dmesg -T + how to expand dmesg info in order to verify history details

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we have rhel 7.2 server

from dmesg -T we see only the current date - Mon Jan 11 and not history dates as jan 10 , or less then jan 10

dmesg -T
[Mon Jan 11 12:02:53 2021] Initializing cgroup subsys cpuset
[Mon Jan 11 12:02:53 2021] Initializing cgroup subsys cpu
[Mon Jan 11 12:02:53 2021] Initializing cgroup subsys cpuacct
[Mon Jan 11 12:02:53 2021] Disabled fast string operations
[Mon Jan 11 12:02:53 2021] e820: BIOS-provided physical RAM map:
[Mon Jan 11 12:02:53 2021] BIOS-e820: [mem 0x0000000000000000-0x000000000009ebff] usable
[Mon Jan 11 12:02:53 2021] BIOS-e820: [mem 0x000000000009ec00-0x000000000009ffff] reserved
[Mon Jan 11 12:02:53 2021] BIOS-e820: [mem 0x00000000000dc000-0x00000000000fffff] reserved
[Mon Jan 11 12:02:53 2021] BIOS-e820: [mem 0x0000000000100000-0x00000000bfecffff] usable
[Mon Jan 11 12:02:53 2021] BIOS-e820: [mem 0x00000000bfed0000-0x00000000bfefefff] ACPI data
[Mon Jan 11 12:02:53 2021] BIOS-e820: [mem 0x00000000bfeff000-0x00000000bfefffff] ACPI NVS
[Mon Jan 11 12:02:53 2021] BIOS-e820: [mem 0x00000000bff00000-0x00000000bfffffff] usable
[Mon Jan 11 12:02:53 2021] BIOS-e820: [mem 0x00000000f0000000-0x00000000f7ffffff] reserved
[Mon Jan 11 12:02:53 2021] BIOS-e820: [mem 0x00000000fec00000-0x00000000fec0ffff] reserved
[Mon Jan 11 12:02:53 2021] BIOS-e820: [mem 0x00000000fee00000-0x00000000fee00fff] reserved
[Mon Jan 11 12:02:53 2021] BIOS-e820: [mem 0x00000000fffe0000-0x00000000ffffffff] reserved
[Mon Jan 11 12:02:53 2021] BIOS-e820: [mem 0x0000000100000000-0x0000000427ffffff] usable
[Mon Jan 11 12:02:53 2021] NX (Execute Disable) protection: active
[Mon Jan 11 12:02:53 2021] SMBIOS 2.7 present.
[Mon Jan 11 12:02:53 2021] DMI: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 12/12/2018
[Mon Jan 11 12:02:53 2021] Hypervisor detected: VMware
[Mon Jan 11 12:02:53 2021] vmware: TSC freq read from hypervisor : 2397.223 MHz
[Mon Jan 11 12:02:53 2021] vmware: Host bus clock speed read from hypervisor : 66000000 Hz
[Mon Jan 11 12:02:53 2021] vmware: using sched offset of 8561845015 ns
[Mon Jan 11 12:02:53 2021] e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
[Mon Jan 11 12:02:53 2021] e820: remove [mem 0x000a0000-0x000fffff] usable
[Mon Jan 11 12:02:53 2021] e820: last_pfn = 0x428000 max_arch_pfn = 0x400000000
[Mon Jan 11 12:02:53 2021] MTRR default type: uncachable
[Mon Jan 11 12:02:53 2021] MTRR fixed ranges enabled:
[Mon Jan 11 12:02:53 2021]   00000-9FFFF write-back
[Mon Jan 11 12:02:53 2021]   A0000-BFFFF uncachable
[Mon Jan 11 12:02:53 2021]   C0000-CBFFF write-protect
[Mon Jan 11 12:02:53 2021]   CC000-EFFFF uncachable
[Mon Jan 11 12:02:53 2021]   F0000-FFFFF write-protect
    [Mon Jan 11 12:02:53 2021] MTRR variable ranges enabled:
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what is the dmesg setting or dmesg changes that we need to do in order to expand the dmesg details and see also dmesg info?

linux
redhat
kernel
dmesg
asked on Server Fault Jan 11, 2021 by sheffadmin

0 Answers

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