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Comments (6)

sofar avatar sofar commented on June 9, 2024

from your earlier logs I caught this:

Jan 01 04:07:44 ev3dev kernel: Kernel command line: mem=64M console=ttyS1,115200n8 root=/dev/mmcblk0p2 rw rootwait splash init=/lib/systemd/systemd-bootchart
Jul 31 13:40:39 ev3dev systemd-bootchart[603]: Bootchart created: /run/log/bootchart-20150731-1340.svg

Most likely, it doesn't like starting 1-1-1970 and the subsequent time change, even though internally it mostly uses CLOCK_MONOTONIC.

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ensonic avatar ensonic commented on June 9, 2024

Thanks for pointing this out. I can check what can be done on the ev3 kernel (@dlech). In case you have ideas where bootchart is not using the monotonic clock yet, that'd be great too.

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sofar avatar sofar commented on June 9, 2024

systemd-bootchart is only ever using the CLOCK_MONOTONIC clock, but it may not be reliable on your platform?

systemd-bootchart/src/store.c

Line 56 in e6c5e46

clock_gettime(CLOCK_MONOTONIC, &n);

from systemd-bootchart.

dlech avatar dlech commented on June 9, 2024

There are 2 things I have found that might help with the time change.

  1. https://packages.debian.org/jessie/fake-hwclock
  2. RTC_HCTOSYS=n in the kernel configuration

Also turning off NTP or disconnecting from the Internet while booting should keep the time from changing.

from systemd-bootchart.

sofar avatar sofar commented on June 9, 2024

395d046 could be related, and fix this issue.

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gk4 avatar gk4 commented on June 9, 2024

I'm using bootchart 2.3.2 and I'm experiencing the same behavior. Are there any workarounds or hints to debug the issue?

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