I thought that someone might be interested to know more about the parallel (bitslice) mode and how that works )īasically the parallel mode also known as parallel bitslice () is a technique that uses SIMD instructions and 128 bit SSE registers to achieve parallel decryption of up to 128 buffers simultaneously. I'm very happy with the results so far, hopefully that figures can be improved, but at least I'm moving in the right direction, I think ) What's interesting is, (a part from the CPU load being nearly half), the fact that the current plugin uses 22% of the total CPU using three cores, whilst the new plugin uses only 12% of the total CPU but with two cores, which means that over three cores it would be even less. The CPU usage on the left is the current version (single algorithm) and on the right the new version (parallel algorithm). The second donor sent me a screen grab (in attachment) with the CPU usage when recording 4 HD streams simultaneously. With 2 HD recordings the CPU usage dropped from ~80% down to ~22%. With 1 HD recording the CPU usage dropped from ~40% down to ~15%. The first donor replied with quite interesting figures: I've completed part of it and given a preliminary build to two project's donor for evaluation. My main motivation on doing this is mainly because of my old SageTV server that cannot decrypt more than two HD streams without maxing out the CPU and generally speaking, less power the better ) As anticipated, I'm working at implementing the parallel decryption algorithm into the filter and the first results are very encouraging.

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