Error message using xentrace.

Error message using xentrace.

[Parisa Heidari]

Hello,

I'm taking a trace using Xentrace. Everything seems to be ok and I 'm able to
take the trace. Then, seeing the result by xentrace_format, I receive this
error message:
$xentrace_format  /etc/xen/formats < ~/Traces/xentrace.dat > ~/Traces/def1
Traceback (most recent call last):
  File "./xentrace_format", line 108, in ?
    (tsc, event, d1, d2, d3, d4, d5) = struct.unpack(TRCREC, line)
struct.error: unpack str size does not match format


However it gives me a file. And the output is like:
CPU0  1637436031845 (+       0)  do_block               [ domid = 0x00000000,
edomid = 0x00000000 ]
CPU0  1637436034822 (+    2977)  unknown (0x000000000002f00e)  [ 0x00000000
0x0002f2aa 0x00000000 0x00000000 0x00000000 ]
CPU0  1637436035370 (+     548)  unknown (0x000000000002f00f)  [ 0x00007fff
0x0002f2aa 0x01c9c380 0x00000000 0x00000000 ]

......

Am I doing something wrong? What is the problem with the unknown events?

Thanks in advance,
Parissa.

Re: Error message using xentrace.

[INAKOSHI Hiroya]

Parisa,

did you execute xentrace_format on a heterogeneous machine?

Regards,
Hiroya

Parisa Heidari wrote:
> 
> Hello,
> 
> I'm taking a trace using Xentrace. Everything seems to be ok and I 'm able to
> take the trace. Then, seeing the result by xentrace_format, I receive this
> error message:
> $xentrace_format  /etc/xen/formats < ~/Traces/xentrace.dat > ~/Traces/def1
> Traceback (most recent call last):
>   File "./xentrace_format", line 108, in ?
>     (tsc, event, d1, d2, d3, d4, d5) = struct.unpack(TRCREC, line)
> struct.error: unpack str size does not match format
> 
> 
> However it gives me a file. And the output is like:
> CPU0  1637436031845 (+       0)  do_block               [ domid = 0x00000000,
> edomid = 0x00000000 ]
> CPU0  1637436034822 (+    2977)  unknown (0x000000000002f00e)  [ 0x00000000
> 0x0002f2aa 0x00000000 0x00000000 0x00000000 ]
> CPU0  1637436035370 (+     548)  unknown (0x000000000002f00f)  [ 0x00007fff
> 0x0002f2aa 0x01c9c380 0x00000000 0x00000000 ]
> 
> ......
> 
> Am I doing something wrong? What is the problem with the unknown events?
> 
> Thanks in advance,
> Parissa.
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
> 

Re: Error message using xentrace.

[Parissa Heidari]

Hi Hiroya,
No, I execute xentrace_forma on the same machine that I'm taking the trace; 
both of them are being executes on i386.

Regards,
Parissa.

On Monday 16 April 2007 04:31, you wrote:
> Parisa,
>
> did you execute xentrace_format on a heterogeneous machine?
>
> Regards,
> Hiroya
>
> Parisa Heidari wrote:
> > Hello,
> >
> > I'm taking a trace using Xentrace. Everything seems to be ok and I 'm
> > able to take the trace. Then, seeing the result by xentrace_format, I
> > receive this error message:
> > $xentrace_format  /etc/xen/formats < ~/Traces/xentrace.dat >
> > ~/Traces/def1 Traceback (most recent call last):
> >   File "./xentrace_format", line 108, in ?
> >     (tsc, event, d1, d2, d3, d4, d5) = struct.unpack(TRCREC, line)
> > struct.error: unpack str size does not match format
> >
> >
> > However it gives me a file. And the output is like:
> > CPU0  1637436031845 (+       0)  do_block               [ domid =
> > 0x00000000, edomid = 0x00000000 ]
> > CPU0  1637436034822 (+    2977)  unknown (0x000000000002f00e)  [
> > 0x00000000 0x0002f2aa 0x00000000 0x00000000 0x00000000 ]
> > CPU0  1637436035370 (+     548)  unknown (0x000000000002f00f)  [
> > 0x00007fff 0x0002f2aa 0x01c9c380 0x00000000 0x00000000 ]
> >
> > ......
> >
> > Am I doing something wrong? What is the problem with the unknown events?
> >
> > Thanks in advance,
> > Parissa.
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@lists.xensource.com
> > http://lists.xensource.com/xen-devel

Re: Error message using xentrace.

[Mark Williamson]

Hi there,

Are you using a customised formats file?

Could you possibly make the trace file and the formats file you're using 
available online somewhere.  I might be able t otake a look at it.

Cheers,
Mark

On Monday 16 April 2007, Parissa Heidari wrote:
> Hi Hiroya,
> No, I execute xentrace_forma on the same machine that I'm taking the trace;
> both of them are being executes on i386.
>
> Regards,
> Parissa.
>
> On Monday 16 April 2007 04:31, you wrote:
> > Parisa,
> >
> > did you execute xentrace_format on a heterogeneous machine?
> >
> > Regards,
> > Hiroya
> >
> > Parisa Heidari wrote:
> > > Hello,
> > >
> > > I'm taking a trace using Xentrace. Everything seems to be ok and I 'm
> > > able to take the trace. Then, seeing the result by xentrace_format, I
> > > receive this error message:
> > > $xentrace_format  /etc/xen/formats < ~/Traces/xentrace.dat >
> > > ~/Traces/def1 Traceback (most recent call last):
> > >   File "./xentrace_format", line 108, in ?
> > >     (tsc, event, d1, d2, d3, d4, d5) = struct.unpack(TRCREC, line)
> > > struct.error: unpack str size does not match format
> > >
> > >
> > > However it gives me a file. And the output is like:
> > > CPU0  1637436031845 (+       0)  do_block               [ domid =
> > > 0x00000000, edomid = 0x00000000 ]
> > > CPU0  1637436034822 (+    2977)  unknown (0x000000000002f00e)  [
> > > 0x00000000 0x0002f2aa 0x00000000 0x00000000 0x00000000 ]
> > > CPU0  1637436035370 (+     548)  unknown (0x000000000002f00f)  [
> > > 0x00007fff 0x0002f2aa 0x01c9c380 0x00000000 0x00000000 ]
> > >
> > > ......
> > >
> > > Am I doing something wrong? What is the problem with the unknown
> > > events?
> > >
> > > Thanks in advance,
> > > Parissa.
> > >
> > > _______________________________________________
> > > Xen-devel mailing list
> > > Xen-devel@lists.xensource.com
> > > http://lists.xensource.com/xen-devel
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel



-- 
Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!

Re: Error message using xentrace.

[Parissa Heidari]

Hi Mark,
You could find the files (formats & xentrace.dat) here:
http://ltt.polymtl.ca/~parisa

Formas is not customised. As I have written in the "text" file, I'm using 
xen-unstable and the "formats" found in :
xen-unstable.hg/tools/xentrace/formats

I really appreciate your help,
Parissa.

On Tuesday 24 April 2007 12:36, you wrote:
> Hi there,
>
> Are you using a customised formats file?
>
> Could you possibly make the trace file and the formats file you're using
> available online somewhere.  I might be able t otake a look at it.
>
> Cheers,
> Mark
>
> On Monday 16 April 2007, Parissa Heidari wrote:
> > Hi Hiroya,
> > No, I execute xentrace_forma on the same machine that I'm taking the
> > trace; both of them are being executes on i386.
> >
> > Regards,
> > Parissa.
> >
> > On Monday 16 April 2007 04:31, you wrote:
> > > Parisa,
> > >
> > > did you execute xentrace_format on a heterogeneous machine?
> > >
> > > Regards,
> > > Hiroya
> > >
> > > Parisa Heidari wrote:
> > > > Hello,
> > > >
> > > > I'm taking a trace using Xentrace. Everything seems to be ok and I 'm
> > > > able to take the trace. Then, seeing the result by xentrace_format, I
> > > > receive this error message:
> > > > $xentrace_format  /etc/xen/formats < ~/Traces/xentrace.dat >
> > > > ~/Traces/def1 Traceback (most recent call last):
> > > >   File "./xentrace_format", line 108, in ?
> > > >     (tsc, event, d1, d2, d3, d4, d5) = struct.unpack(TRCREC, line)
> > > > struct.error: unpack str size does not match format
> > > >
> > > >
> > > > However it gives me a file. And the output is like:
> > > > CPU0  1637436031845 (+       0)  do_block               [ domid =
> > > > 0x00000000, edomid = 0x00000000 ]
> > > > CPU0  1637436034822 (+    2977)  unknown (0x000000000002f00e)  [
> > > > 0x00000000 0x0002f2aa 0x00000000 0x00000000 0x00000000 ]
> > > > CPU0  1637436035370 (+     548)  unknown (0x000000000002f00f)  [
> > > > 0x00007fff 0x0002f2aa 0x01c9c380 0x00000000 0x00000000 ]
> > > >
> > > > ......
> > > >
> > > > Am I doing something wrong? What is the problem with the unknown
> > > > events?
> > > >
> > > > Thanks in advance,
> > > > Parissa.
> > > >
> > > > _______________________________________________
> > > > Xen-devel mailing list
> > > > Xen-devel@lists.xensource.com
> > > > http://lists.xensource.com/xen-devel
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@lists.xensource.com
> > http://lists.xensource.com/xen-devel

Re: Error message using xentrace.

[Thomas Friebel]

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On Sun, 2007-04-15 at 14:47 -0400, Parisa Heidari wrote:
> $xentrace_format  /etc/xen/formats < ~/Traces/xentrace.dat > ~/Traces/def1
> Traceback (most recent call last):
>   File "./xentrace_format", line 108, in ?
>     (tsc, event, d1, d2, d3, d4, d5) = struct.unpack(TRCREC, line)
> struct.error: unpack str size does not match format

This happens from time to time. I think the reason is that xentrace
writes the trace records in two steps: first the CPU number and second
the rest of the trace record. When you interrupt (CTRL-C) xentrace
between these two writes then the last trace entry in the file is
incomplete.

If you need to work around this you might want to pause the VM before
stopping xentrace, so you don't interrupt it at work. But I think it is
save to ignore the error.


> However it gives me a file. And the output is like:
> CPU0  1637436031845 (+       0)  do_block               [ domid = 0x00000000,
> edomid = 0x00000000 ]
> CPU0  1637436034822 (+    2977)  unknown (0x000000000002f00e)  [ 0x00000000
> 0x0002f2aa 0x00000000 0x00000000 0x00000000 ]
> CPU0  1637436035370 (+     548)  unknown (0x000000000002f00f)  [ 0x00007fff
> 0x0002f2aa 0x01c9c380 0x00000000 0x00000000 ]

These two event IDs (0x2f00e and 0x2f00f) are defined and used in the
code since changeset 7801. But there has not been a description added to
the formats file yet.

Cheers
  Thomas


-- 
Thomas Friebel
Operating System Research Center
AMD Saxony, Dresden, Germany
--
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