function::set_kernel_long - Linux
Overview
The function::set_kernel_long
sets a kernel function parameter to a 64-bit integer value. This command is used to fine-tune the behavior of various Linux kernel functions and modules, allowing for advanced customization and optimization.
Syntax
function::set_kernel_long <function_name> <parameter_name> <64-bit_integer_value>
Options/Flags
None.
Examples
Example 1: Set the Maximum Retries for a SCSI Disk
function::set_kernel_long scsi_disk_max_retries 4
This command sets the maximum number of retries for SCSI disk operations to 4, potentially improving performance for unreliable storage devices.
Example 2: Adjust the Size of TCP Send Buffer
function::set_kernel_long tcp_wmem 12582912
This command increases the TCP send buffer size to 12 MB, potentially reducing latency and improving throughput for network transfers.
Common Issues
- Invalid Function Name: Ensure that the specified function name corresponds to a valid kernel function that accepts a 64-bit integer parameter.
- Invalid Parameter: Verify that the parameter name is correct and refers to a valid parameter within the kernel function.
- Permission Errors: The command may require root privileges to access and modify kernel parameters.
Integration
The function::set_kernel_long
command can be combined with other tools for advanced system administration tasks:
- sysctl: To perform temporary changes to kernel parameters, e.g.
sysctl -w function::set_kernel_long.fiber 1
. - Bash Scripting: Embed the command into scripts for automated configuration or performance tuning.
Related Commands
sysctl
– Set and display kernel parameters.proc
– Inspect kernel and system information.dmesg
– Display kernel boot messages.