From: Joanna Rutkowska <joanna@invisiblethingslab.com>
To: Dan Magenheimer <dan.magenheimer@oracle.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>, xen-devel@lists.xensource.com
Subject: Re: A clocksource question
Date: Thu, 11 Mar 2010 01:15:20 +0100 [thread overview]
Message-ID: <4B983618.9030004@invisiblethingslab.com> (raw)
In-Reply-To: <56cc3abf-21f6-4178-b00e-0331538080d9@default>
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On 03/11/2010 01:07 AM, Dan Magenheimer wrote:
>> Clocksource tsc unstable (delta = 62752834 ns)
>> hrtimer: interrupt too slow, forcing clock min delta to 412700358 ns
>>
>>> I don't remember if 3.4.2 ended up with tsc emulation, but if it does
>>> you might try enabling it.
>>>
>>
>> TSC emulation? But I'm running only PV guests. Not sure what do you
>> mean
>> by this, or how to enable it?
>
> I don't think there is any TSC emulation (or more properly "rdtsc emulation")
> in 3.4.x, certainly not without a special Xen boot option.
>
> The TSC delta is troubling...
Actually I'm getting this also when booting Dom0 (pvops 2.6.31.6-based)
with clocksource=jifffies:
Clocksource tsc unstable (delta = 62528016 ns)
But, there are not visible problems like kbd hiccup or process
scheduling in VM (besides wallclock drift in Dom0 which is annoying).
> if you hadn't said you had turned
> off all power management, I would have guessed a problem with
> C-state management. Maybe Xen is discovering some power management
> capability not visible in BIOS settings?
>
I'm not very much of an ACPI expert, so if there are any output I can
send, just let me know.
j.
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next prev parent reply other threads:[~2010-03-11 0:15 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-09 10:47 A clocksource question Joanna Rutkowska
2010-03-09 10:50 ` Keir Fraser
2010-03-09 10:54 ` Joanna Rutkowska
2010-03-09 11:06 ` Joanna Rutkowska
2010-03-09 12:07 ` Pasi Kärkkäinen
2010-03-09 12:10 ` Joanna Rutkowska
2010-03-09 15:42 ` Konrad Rzeszutek Wilk
2010-03-09 23:36 ` Jeremy Fitzhardinge
2010-03-10 22:13 ` Joanna Rutkowska
2010-03-11 0:07 ` Dan Magenheimer
2010-03-11 0:15 ` Joanna Rutkowska [this message]
2010-03-11 0:21 ` Ian Pratt
2010-03-11 0:44 ` Dan Magenheimer
2010-03-12 0:34 ` Joanna Rutkowska
2010-03-11 0:52 ` Joanna Rutkowska
2010-03-11 1:06 ` Jeremy Fitzhardinge
2010-03-11 1:19 ` Joanna Rutkowska
2010-03-11 4:55 ` Jeremy Fitzhardinge
2010-03-11 10:49 ` Joanna Rutkowska
2010-03-12 0:27 ` Joanna Rutkowska
2010-03-12 0:49 ` Jeremy Fitzhardinge
2010-03-12 0:38 ` Joanna Rutkowska
2010-03-12 19:02 ` Joanna Rutkowska
2010-03-12 21:24 ` Jeremy Fitzhardinge
2010-03-12 21:56 ` Tobias Geiger
2010-03-12 22:02 ` Jeremy Fitzhardinge
2010-03-12 21:01 ` Joanna Rutkowska
2010-03-12 21:13 ` Joanna Rutkowska
2010-03-12 23:48 ` Jeremy Fitzhardinge
2010-03-13 9:58 ` Joanna Rutkowska
2010-03-13 19:30 ` Jeremy Fitzhardinge
2010-03-15 6:49 ` Tobias Geiger
2010-03-16 6:01 ` Joanna Rutkowska
2010-03-17 13:35 ` Tobias Geiger
2010-03-17 15:21 ` Joanna Rutkowska
2010-03-17 16:20 ` Jeremy Fitzhardinge
2010-03-17 17:05 ` Joanna Rutkowska
2010-03-17 17:21 ` Jeremy Fitzhardinge
2010-03-17 16:26 ` Dan Magenheimer
2010-03-12 22:56 ` Tobias Geiger
2010-03-11 7:47 ` Keir Fraser
-- strict thread matches above, loose matches on Subject: below --
2010-03-12 11:42 Tobias Geiger
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