slv-smt-disable

slv-smt-disable is a skill for Claude Code, Codex from ValidatorsDAO/slv. It costs 44 tokens per session (365 once invoked), scanned B, original, Apache-2.0.

A server-tuning procedure that turns off SMT, also called Hyper-Threading, so each physical CPU core runs one hardware thread. It changes the GRUB boot settings and requires a reboot.

In plain words
What is it for?
Use it when preparing a Solana validator or RPC host where consistent single-thread speed matters, then verify the setting after reboot.
Why use it?
It is intended to make single-thread performance on Solana validator and RPC servers more stable by removing competition between sibling threads.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/validatorsdao/slv/slv-smt-disable
Any agent
npx skills add ValidatorsDAO/slv --skill slv-smt-disable
Clone the repo
git clone --depth 1 https://github.com/ValidatorsDAO/slv

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for slv-smt-disable

README.md
[![agentmods](https://agentmods.dev/badge/skills/validatorsdao/slv/slv-smt-disable.svg)](https://agentmods.dev/skills/validatorsdao/slv/slv-smt-disable)
Your own site
<a href="https://agentmods.dev/skills/validatorsdao/slv/slv-smt-disable"><img src="https://agentmods.dev/badge/skills/validatorsdao/slv/slv-smt-disable.svg" alt="Measured on agentmods" height="20"></a>
Per session 44 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 365 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00044 $0.00365
Opus 5 $0.00022 $0.00182
Sonnet 5 $0.00009 $0.00073
Haiku 4.5 $0.00004 $0.00036

Measured 5d ago against content hash 5e1afe7aa498, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade B, and why

slv-smt-disable scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

sudo sed -i 's/ nosmt=force//' /etc/default/grub
oss-skills/slv-smt-disable/SKILL.md · 43 lines

What it actually says

SLV SMT (Hyper-Threading) Disable Skill

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.

How it works

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
  • Idempotency marker: /var/lib/slv/.smt_disabled

Standalone run

ansible-playbook -i inventory.yml cmn/smt_disable.yml --limit <host>

Sets need_reboot=true only when GRUB actually changed; the orchestrator reboots when needed.

Verification

# on the host
cat /proc/cmdline                      # should contain nosmt=force
lscpu | grep -E 'Thread|Core|Socket'   # Thread(s) per core: 1

Rollback

sudo sed -i 's/ nosmt=force//' /etc/default/grub
sudo update-grub
sudo rm /var/lib/slv/.smt_disabled
sudo reboot
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 5d ago First seen · 43 lines · 44 tokens per session scan B 5e1afe7aa498

Subscribe to this mod's changes

slv-smt-disable is a skill published in the GitHub repository ValidatorsDAO/slv (89 stars, last pushed yesterday), licensed Apache-2.0. It adds 44 tokens to every session and 365 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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