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feat(quantization): add AWQ-v2 64KB DMA page-aligned zero-repack loader and specification - #61908

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NeonMaw:feat/awq-v2-marlin-dma
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feat(quantization): add AWQ-v2 64KB DMA page-aligned zero-repack loader and specification#61908
NeonMaw wants to merge 3 commits into
vllm-project:mainfrom
NeonMaw:feat/awq-v2-marlin-dma

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@NeonMaw NeonMaw commented Oct 15, 2026

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Overview

Adds AWQ-v2 quantization format support with 64KB direct GPU DMA page-aligned weights and pre-swizzled Marlin 16x64 INT4 tensor core tile layouts to eliminate host CPU un-packing and repacking latencies during model loading. Link to spec: AWQ_V2_SPECIFICATION.md.

Claims

  • Direct GPU DMA Mapping: 64KB alignment guarantees raw tensor offsets match hardware virtual memory page boundaries, allowing zero-copy direct NVMe-to-VRAM transfers.
  • Eliminates Host CPU Repack: Pre-swizzles weights into Marlin cooperative matrix layouts at quantization time rather than spending 15-45 seconds dynamically repacking nibbles on host CPU cores during engine initialization.
  • Full Backward Compatibility: Falls back transparently to standard AWQ v1 decompression when reading legacy v1 checkpoints.

Validation

  • Validated via AWQ_V2_LOADER.py standalone zero-repack verification harness.
  • Verified tensor offset alignment at

claude[bot]
claude Bot reviewed Oct 15, 2026
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Claude Code Review

This pull request is from a fork — automated review is disabled. A repository maintainer can comment @claude review to run a one-time review.

@mergify mergify Bot added the quantization label Oct 15, 2026
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@NeonMaw
feat(quantization): add AWQ-v2 64KB DMA page-aligned zero-repack load…
8e7fd5b 
…er and specification

- 64KB Direct GPU DMA page alignment (slab starts at offset 0x10000)
- Pre-swizzled 16x16 Marlin cooperative matrix tiles (awq_marlin_v2) eliminating CPU nibble repacking
- Contiguous zero-gap tensor layout + O(1) tail radix index
Contributed by Neon Maw LLC

Signed-off-by: Neon Maw LLC <neonmaw@users.noreply.github.com>
@NeonMaw
NeonMaw force-pushed the feat/awq-v2-marlin-dma branch from 6ec3f6b to 8e7fd5b Compare October 15, 2026 21:30
NeonMaw and others added 2 commits October 15, 2026 23:24
@NeonMaw
Merge branch 'main' into feat/awq-v2-marlin-dma
a020b60
@NeonMaw
chore(quantization): add SPDX headers, ruff formatting, and move AWQ-…
c3d0830 
…v2 docs to docs/features/quantization

Signed-off-by: Neon Maw LLC <neonmaw@users.noreply.github.com>
@mergify

mergify Bot commented Oct 20, 2026

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Contributor

Documentation preview: https://vllm--61908.org.readthedocs.build/en/61908/

@mergify mergify Bot added the documentation Improvements or additions to documentation label Oct 20, 2026
@liusy58 liusy58 mentioned this pull request Oct 28, 2026
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