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31.2. Displaying Information About a Module
You can display detailed information about a kernel module by running the
modinfo <module_name> command.
Note
When entering the name of a kernel module as an argument to one of the module-init-tools utilities, do not append a
.ko extension to the end of the name. Kernel module names do not have extensions: their corresponding files do.
For example, to display information about the
e1000e module, which is the Intel PRO/1000 network driver, run:
Example 31.1. Listing information about a kernel module with lsmod
~]#modinfo e1000efilename: /lib/modules/2.6.32-71.el6.x86_64/kernel/drivers/net/e1000e/e1000e.ko version: 1.2.7-k2 license: GPL description: Intel(R) PRO/1000 Network Driver author: Intel Corporation, <linux.nics@intel.com> srcversion: 93CB73D3995B501872B2982 alias: pci:v00008086d00001503sv*sd*bc*sc*i* alias: pci:v00008086d00001502sv*sd*bc*sc*i* [somealiaslines omitted] alias: pci:v00008086d0000105Esv*sd*bc*sc*i* depends: vermagic: 2.6.32-71.el6.x86_64 SMP mod_unload modversions parm: copybreak:Maximum size of packet that is copied to a new buffer on receive (uint) parm: TxIntDelay:Transmit Interrupt Delay (array of int) parm: TxAbsIntDelay:Transmit Absolute Interrupt Delay (array of int) parm: RxIntDelay:Receive Interrupt Delay (array of int) parm: RxAbsIntDelay:Receive Absolute Interrupt Delay (array of int) parm: InterruptThrottleRate:Interrupt Throttling Rate (array of int) parm: IntMode:Interrupt Mode (array of int) parm: SmartPowerDownEnable:Enable PHY smart power down (array of int) parm: KumeranLockLoss:Enable Kumeran lock loss workaround (array of int) parm: WriteProtectNVM:Write-protect NVM [WARNING: disabling this can lead to corrupted NVM] (array of int) parm: CrcStripping:Enable CRC Stripping, disable if your BMC needs the CRC (array of int) parm: EEE:Enable/disable on parts that support the feature (array of int)
Here are descriptions of a few of the fields in
modinfo output:
- filename
- The absolute path to the
.kokernel object file. You can usemodinfo -nas a shortcut command for printing only thefilenamefield. - description
- A short description of the module. You can use
modinfo -das a shortcut command for printing only the description field. - alias
- The
aliasfield appears as many times as there are aliases for a module, or is omitted entirely if there are none. - depends
- This field contains a comma-separated list of all the modules this module depends on.
Note
If a module has no dependencies, thedependsfield may be omitted from the output. - parm
- Each
parmfield presents one module parameter in the formparameter_name:description, where:- parameter_name is the exact syntax you should use when using it as a module parameter on the command line, or in an option line in a
.conffile in the/etc/modprobe.d/directory; and, - description is a brief explanation of what the parameter does, along with an expectation for the type of value the parameter accepts (such as int, unit or array of int) in parentheses.
You can list all parameters that the module supports by using the-poption. However, because useful value type information is omitted frommodinfo -poutput, it is more useful to run:Example 31.2. Listing module parameters
~]#
modinfo e1000e | grep "^parm" | sortparm: copybreak:Maximum size of packet that is copied to a new buffer on receive (uint) parm: CrcStripping:Enable CRC Stripping, disable if your BMC needs the CRC (array of int) parm: EEE:Enable/disable on parts that support the feature (array of int) parm: InterruptThrottleRate:Interrupt Throttling Rate (array of int) parm: IntMode:Interrupt Mode (array of int) parm: KumeranLockLoss:Enable Kumeran lock loss workaround (array of int) parm: RxAbsIntDelay:Receive Absolute Interrupt Delay (array of int) parm: RxIntDelay:Receive Interrupt Delay (array of int) parm: SmartPowerDownEnable:Enable PHY smart power down (array of int) parm: TxAbsIntDelay:Transmit Absolute Interrupt Delay (array of int) parm: TxIntDelay:Transmit Interrupt Delay (array of int) parm: WriteProtectNVM:Write-protect NVM [WARNING: disabling this can lead to corrupted NVM] (array of int)
