65 lines
2.1 KiB
Bash
Executable file
65 lines
2.1 KiB
Bash
Executable file
#!/bin/bash
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# requires `cset`
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# available on Fedora through my COPR:
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# - https://copr.fedorainfracloud.org/coprs/jlay/cpuset/
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# review notes regarding XML entries
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# this script:
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# - isolates host tasks from the VM CPUs
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# - applies some generic tweaks
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# - resets host isolation on VM shutdown
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# Set the range of cores assigned to the windows VM
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# on an i9-7920x this is the first 8 cores and the corresponding hyperthreads
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VM_CORES='0-7,12-19'
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# based on the assignments of pinned CPUs in libvirt XML, eg:
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# <vcpupin vcpu='0' cpuset='0'/>
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# <vcpupin vcpu='1' cpuset='12'/>
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# [...]
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# <vcpupin vcpu='14' cpuset='7'/>
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# <vcpupin vcpu='15' cpuset='19'/>
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#
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# `lscpu -e` and `virsh capabilities` are helpful for determining valid pinning settings
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# on example system (i9 7920x), vCPUs 0-15 are pinned (alternating between) cores 0-7 and hyperthreads 12-19
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# reduce kernel jitter
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sudo sysctl vm.stat_interval=120
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sudo sysctl kernel.watchdog=0
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# isolate VM CPUs from host tasks
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# VM must have the partition cset uses w/ userset below defined in libvirt XML, eg:
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#
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# </cputune> ... reference line
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# <resource>
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# <partition>/windows10</partition>
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# </resource>
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# <os> ... reference line
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# first, attempt to reset shielding. we want to recreate conflicting names with set params
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sudo cset shield --reset --sysset=host.slice --userset=windows10.slice
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sudo cset set -d windows10.slice
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# shield cores
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sudo cset shield -c $VM_CORES --sysset=host.slice --userset=windows10.slice
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# start the VM
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sudo virsh start windows10
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# set higher priority
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QEMU_PID=$(sudo ps fauxww | awk '$0 ~ /qemu.*windows1[0]/ {print $2}')
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sudo renice -20 -p ${QEMU_PID}
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sudo chrt -f -p 99 ${QEMU_PID}
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echo "Waiting for windows10 VM to stop before resetting cpusets"
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while true; do
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# chill a bit
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sleep 10
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# get vm state, check if it's off
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VM_STATE=$(sudo virsh dominfo windows10 | awk '$1 ~ /State/ {print $NF}')
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if [ "$VM_STATE" == 'off' ]; then
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echo -e "windows10 VM shut down, setting cpusets back to normal\n"
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sudo cset shield --reset --sysset=host.slice --userset=windows10.slice
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exit 0
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fi
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done
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