use the kernel core_pattern parameter. This may be useful if you want to save the core in an NFS location.
[root@test:~]$cat /proc/sys/kernel/core_pattern
/var/core/dumps/%t_%e_core.%p
[root@test:~]$sysctl -w kernel.core_pattern=’/remote/dumps/%t_%e_core.%p’
[root@test:~]$cat /proc/sys/kernel/core_pattern
/remote/dumps/%t_%e_core.%p
Good article on how to determine the PCIe bus speed and width detected at host linux operating system. useful to know any issues on the hardware side.
Nice article on using printk for debugging. It explains the usage, log level, rate limiting and one time messaging, changing the size of printk buffer, debugging early boot problems etc.
Refer Debugging by printing
Nice article on how to enable and use the sysrq key.
Source: Linux Magic System Request Key Hacks — The Linux Kernel documentation
A .tar.gz file is nothing, but a compressed archive. The below URL provides a list of commonly used tar commands.
Source: How To Extract .tar.gz Files using Linux Command Line – Interserver Tips
Clear PageCache only.
# sync; echo 1 > /proc/sys/vm/drop_caches
Clear dentries and inodes.
# sync; echo 2 > /proc/sys/vm/drop_caches
Clear PageCache, dentries and inodes.
# sync; echo 3 > /proc/sys/vm/drop_caches
The random changes have been sent in for Linux 5.6 that yield /dev/random behavioral changes and a new random flag.
Source: /dev/random Is More Like /dev/urandom With Linux 5.6 – Phoronix