Re: [PATCH] wifi: ath: avoid repeated divisions in DFS PRI detector

[Jeff Johnson]

On 7/1/2026 10:04 AM, frank0988 wrote:
> pde_get_multiple() is called repeatedly with the same PRI (Pulse
> Repetition Interval) value while validating candidate and existing PRI
> sequences.
> 
> Cache the reciprocal value for each sequence structure and leverage
> reciprocal_divide() in the hot path. This keeps the existing matching
> logic and tolerance checks intact while replacing expensive hardware
> integer divisions with low-cost multiply-and-shift operations.
> 
> Testing with a userspace model of the same detector logic demonstrated
> identical detector states and outputs across 100 verification traces.
> To eliminate memory allocator noise, an isolated micro-benchmark using
> a static object pool showed that the reciprocal variant reduces CPU
> cycles by approximately 3.4%.
> 
> Signed-off-by: frank0988 <frank0988855428@xxxxxxxxx>

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