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smtCtrl
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===
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Copyright (c) 2018, Bret R. Human
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All rights reserved.
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Further documentation can be found at
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https://psi.cynicaloptimist.me/Caffarius/smtCtrl/
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Happy modding! -Bret
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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the documentation link and note, this list of conditions, and the following
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disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3. All advertising materials mentioning features or use of this
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software must display the following acknowledgment:
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"Built using software developed by Cynical Optimist - https://cynicaloptimist.me
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Ask what we can build for you at info@cynicaloptimist.me"
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4. The names "Cynical Optimist" and "Bret R. Human" and the software name listed
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at the top of this document, or the domain "cynicaloptimist.me" or any
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affiliated service must not be used to endorse or promote products derived
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from this software without prior written permission. For written permission,
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contact info@cynicaloptimist.me.
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5. Products derived from this software may not be called the software name
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listed at the top of this document nor may "Cynical Optimist" or the software
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name listed at the top of this document appear in their names without prior
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written permission of Bret R. Human.
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6. Redistributions of any form whatsoever must retain the following
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acknowledgment:
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"Built using software developed by Cynical Optimist - https://cynicaloptimist.me
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Ask what we can build for you at info@cynicaloptimist.me"
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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# smtCtrl
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Script that can enable/disable SMT at will on Ryzen systems. Includes optional systemd service to disable SMT before multi-user.target.
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Ad astra per aspera, security experts.
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[Unit]
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Description=Disable Simultaneous Multithreading
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[Service]
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Type=oneshot
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RemainAfterExit=yes
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ExecStart=/root/.script/smt.sh disable
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ExecStop=/root/.script/smt.sh status
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[Install]
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WantedBy=multi-user.target
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#!/bin/bash
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## Copyright © 2018 Bret Human
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## https://cynicaloptimist.me/
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##
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## Documentation at:
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## https://mage.cynicaloptimist.me/en/smtCtrl
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## https://psi.cynicaloptimist.me/Caffarius/smtCtrl
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##
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## For questions or comments write:
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## info@cynicaloptimist.me
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#
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# Try your best to control SMT on Ryzen CPUs.
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# Usage: ./smt.sh (enable|disable|status)
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num_cores=`lscpu | grep "CPU(s):" | grep -v "," | grep -v "-" | cut -d: -f2 | awk '{print $1}'`
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num_procs=`nproc`
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disable() {
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if [ "${num_procs}" -lt "${num_cores}" ]; then
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echo "SMT has already been disabled!"
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else
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echo -n "Disabling SMT: "
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i="1"
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while [ "${i}" -lt "${num_cores}" ]; do
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echo "0" > /sys/devices/system/cpu/cpu${i}/online
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i=$[ $i + 2 ]
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done
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unset i
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echo "Done."
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return 0
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fi
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return 1
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}
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enable() {
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if [ "${num_procs}" -eq "${num_cores}" ]; then
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echo "SMT has already been enabled!"
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else
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echo -n "Enabling SMT: "
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i="1"
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while [ "${i}" -lt "${num_cores}" ]; do
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echo "1" > /sys/devices/system/cpu/cpu${i}/online
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i=$[ $i + 2 ]
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done
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unset i
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echo "Done."
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return 0
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fi
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return 1
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}
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status() {
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cat /proc/cpuinfo |egrep "processor|physical id|core id" | sed 's/^processor/\nprocessor/g'
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}
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case "$1" in
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disable)
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disable
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;;
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enable)
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enable
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;;
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status)
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status
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;;
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*)
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echo " Usage: ./smt.sh (disable | enable | status)"
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;;
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esac
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