> On Sep 17, 2019, at 11:21 AM, Damjan Marion via Lists.Fd.Io > <[email protected]> wrote: > > > >> On 17 Sep 2019, at 17:12, Christian Hopps <[email protected]> wrote: >> >> >> >>> On Sep 17, 2019, at 3:56 AM, Benoit Ganne (bganne) via Lists.Fd.Io >>> <[email protected]> wrote: >>> >>>>> AFAIK the default for x86_64 is to omit frame pointer >>>>> for optimized builds so you probably do not have it in most cases in VPP >>>>> builds (but I did not check). >>>>> So when perf tries to interpret random data as frame pointer, this is >>>>> what you get :) >>>>> The most reliable (but slowest) should be dwarf. lbr should be the way >>>>> to go on Intel Haswell and later. >>>> FWIW, this is being run on the Macchiatobin platform (i.e., aarch64 >>>> cortex-A72). :) >>> >>> My bad. Not sure what is going-on but it looks like gcc also omit fp by >>> default on aarch64: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84521 >>> Did you had a chance to try dwarf instead of fp? >> >> It doesn't appear to be an option in my perf binary, unfortunately. > > Wasn't much simpler to run "perf top" on the specific core and see where > cycles are spent?
This thread sort of forked I think. I was able to run "perf top" as well as "perf record" and get some results (indeed including specify a specific core). Additionally, I had some doubts about the results at the start of the thread b/c of the unexpected symbols that were present in the graph. Benoit has been making some suggestions on that (I think! :) front. IOW I think I'm all good on the perf as far as it goes. I still think it might be useful to have gprof work, especially if it just needs a little tweak somewhere to get working. :) Thanks, Chris. > > -=-=-=-=-=-=-=-=-=-=-=- > Links: You receive all messages sent to this group. > > View/Reply Online (#14006): https://lists.fd.io/g/vpp-dev/message/14006 > Mute This Topic: https://lists.fd.io/mt/34128898/1826170 > Group Owner: [email protected] > Unsubscribe: https://lists.fd.io/g/vpp-dev/unsub [[email protected]] > -=-=-=-=-=-=-=-=-=-=-=-
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