nr_pdflush_threads exported in /proc is scheduled for removal EXT4-fs (nvme0n1p1): resized filesystem to 15728123 random: rngd: uninitialized urandom read (16 bytes read) netlink: 12 bytes leftover after parsing attributes in process `ip'. random: vgs: uninitialized urandom read (4 bytes read) random: dd: uninitialized urandom read (4096 bytes read) random: lvm: uninitialized urandom read (4 bytes read) ena 0000:00:05.0: LLQ is not supported Fallback to host mode policy. mousedev: PS/2 mouse device common for all mice input: ImPS/2 Generic Wheel Mouse as /devices/platform/i8042/serio1/input/input3 ena: ena controller version: 0.0.1 implementation version 1 input: Sleep Button as /devices/LNXSYSTM:00/LNXSLPBN:00/input/input5 input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input4 random: init: uninitialized urandom read (12 bytes read) dracut: Mounted root filesystem /dev/nvme0n1p1 x86/fpu: Enabled xstate features 0x7, context size is 832 bytes, using 'standard' format. x86/fpu: xstate_offset: 576, xstate_sizes: 256 x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers' x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers' x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers' Command line: root=LABEL=/ console=tty1 console=ttyS0 selinux=0 nvme_core.io_timeout=4294967295 When the above command is issued, all the kernel messages which are present in the ring buffer will be printed in the console as shown below: Linux version 4.14.86_64 (gcc version 7.2.1 20170915 (Red Hat 7.2.1-2) (GCC)) #1 SMP Fri Oct 30 18:56: Here is how you can invoke this command: dmesg It includes messages related to the device driver, OS patching, memory, disk drives, network, etc… Thus, if your application suffers from performance problems, you may use this command to determine whether it’s caused due to any kernel-related problems. ‘dmesg’ command prints all the kernel-related log messages in the console. Kernel is the core part of the operating system responsible for the effective functioning of the device. However, it provides vital information that can be used for troubleshooting production performance problems. ‘dmesg’ (display message) is not a popular Unix/Linux command.
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