Comment 12 for bug 579117

Ok I have tried out cyclictest, here are the results.

I used the version from the repositories, run with the command:

sudo time cyclictest --histogram=1000000 > histogram.txt

Prior to starting cyclictest, I opened the log file viewer and went to the end of the "messages". Then I started cyclictest, then Rythmbox; then I started a song playing.

174 seconds (by the messages time stamp) into the song, there was an Underrun! message. I quit out of Rhythmbox, then quit out of cyclictest.

There is considerable output in histogram.txt :-) :-) so I deleted the run messages in front of the histogram, then all histogram buckets with a zero count. There are still 12876 lines in the reduced histogram.txt file. I took the same file and sorted it in decreasing number of counts, and I've attached that.

You can see there are a lot of hits in the 999.999 bucket (that's one second, I think?) - that seems weird to me. Over and above that, there are a significant number of hits in the 944.013 bucket (that's 0,944 seconds, I think?). And lots of other high numbers.

Does this help?