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@PeaBrane PeaBrane commented Jul 28, 2025

Overview:

as titled

Summary by CodeRabbit

  • Documentation
    • Added a comprehensive README for the KV Router, including setup instructions, configuration options, architectural details, and tuning guidelines.
    • Removed the separate KV Router performance tuning guide, consolidating relevant information into the new README.

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coderabbitai bot commented Jul 28, 2025

Walkthrough

A new, detailed README for the KV Router component has been added, providing an overview, configuration, architecture, and tuning guidelines. An older, more narrowly focused KV Router performance tuning guide has been removed. No code or exported entities were changed.

Changes

Cohort / File(s) Change Summary
New KV Router Documentation
docs/components/router/README.md
Added a comprehensive README for the KV Router, covering its purpose, configuration, architecture, routing cost function, cache tracking modes, and tuning.
Removed Tuning Guide
docs/guides/kv_router_perf_tuning.md
Deleted an older, detailed performance tuning guide for the KV Router, previously describing tuning parameters, cost functions, and monitoring strategies.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

Poem

In Dynamo’s warren, a router was born,
With docs so detailed, no bunny forlorn.
Old tuning scrolls now gently retired,
New guides for all, as users required.
Hop to the README, let wisdom accrue—
The KV Router’s secrets, now clear as dew!
🐇✨

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Actionable comments posted: 0

🧹 Nitpick comments (2)
docs/components/router/README.md (2)

75-77: Add language specifiers to fenced code blocks

markdownlint (MD040) flags both fenced blocks because they omit an explicit language tag.
Specify something like text to silence the linter and improve syntax highlighting:

-```
+```text
 logit = kv_overlap_score_weight × potential_prefill_blocks + potential_active_blocks
-```
+```

…and similarly for the metric-logging example a few lines below.

Also applies to: 122-124


76-76: Parameter name is inconsistent (kv_overlap_score_weight vs kv-overlap-score-weight)

Line 76 uses snake-case (kv_overlap_score_weight) while the surrounding sections and CLI flag examples use kebab-case (--kv-overlap-score-weight). Pick one style (ideally the exact CLI flag) and update all occurrences to avoid confusion.

Also applies to: 85-85

📜 Review details

Configuration used: .coderabbit.yaml
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 0cb01b3 and 19d7fc9.

📒 Files selected for processing (2)
  • docs/components/router/README.md (1 hunks)
  • docs/guides/kv_router_perf_tuning.md (0 hunks)
💤 Files with no reviewable changes (1)
  • docs/guides/kv_router_perf_tuning.md
🧰 Additional context used
🧠 Learnings (2)
📓 Common learnings
Learnt from: PeaBrane
PR: ai-dynamo/dynamo#1285
File: lib/llm/src/kv_router/scheduler.rs:260-266
Timestamp: 2025-05-30T06:34:12.785Z
Learning: In the KV router scheduler code, PeaBrane prefers fail-fast behavior over silent failure handling. When accessing worker metrics data that could be out-of-bounds (like dp_rank indexing), explicit panics are preferred over graceful degradation with continue statements to ensure data integrity issues are caught early.
docs/components/router/README.md (1)

Learnt from: PeaBrane
PR: #1285
File: lib/llm/src/kv_router/scheduler.rs:260-266
Timestamp: 2025-05-30T06:34:12.785Z
Learning: In the KV router scheduler code, PeaBrane prefers fail-fast behavior over silent failure handling. When accessing worker metrics data that could be out-of-bounds (like dp_rank indexing), explicit panics are preferred over graceful degradation with continue statements to ensure data integrity issues are caught early.

🪛 markdownlint-cli2 (0.17.2)
docs/components/router/README.md

75-75: Fenced code blocks should have a language specified

(MD040, fenced-code-language)


122-122: Fenced code blocks should have a language specified

(MD040, fenced-code-language)

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (1)
  • GitHub Check: Build and Test - vllm

@PeaBrane PeaBrane enabled auto-merge (squash) July 28, 2025 20:05
@PeaBrane PeaBrane merged commit 096d117 into main Jul 28, 2025
12 of 13 checks passed
@PeaBrane PeaBrane deleted the rupei/router-docs branch July 28, 2025 20:49
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3 participants