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Today I noticed an issue with the timestamps in my Linux box running redhat 7.3. The timestamp as shown in dmesg is behind of the one shown in /proc/uptime

# echo TEST > /dev/kmsg &&  dmesg | tail -1 && cat /proc/uptime
  [661503.956980] TEST
  661301.99 15107232.56

As I understand, they both shows the number of seconds passed since the kernel initialized. Then what could be causing the difference here ?

PHINCY L PIOUS
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1 Answers1

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dmesg timestamps show CLOCK_MONOTONIC, while /proc/uptime shows CLOCK_BOOTTIME.

See 'man timer_create' for details on what CLOCK_* is.

Nikita Yushchenko
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