683 COUNTR TMPC PASS SDEL ; write descriptor to cache
This overhead is mandated by the spec's reliance on promises for buffer management, completion, and backpressure signals. While some of it is implementation-specific, much of it is unavoidable if you're following the spec as written. For high-frequency streaming – video frames, network packets, real-time data – this overhead is significant.
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停产 CCD 相机再翻红，涨价达数倍
And what software?