Hi Tim > -----Ursprüngliche Nachricht----- > Von: Tim Sander [mailto:tim@xxxxxxxxxxxxxxx] > Gesendet: Donnerstag, 25. Februar 2016 13:34 > An: Wirth, Martin > Cc: linux-rt-users@xxxxxxxxxxxxxxx > Betreff: Re: Large latencies with 4.4.1-rt6 > > Hi Martin > > Am Freitag, 19. Februar 2016, 17:02:20 schrieb Martin.Wirth@xxxxxx: > > I today switched from 4.1.15-rt17 to 4.4.1-rt6. > > Now I'm seeing large latencies of more than 1 ms. > > They occur sporadic ( every few minutes) and show up for example > > running > It would be interesting to know the platform the rt kernel is running on? This is an intel i7-4700EQ CPU @ 2.40GHz machine on an ADLINK cPCI-6530 board. > I have also seen a latency increase with 4.4.1-rtX releases. I have the > impression that some stable kernel updates made it worse. Care to test 4.4- > rt3 or 4.4-rt4? Had not the chance to pin them down by now. > The worst case cyclictest latencies (running over serveral hours) with pre 4.4.x-rt versions were below 10 µs for an idle system and below 23 µs for a kernel compile with make -j4. Since this is a machine with is in lab-use during the day I hesitate a bit to try too early 4.4.x version which might be instable enough to eat my disk. Best regards, Martin -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
