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[Bug 1587265] Re: ubuntu not work with tickless kernel boot option
I could not run it, as
test@test-ThinkCentre-M92P:~$ apport-collect 1587265
ERROR: connecting to Launchpad failed: [Errno 110] Connection timed out
You can reset the credentials by removing the file "/home/test/.cache/apport/launchpad.credentials"
and also I am not sure if that report could collect sensitive info from
my system or not, so I could not upload such log now.
I think the description is clear, so mark it confirmed now,
Let me know if have other ways to collect logs. Thanks
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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ubuntu not work with tickless kernel boot option
Status in linux package in Ubuntu:
For redhat, we have such guide like
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
# For full documentation of the options in this file, see:
# info -f grub -n 'Simple configuration'
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash isolcpus=1-2 nohz_full=1-2"
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:  dispatching hogs: 1 cpu, 0 io, 0 vm, 0 hdd
stress: info:  successful run completed in 1s
Performance counter stats for 'CPU(s) 1':
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.
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