How can I set isolated cpu on orange pi zero?

[Marcus Nguyen]

Hi everyone,

As the title, I would like to set the isolated cpu 3th on orange pi zero (armbian v4.19.62)

I've try to follow this answer of ChrisK in the topic here

And the boot.cmd file after edited as below:

# DO NOT EDIT THIS FILE
#
# Please edit /boot/armbianEnv.txt to set supported parameters
#

setenv load_addr "0x44000000"
setenv overlay_error "false"
# default values
setenv verbosity "1"
setenv console "both"
setenv disp_mem_reserves "off"
setenv disp_mode "1920x1080p60"
setenv rootfstype "ext4"
setenv docker_optimizations "on"
setenv devnum "0"
setenv rootdev "/dev/mmcblk${devnum}p1"
setenv bootargs console=ttyS0,115200 noinitrd root=/dev/mmcblk0p2 rootfstype=ext4 rootwait isolcpus=3

# Print boot source
itest.b *0x28 == 0x00 && echo "U-boot loaded from SD"
itest.b *0x28 == 0x02 && echo "U-boot loaded from eMMC or secondary SD"
itest.b *0x28 == 0x03 && echo "U-boot loaded from SPI"

# get PARTUUID of first partition on SD/eMMC it was loaded from
# mmc 0 is always mapped to device u-boot (2016.09+) was loaded from
if test "${devtype}" = "mmc"; then
  part uuid mmc ${devnum}:1 partuuid;
  setenv devnum ${mmc_bootdev}
  setenv rootdev "/dev/mmcblk${mmc_bootdev}p1"
fi

echo "Boot script loaded from ${devtype}"

if test -e ${devtype} ${devnum} ${prefix}armbianEnv.txt; then
	load ${devtype} ${devnum} ${load_addr} ${prefix}armbianEnv.txt
	env import -t ${load_addr} ${filesize}
fi

if test "${logo}" = "disabled"; then setenv logo "logo.nologo"; fi

if test "${console}" = "display" || test "${console}" = "both"; then setenv consoleargs "console=ttyS0,115200 console=tty1"; fi
if test "${console}" = "serial"; then setenv consoleargs "console=ttyS0,115200"; fi

setenv bootargs "root=${rootdev} rootwait rootfstype=${rootfstype} ${consoleargs} hdmi.audio=EDID:0 disp.screen0_output_mode=${disp_mode} panic=10 consoleblank=0 loglevel=${verbosity} ubootpart=${partuuid} ubootsource=${devtype} usb-storage.quirks=${usbstoragequirks} ${extraargs} ${extraboardargs}"

if test "${disp_mem_reserves}" = "off"; then setenv bootargs "${bootargs} sunxi_ve_mem_reserve=0 sunxi_g2d_mem_reserve=0 sunxi_fb_mem_reserve=16"; fi
if test "${docker_optimizations}" = "on"; then setenv bootargs "${bootargs} cgroup_enable=memory swapaccount=1"; fi

load ${devtype} ${devnum} ${ramdisk_addr_r} ${prefix}uInitrd
load ${devtype} ${devnum} ${kernel_addr_r} ${prefix}zImage

if test -e ${devtype} ${devnum} "${prefix}.next"; then
	echo "Found mainline kernel configuration"
	load ${devtype} ${devnum} ${fdt_addr_r} ${prefix}dtb/${fdtfile}
	fdt addr ${fdt_addr_r}
	fdt resize 65536
	for overlay_file in ${overlays}; do
		if load ${devtype} ${devnum} ${load_addr} ${prefix}dtb/overlay/${overlay_prefix}-${overlay_file}.dtbo; then
			echo "Applying kernel provided DT overlay ${overlay_prefix}-${overlay_file}.dtbo"
			fdt apply ${load_addr} || setenv overlay_error "true"
		fi
	done
	for overlay_file in ${user_overlays}; do
		if load ${devtype} ${devnum} ${load_addr} ${prefix}overlay-user/${overlay_file}.dtbo; then
			echo "Applying user provided DT overlay ${overlay_file}.dtbo"
			fdt apply ${load_addr} || setenv overlay_error "true"
		fi
	done
	if test "${overlay_error}" = "true"; then
		echo "Error applying DT overlays, restoring original DT"
		load ${devtype} ${devnum} ${fdt_addr_r} ${prefix}dtb/${fdtfile}
	else
		if load ${devtype} ${devnum} ${load_addr} ${prefix}dtb/overlay/${overlay_prefix}-fixup.scr; then
			echo "Applying kernel provided DT fixup script (${overlay_prefix}-fixup.scr)"
			source ${load_addr}
		fi
		if test -e ${devtype} ${devnum} ${prefix}fixup.scr; then
			load ${devtype} ${devnum} ${load_addr} ${prefix}fixup.scr
			echo "Applying user provided fixup script (fixup.scr)"
			source ${load_addr}
		fi
	fi
	bootz ${kernel_addr_r} ${ramdisk_addr_r} ${fdt_addr_r}
else
	echo "Found legacy kernel configuration"
	load ${devtype} ${devnum} ${fdt_addr_r} ${prefix}script.bin
	bootz ${kernel_addr_r} ${ramdisk_addr_r}
fi

# Recompile with:
# mkimage -C none -A arm -T script -d /boot/boot.cmd /boot/boot.scr

However, it seem to be not successful. I need to set isolated cpu to improve the performance of my module.

Thank for kind help!

 

[dolphs]

not entirely sure if this is what you are looking for?

ps axf | grep <your process> | grep -v grep | awk '{print "taskset -cp 3 " $1}' | sh
  #where cp 3 is core 4 (0-4)

 

[Marcus Nguyen]

15 minutes ago, dolphs said:

not entirely sure if this is what you are looking for?

ps axf | grep <your process> | grep -v grep | awk '{print "taskset -cp 3 " $1}' | sh
  #where cp 3 is core 4 (0-4)

 

This is action which set a module using a isolated cpu. I need to set the cpu which should be isolated first

[yoq]

You can free up a core using isolcpus kernel parameter and then move your task on the unused core using taskset:

simply set it by adding extraargs=isolcpus=1 to your /boot/armbianEnv.txt
https://codywu2010.wordpress.com/2015/09/27/isolcpus-numactl-and-taskset/