79 lines
2.3 KiB
Bash
79 lines
2.3 KiB
Bash
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#!/bin/bash
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# SPDX-License-Identifier: BSD-3-Clause
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# Copyright 2018-2019 NXP
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# This script should be executed as root user.
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function validate_root_user() {
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if [ "$EUID" -ne 0 ]
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then
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echo "Not a root user!."
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echo "This script should be run as 'root' (not sudo)."
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return 1
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fi
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return 0
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}
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validate_root_user
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if [ $? -ne 0 ]
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then
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[ "$0" == "-bash" ] && return 1 || exit 1
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fi
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# Enable the 'performance' mode for the CPU power governors
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# This currently supports 16 cores and breaks out after first non-available
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# core.
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for i in `seq 0 15`
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do
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if [ -e "/sys/devices/system/cpu/cpu${i}/cpufreq/scaling_governor" ]
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then
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echo 'performance' > /sys/devices/system/cpu/cpu${i}/cpufreq/scaling_governor
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else
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echo "Setting performance mode on ${i} cores only."
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break
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fi
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done
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echo "Check that all I/O cores required has 'performance' mode enabled"
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for i in `seq 0 15`
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do
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if [ -e "/sys/devices/system/cpu/cpu${i}/cpufreq/scaling_governor" ]
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then
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echo -n "CPU governor mode $i:"
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cat /sys/devices/system/cpu/cpu${i}/cpufreq/scaling_governor
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else
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break
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fi
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done
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# Disable some watchdogs so as not to complain in case RT priority process
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# of DPDK application hog the CPU. Ignore errors like non-existent file.
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(echo 0 > /proc/sys/kernel/hung_task_timeout_secs) 2> /dev/null
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(echo 0 > /proc/sys/kernel/nmi_watchdog) 2> /dev/null
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(echo 0 > /proc/sys/kernel/hung_task_check_count) 2> /dev/null
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(echo 0 > /proc/sys/kernel/hung_task_warnings) 2> /dev/null
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(echo 0 > /proc/sys/kernel/soft_watchdog) 2> /dev/null
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# Finally, reduce timeslice for non-RT processes. This directly impacts the
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# Core 0 (non-isolated cores). Once this is set, a RT application which
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# doesn't yield the CPU would stall it.
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if [ -e "/proc/sys/kernel/sched_rt_runtime_us" ]
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then
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echo -1 > /proc/sys/kernel/sched_rt_runtime_us
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echo "WARN: Hereafter, don't execute RT tasks on Core 0"
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else
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echo "Unable to reduce non-RT timeslice; Performance will be reduced"
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fi
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# Enable the DPDK Performance mode; This script should be 'source'd rather
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# than directly executed for this to take effect.
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if [ "$0" != "-bash" ]
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then
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# this script was probably executed using "./enable_performance_mode"
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echo "This script should be sourced and not directly executed!"
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echo "Please run:"
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echo "export NXP_CHRT_PERF_MODE=1"
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else
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export NXP_CHRT_PERF_MODE=1
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fi
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