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Dmesg

The dmesg instruction is used to print and control kernel output information, which is saved in the early ring buffer.

The scope of this command: RedHat, RHEL, Ubuntu, CentOS, Fedora, SUSE, openSUSE.

1. Grammar

Dmesg [- c] [- r] [- n level] [- s bufsize]

2. List of options

Option

Description

-c

Clear the buffer after printing

-r

Print raw information

S

Sets the buffer size. Default is 16392.

-n

Specify the level of recorded information

3. Examples

View the boot kernel output information

[root@localhost dev] # dmesg-c / / View the information, and then delete the buffer content

. . .

E1000: eth0 NIC Link is Down

E1000: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX

40 HostNow=1 34 000ns 12.277699 timesync vgsvcTimeSyncWorker: Radical host time change: 40 928 048000 000ns (HostNow=1 539 132 201 613 000 000ns HostLast=1 539 091 273 565000 000ns)

40 000ns 34 timesync vgsvcTimeSyncWorker 22.278538 000ns: Radical guest time change: 40 932 566 440 000ns fSetTimeLastLoop=true (539 132 211 613 841 000ns GuestLast=1 539 091 279 047 401 000ns fSetTimeLastLoop=true)

Hrtimer: interrupt took 2772539 ns

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