Re: DTrace on Xen?

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Sat, Apr 09, 2016 at 01:50:44AM +0000, Christos Zoulas wrote:
> In article <20160409012248.GA27939%panix.com@localhost>,
> Thor Lancelot Simon  <tls%panix.com@localhost> wrote:
> >Next try: is DTrace (particularly FBT) expected to work on NetBSD/xen?
> >
> >I'm struggling to get some grasp on why I/O to SCSI disks uses *25X* more
> >CPU in "interrupt" time on the same system under NetBSD/xen than under
> >NetBSD/amd64.  Kernel profiling clearly does not work, so I'm hoping to
> >get somewhere with DTrace even if I have to do much of what gprof would
> >do for me by hand.
> >
> >This is -- among other things -- crippling the Foundation's pkgsrc build
> >server.  So I could use some help, if anyone's got it to give.
> 
> Why doesn't kernel profiling work.?

It panics (and the panic is not in the NetBSD kernel but in Xen, which makes
things harder to debug)

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--