Multi Channel DMA for PCI Express* Intel® FPGA IP Design Example User Guide

ID 683517
Date 12/01/2021
Public

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3.5.2.4.1.1. Set the Boot Parameters

Follow the step below to modify the default hugepages setting in grub files:

Edit /etc/default/grub file.

Append the highlighted parameters to the GRUB_CMDLINE_LINUX line in the /etc/default/grub file:

GRUB_CMDLINE_LINUX=" rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb default_hugepagesz=1G hugepagesz=1G hugepages=40 iommu=pt panic=1”

The file will look as below after the edit:

GRUB_TIMEOUT=5

GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"

GRUB_DEFAULT=saved

GRUB_DISABLE_SUBMENU=true

GRUB_TERMINAL_OUTPUT="console"

GRUB_CMDLINE_LINUX="rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb default_hugepagesz=1G hugepagesz=1G hugepages=40 iommu=pt panic=1”

GRUB_DISABLE_RECOVERY="true"

In the case of memory allocation failure at the time of Virtual Function creation, add the following boot parameters:
"pci=hpbussize=10,hpmemsize=2M,nocrs,realloc=on"

To bind the device to vfio-pci and use IOMMU, enable the following parameter: intel_iommu=on

To use UIO and not enable the IOMMU lookup, add the following parameter: iommu=pt

To use the AMD platform and the UIO driver, add the following parameter at boot

time: iommu=soft

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