 Feb 2010 09:26:59 +0100
From:	Jens Seidel <jensseidel@...rs.sf.net>
To:	linux-kernel@...r.kernel.org
Subject: CE: xen increasing min_delta_ns to 7651397591976463850 nsec

Hi,

I'm using vanilla 2.6.32.7 domU kernel with Xen 3.2 and get very often a
unresponsible system after approximately one or two days with messages such as

[43616.674502] CE: xen increasing min_delta_ns to 16086592372704132408 nsec
[43616.674502] CE: xen increasing min_delta_ns to 5683144485346646996 nsec
[43616.674502] CE: xen increasing min_delta_ns to 17748088764874746302 nsec
[43616.674502] CE: xen increasing min_delta_ns to 17398761110457343644 nsec
[43616.674502] CE: xen increasing min_delta_ns to 7651397591976463850 nsec
[43616.674502] CE: xen increasing min_delta_ns to 2253724351109919966 nsec
[43616.674502] CE: xen increasing min_delta_ns to 3380586526664879948 nsec
[43616.674502] CE: xen increasing min_delta_ns to 5070879789997319922 nsec
[43616.674502] CE: xen increasing min_delta_ns to 7606319684995979882 nsec
[43616.674502] CE: xen increasing min_delta_ns to 11409479527493969822 nsec
[43616.674502] CE: xen increasing min_delta_ns to 17114219291240954732 nsec

on the console. I fail to login via ssh and even to cleanly shutdown this
system via xm <id> shutdown. sysrq requests still work.

I searched the net but found only messages with 15000 nsec. My values are a
little bit larger :-)) Found references to the kernel parameter notsc and
tried it but the problem remains.

The problem started once I upgraded the kernel from 2.6.26 to 2.6.32.7.
I changed from 32bit to 64bit but apart from this I did only a make oldconfig.
That's why I think it's not my config which causes trouble.

Any ideas? Is it a known problem?

PS: Please CC: me.

Jens
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