[Xen-devel] Question regarding xentrace

[André Bögelsack <Andre.Boegelsack@xxxxxxxxx>]

Hi,

I've made some SAP benchmarks on my Xen system and discovered a huge difference
in the performance of a "xened" SAP system compared to a native
SAP system. Hence, I tried to figure out what might cause this 'overhead'
and run a xentrace (listining to all events). Xentrace produced 24gb data
and I converted it to 27gb human-readable data by using xentrace_format.
After I gathered the human-readable data, I filtered the data and counted
the appearance of each event. So far, so good.

Now it comes: although I used paravirt-guests, the xentrace-tool reported
HVM events in the trace data. Moreover, from my point of view it is impossible
to trace HVM events, as I use AMD Opteron 280 with no AMD-V feature.

Did I miss something or does the xentrace-tool report 'wrong' trace data?

I use Xen version 3.2.0_16718_14-0.4 (from Suse).

Thanks
André
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