Hello everyone. I've installed 18.04 on a Desktop and I've inserted an ADLINK DMA parallel I/O card.
What kernel boot parameter(s) do I adjust in order to allocate 20Mbytes of contiguous high memory space for the DMA?
The Linux section of the driver install guide is VERY old - circa Ubuntu 12.04. In that section it says:
"To prevent reduced data transfer performance caused by memory fragment, the PCIS-DASK allocates physically contigu-
ous buffers in device driver at system startup time. For contiguous memory allocation, we reserve memory in the upper memory space.
Users need to pass a command line argument to the kernel."
They go on to show how it's done if you use GRUB as your bootloader. But it's ancient. For example
they talk about editing /etc/grub.conf and adding a "mem=" statement to the grub.conf file.
For example add mem=60M .
But I do not have an /etc/grub.conf file. I do see the /etc/grub.d directory and I see the files underneath.
I do see this web page which tells me how to modify/add/update kernel boot parameters:
https://wiki.ubuntu.com/Kernel/KernelBootParameters
But web searches on available boot parameters do not include "mem="
Any help would be greatly appreciated.
Adv Reply
Bookmarks