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Mitigations for KVM performance issues #3

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19 changes: 19 additions & 0 deletions action.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -162,6 +162,25 @@ runs:
fi
echo "RUST_BACKTRACE=full" >> $GITHUB_ENV
shell: bash
# see https://github.com/firecracker-microvm/firecracker/blob/c75c86103d464f61851134eb3211b35323be4ffc/docs/prod-host-setup.md#linux-61-boot-time-regressions
- name: Apply perf fixes for KVM on kernel 6.x
if: ${{ (runner.os == 'Linux') }}
run: |
if command -v apt > /dev/null 2>&1; then
kernel_version=$(uname -r)
if [[ "$kernel_version" == 6.* ]]; then
if [[ $(cat /sys/devices/system/cpu/vulnerabilities/itlb_multihit) == "Not affected" ]]; then
KVM_VENDOR_MOD=$(lsmod |grep -P "^kvm_(amd|intel)" | awk '{print $1}')
sudo modprobe -r $KVM_VENDOR_MOD kvm
sudo modprobe kvm nx_huge_pages=never
sudo modprobe $KVM_VENDOR_MOD
fi
if [ -f /sys/fs/cgroup/cgroup.controllers ]; then
sudo mount -o remount,favordynmods /sys/fs/cgroup
fi
fi
fi
shell: bash

### Windows setup ###

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