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Improve stem backpressure logic #4388

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ripatel-fd opened this issue Mar 5, 2025 · 0 comments
Open

Improve stem backpressure logic #4388

ripatel-fd opened this issue Mar 5, 2025 · 0 comments
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ripatel-fd commented Mar 5, 2025 •
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Stem currently tracks available flow control credits via a single variable cr_avail.

We noticed a couple issues with this logic:

  • Some tiles (e.g. net tile) report immense backpressure on unreliable links (which should not be able to backpressure by definition)
  • Shallow idle out links bleed backpressuring onto deep links even if there is no actual risk of flow control quota overrun
  • Backpressure on out links blocks processing of incoming fragments.
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