36 lines
1.5 KiB
Bash
Executable File
36 lines
1.5 KiB
Bash
Executable File
#!/usr/bin/env bash
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TOTAL_CORES='0-7'
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HOST_CORES='0-1' # Cores reserved for host
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HOST_CORES_MASK=C0 # 0-1,6-7, bitmask 0b000011000011
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VIRT_CORES='2-7' # Cores reserved for virtual machine(s)
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# Stretch package contains an old version of cset which doesn't work (or never worked)
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#cset set -c $TOTAL_CORES -s machine.slice
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#cset shield --kthread on --cpu $VIRT_CORES
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# Reduce VM jitter: https://www.kernel.org/doc/Documentation/kernel-per-CPU-kthreads.txt
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echo 3 > /proc/sys/vm/drop_caches
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echo 1 > /proc/sys/vm/compact_memory
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# the kernel's dirty page writeback mechanism uses kthread workers. They introduce
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# massive arbitrary latencies when doing disk writes on the host and aren't
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# migrated by cset. Restrict the workqueue to use only cpu 0.
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echo $HOST_CORES_MASK > /sys/bus/workqueue/devices/writeback/cpumask
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echo $HOST_CORES_MASK > /sys/devices/virtual/workqueue/cpumask
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echo "C0" | tee /sys/devices/virtual/workqueue/*/cpumask
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# THP can allegedly result in jitter. Better keep it off.
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echo never > /sys/kernel/mm/transparent_hugepage/enabled
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# Force P-states to P0
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echo "Setting governor on all cores:"
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echo performance | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
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echo 0 > /sys/bus/workqueue/devices/writeback/numa
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echo 0 > /proc/sys/kernel/watchdog
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echo 300 > /proc/sys/vm/stat_interval
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# For single GPU passthrough
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# Unbind VTconsoles
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echo 0 > /sys/class/vtconsole/vtcon0/bind
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echo 0 > /sys/class/vtconsole/vtcon1/bind
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# Unbind EFI-Framebuffer
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echo efi-framebuffer.0 > /sys/bus/platform/drivers/efi-framebuffer/unbind
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