Comedi default maximum asynchronous buffer size in KiB

configname: CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB

Linux Kernel Configuration
└─>Device Drivers
└─>Data acquisition support (comedi)
└─>Comedi default maximum asynchronous buffer size in KiB
In linux kernel since version 3.1 (release Date: 2011-10-24)  
This is the default maximum asynchronous buffer size which can
be requested by a userspace program without root privileges.
This is set to 20480 KiB so that a fast I/O card with 16
channels running at 100 kHz has 2-4 seconds of buffer.

depends
CONFIG_COMEDI