Hi Kay, There are a couple of things you could check and/or add here as you provide very little information.
First of all, your kernel, -4, is relatively old. At the moment -16 is the released kernel and -19 is the latest security update. Could you please test with that one? Could you please add some information about your hardware? And attaching a dmesg would also be good. Also, the -generic kernel is geared towards desktop usage. So it provides a certain balance between realtime behaviour and throughput. One of these choices involves the preemption model within the kernel. -generic uses the voluntary preemption. You could try the -rt kernels, which have a higher preemption level, which may affect throughput. I also wonder whether ppoll really is the interface to use. The ubuntu kernels all have high res timers enabled. It is best for you to research the web about how to use these. You should be able to get below microsecond values, IIRC, on relatively modern hardware. Finally, I'm not sure whether checking an ELF note is the best way to determine the current HZ value of the kernel. First of all, that ps tool also needs to work on older kernels and second because in 2.6 there is no longer a relation between the user space HZ and the kernel HZ. -- Jiffies too low for acceptable ppoll accuracy https://bugs.launchpad.net/bugs/252728 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
