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[Xen-devel] Problem correlating TSC read from domU with Xentrace's TSC
| To: | xen-devel@xxxxxxxxxxxxxxxxxxx |
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| Subject: | [Xen-devel] Problem correlating TSC read from domU with Xentrace's TSC |
| From: | Thawan Kooburat <kthawan@xxxxxxxxx> |
| Date: | Wed, 16 Nov 2011 15:07:53 -0600 |
| Delivery-date: | Wed, 16 Nov 2011 13:08:44 -0800 |
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Hi, I am trying to correlating performance issue in guest VM with the scheduling trace from Xentrace. User-mode application in guest VM periodically dump APIC ID and RDTSC into trace. I also start Xentrace in Dom0 during the same period. However, I notice that range of TSC values report both trace is completely disjointed. TSC values from Xentrace is always greater than what guest VM see, even if I start capturing Xen's trace 30s before capturing trace in guest VM. I understand that Xen don't emulate rdtsc() for PV guest and Xentrace also read rdtsc() during __insert_record(). However, I don't understand what cause my issue. Any suggestion? I am using Xen 4.1.1 on Fedora 15 -- Thawan Kooburat Graduate Student Department of Computer Science UW-Madison _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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