There is a os.sh script that lists a lot of kernel parameters in folder bin which can be used for production use with minor changes. Below parameters need attention, and more details please refer to documentation for /proc/sys/vm/*[1].
vm.extra_free_kbytes, tells the VM to keep extra free memory between the threshold where background reclaim (kswapd) kicks in, and the threshold where direct reclaim (by allocating processes) kicks in. RocketMQ uses this parameter to avoid high latency in memory allocation.
vm.min_free_kbytes, if you set this to lower than 1024KB, your system will become subtly broken, and prone to deadlock under high loads.
vm.max_map_count, limits the maximum number of memory map areas a process may have. RocketMQ will use mmap to load CommitLog and ConsumeQueue, so set a bigger value for this parameter is recommended.
vm.swappiness, define how aggressive the kernel will swap memory pages. Higher values will increase agressiveness, lower values decrease the amount of swap. 10 for this value to avoid swap latency is recommended.
File descriptor limits, RocketMQ needs open file descriptors for files(CommitLog and ConsumeQueue) and network connections. We recommend set 655350 for file descriptors.
Disk scheduler, the deadline I/O scheduler is recommended for RocketMQ, which attempts to provide a guaranteed latency for requests[2].
