This bug is missing log files that will aid in diagnosing the problem. >From a terminal window please run:
apport-collect 1587265 and then change the status of the bug to 'Confirmed'. If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'. This change has been made by an automated script, maintained by the Ubuntu Kernel Team. ** Changed in: linux (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1587265 Title: ubuntu not work with tickless kernel boot option Status in linux package in Ubuntu: Incomplete Bug description: For redhat, we have such guide like https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/pdf/Performance_Tuning_Guide/Red_Hat_Enterprise_Linux-7-Performance_Tuning_Guide-en-US.pdf and for tickless kernel, (use dynamic tickless ways) 1. config grub with following cmdline $ cat /etc/default/grub # If you change this file, run 'update-grub' afterwards to update # /boot/grub/grub.cfg. # For full documentation of the options in this file, see: # info -f grub -n 'Simple configuration' GRUB_DEFAULT=0 GRUB_HIDDEN_TIMEOUT=0 GRUB_HIDDEN_TIMEOUT_QUIET=true GRUB_TIMEOUT=10 GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian` GRUB_CMDLINE_LINUX_DEFAULT="quiet splash isolcpus=1-2 nohz_full=1-2" GRUB_CMDLINE_LINUX="" I used nohz_full here, and it is CPU 1, 2 here. 2. update-grub after that. 3. Then reboot system 4. execute following $ sudo perf stat -C 1 -e irq_vectors:local_timer_entry taskset -c 1 stress -t 1 -c 1 stress: info: [3869] dispatching hogs: 1 cpu, 0 io, 0 vm, 0 hdd stress: info: [3869] successful run completed in 1s Performance counter stats for 'CPU(s) 1': 252 irq_vectors:local_timer_entry 1.001491203 seconds time elapsed It always 252, (the default 250 HZ), seems tickless kernel option not have any effect, whether config it or not, both have same results. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1587265/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp