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thermal: Adjust T6 thermal model#2435

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thermal: Adjust T6 thermal model#2435
hawkw wants to merge 1 commit intomasterfrom
eliza/adjust-t6-thermals

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@hawkw hawkw commented Mar 12, 2026

Our current thermal model for the T6, which sets a target temperature of 70° C, a critical threshold of 80° C, and a power-down threshold of 85° C, is extremely conservative. According to Chelsio, the Tj Typical for the part is 100° C, so we are running with thermal parameters that will shut down the whole system long before the part even reaches the vendor's typical temperature. While I imagine that keeping the T6 well below Tj Typical is probably good for the long-term reliability of the part, the thermal loop is far too twitchy about powering down the whole system if the T6 gets a bit hot, so we can afford to be less careful with it.

This commit updates the thermal mdoel for T6 to set the target temperature to 95° C, the critical threshold to 100° C, and the power-down threshold to 115° C (which is Chelsio's Tj Max value for the part). This is still a bit more conservative than setting the target temperature to 100° C, but I feel like we can afford to be a bit conservative, if it improves long-term reliability --- this still gives us 25° C of additional headroom before the thermal loop gets scared, relative to the old thermal model.

Closes #2431

Our current thermal model for the T6, which sets a target temperature of
70° C, a critical threshold of 80° C, and a power-down threshold of 85°
C, is _extremely_ conservative. According to Chelsio, the T<sub>j</sub>
Typical for the part is 100° C, so we are running with thermal
parameters that will shut down the whole system long before the part
even reaches the vendor's typical temperature. While I imagine that
keeping the T6 well below T<sub>j</sub> Typical is probably good for the
long-term reliability of the part, the thermal loop is far too twitchy
about powering down the whole system if the T6 gets a bit hot, so we can
afford to be less careful with it.

This commit updates the thermal mdoel for T6 to set the target
temperature to 95° C, the critical threshold to 100° C, and the
power-down threshold to 115° C (which is Chelsio's T<sub>j</sub> Max
value for the part). This is still a bit more conservative than setting
the target temperature to 100° C, but I feel like we can afford to be a
bit conservative, if it improves long-term reliability --- this still
gives us 25° C of additional headroom before the thermal loop gets
scared, relative to the old thermal model.

Closes #2431
@hawkw hawkw requested review from mkeeter and rmustacc March 12, 2026 17:14
@hawkw hawkw marked this pull request as ready for review March 12, 2026 17:14
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Adjust T6 thermal model

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