القائمة
Disable SMT (Hyper-Threading) by adding `nosmt=force` to GRUB. Required for stable single-thread performance on Solana validators / RPCs. Reboot required.
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استنادا إلى تصنيف SOC المهني
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NIC IRQ 1:1 pinning, NVMe queue limits, RPS/XPS, NIC ring buffer, sysctl (UDP/TCP buffers, swappiness, netdev_max_backlog), THP off, and ulimit nofile=1M for Solana / Shredstream nodes. Reboot is required when NVMe queue parameters change.
| name | slv-smt-disable |
| description | Disable SMT (Hyper-Threading) by adding `nosmt=force` to GRUB. Required for stable single-thread performance on Solana validators / RPCs. Reboot required. |
Solana validator / RPC throughput is dominated by single-thread instruction performance, so disabling SMT consistently produces higher and more stable performance. Applied during slv v init / slv r init as part of the tuning phase.
Adds nosmt=force to GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub and runs update-grub. After reboot, the kernel only schedules on one logical thread per physical core.
ansible/cmn/smt_disable.yml — appends nosmt=force to GRUB and runs update-grub/var/lib/slv/.smt_disabledansible-playbook -i inventory.yml cmn/smt_disable.yml --limit <host>
Sets need_reboot=true only when GRUB actually changed; the orchestrator reboots when needed.
# on the host
cat /proc/cmdline # should contain nosmt=force
lscpu | grep -E 'Thread|Core|Socket' # Thread(s) per core: 1
sudo sed -i 's/ nosmt=force//' /etc/default/grub
sudo update-grub
sudo rm /var/lib/slv/.smt_disabled
sudo reboot