Upsize EDM Fabric Buffer Slot Size To Improver Perf for Workloads Using bfp8

[SeanNijjar]

Ticket

Link to Github Issue

Problem description

The current default EDM buffer slot size is 4096 which can only store 3 bfp8 tiles. There is enough space in erisc L1 unreserved space such that all channels can have a power of 2 buffer slot count and also have a slot size of 4 bfp8 tiles. There is inefficient space for 5 bfp8 tiles per slot.

What's changed

This PR bumps up the buffer slot size to fit 4 bfp8 tiles per packet, which is preferable for workloads with bfp8 tiles sent over fabric.

Checklist

• All post commit CI: https://github.com/tenstorrent/tt-metal/actions/runs/13405185820
• T3K: https://github.com/tenstorrent/tt-metal/actions/runs/13405190463
  • Same failure pattern as on main
• TG: https://github.com/tenstorrent/tt-metal/actions/runs/13405193031
• Blackhole Post commit CI passes (if applicable)
• Model regression CI passes (if applicable)
• Device performance regression CI passes (if applicable)
• (For models and ops writers) Full new models tests CI passes (if applicable)
• New/Existing tests provide coverage for changes

[SeanNijjar]

wrong branch