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Re: Systemtap performance impact on N800
- From: fche at redhat dot com (Frank Ch. Eigler)
- To: "Bruno Abinader" <bruno dot abinader at openbossa dot org>
- Cc: systemtap at sources dot redhat dot com
- Date: Tue, 13 May 2008 09:56:37 -0400
- Subject: Re: Systemtap performance impact on N800
- References: <702ccd1e0805130634i35e9872bi2bd40d45a5d88bea@mail.gmail.com>
"Bruno Abinader" <bruno.abinader@openbossa.org> writes:
> We at INdT created a document called "Systemtap performance impact on
> N800", with performance comparisons between Kprobes, Systemtap and
> Oprofile usage. Feel free to read and ask us questions about our
> results!
Thanks for running these tests. One important thing to watch out for
is that you're comparing apples to apples.
For example, the stap_gettimeofday.stp file in section 2.2.3 asks to
probe both function entry and return, whereas the kprobe code listed
only probes function entry. For another, the stap_tapsets.stp test in
section 3.2 asks to trace some data for every probe hit, but I see no
corresponding kprobe source to confirm that equivalent output is being
generated there.
- FChE