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[Xen-devel] Weird NOW() values after host S3 resume

from [Guy Zana] [Permanent Link][Original]
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Subject: [Xen-devel] Weird NOW() values after host S3 resume
From: "Guy Zana" <guy@xxxxxxxxxxxx>
Date: Wed, 21 May 2008 12:09:00 -0400
Cc: "Tian, Kevin" <kevin.tian@xxxxxxxxx>, Xu Dongxiao <dongxiao.xu@xxxxxxxxx>
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Thread-topic: Weird NOW() values after host S3 resume

Hi all,

 

It seems that something is messed up with the calibration of the TSCs after resuming from sleep.

 

First, after resume NOW() issued from CPU0 gives a value that is much lower than before sleep, and it is probably returned to the same (default?) value after each resume.

Second, after each resume there is an increased differences between CPU0 and CPU1 NOW() values, I'm not really sure about this one because I didn't tried to sync my test against the HPET so take that into consideration.

 

Can you check this out please?

 

The chipset is Intel GM965/ICH8, the cpu is T7300.

Observed in Xen 3.2 stable release.

 

Thanks,

Guy.

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