On 05/ 3/10 05:00 AM, Andre Boegelsack wrote:> 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. 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?
>
> Thanks
> André
>
You might be better off using the DTrace frontend to the xentrace data.
It's called xdt. The package name used to be SUNWxdt, it is now
system/kernel/dtrace/providers/xdt. Look in /usr/demo/xvm/dtrace for
examples and a README on how to use it. It's not a production interface,
but we used it for debugging, and it was very useful that way.
- Frank
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