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Re: Re: [Xen-devel] Question regarding xentrace
- To: André Bögelsack <Andre.Boegelsack@xxxxxxxxx>
- From: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
- Date: Mon, 7 Jun 2010 15:29:23 +0100
- Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, Dulloor <dulloor@xxxxxxxxx>
- Delivery-date: Mon, 07 Jun 2010 07:30:15 -0700
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Hmm, that would be rather exceptional... the trace_id's haven't really changed since tracing was introduced, only new ones added. Are you sure you're using the xentrace_format that matches up to the 3.2 hypervisor you're using (and not, say, something from -unstable)? The format changed from fixed-length records to variable-length records somewhere around there (can't remember exactly).
If you take a really short trace (i.e., just let it run for 5 seconds before interrupting), I can try to take a quick look at it, to see what I see.
-George
On Mon, Jun 7, 2010 at 2:50 PM, André Bögelsack <Andre.Boegelsack@xxxxxxxxx> wrote:
I didn't change anything so I assume it
is the same version across the tools.
These are the events I gathered from
xentrace:
![]()
It is not possible to call a HVM event
on that hardware platform - the CPU is too old.
My guess is, that the trace_id's recorded
by xentrace and interpreted by xentrace_format are not identical. Is there
any way to prove it?
Regards
André
Dulloor <dulloor@xxxxxxxxx> schrieb am 03.06.2010
22:02:02:
> Von: Dulloor <dulloor@xxxxxxxxx>
> An: André Bögelsack <Andre.Boegelsack@xxxxxxxxx>
> Kopie: xen-devel@xxxxxxxxxxxxxxxxxxx
> Datum: 03.06.2010 22:02
> Betreff: Re: [Xen-devel] Question regarding xentrace
>
> 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
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel
> >
> >
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