never use any of the following software before....just suggest based on reading online:
cyclictest: read this: http://www.spinics.net/lists/linux-rt-users/msg04088.html (as explained within, "timer interrupt latency" is what is being measured by cyclictest.....not sure how it is done). More on cyclictest: http://elinux.org/images/0/01/Elc2013_rowand.pdf http://people.redhat.com/williams/latency-howto/rt-latency-howto.txt (last section on different ways of using cyclictest for interrupt latency is covered.) another: https://github.com/atlas555/rt-test (interrupt_tool) another is "intrperf" which originate from FreeBSD but there is a Linux version. google for it ( https://repos.dcl.info.waseda.ac.jp/spumone/trac/wiki/Interrupt%20Latency%20of%20Linux%20(intrperf)???). As highlighted here: http://marc.info/?l=linux-smp&m=102733872816465 interrupt latencies is really in such smaller order magnitude-wise, or due to low-level CPU feature like I-cache http://marc.info/?l=linux-arm-kernel&m=107472646713656 that it is not easy nor worth the time tuning.....may be I am wrong. Check this for another discussion: http://marc.info/?t=107403458800005&r=1&w=2 On Sun, Mar 16, 2014 at 9:09 PM, loody <[email protected]> wrote: > hi peter: > > > 2014-01-17 13:41 GMT+08:00 Peter Teoh <[email protected]>: > > > http://stackoverflow.com/questions/15383259/are-there-any-kernel-tools-available-to-measure-interrupt-latency-with-reasonabl > > > > checkout cyclictest. > I have checked cyclictest. > from manual page, it seems used to calculate thread latency instead of > interrupt latency > Would you please let me know if there any kind of command for using it > to check interrupt latency ? > thanks fo -- Regards, Peter Teoh
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