Re: [Xen-devel] Question regarding xentrace

[Dulloor <dulloor@xxxxxxxxx>]

Are you using xentrace_format, xentrace, and xen all from the same
version ? I don't think the trace-ids are incompatible across
versions, but still.
Also, what HVM events are you seeing ?

-dulloor

On Mon, May 17, 2010 at 11:58 PM, André Bögelsack
<Andre.Boegelsack@xxxxxxxxx> 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 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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>

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