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Intel QAT Accelerators Being Demoted On Linux By FSCRYPT: Bug Prone & Slow
Intel's accelerator efforts in recent generations of Xeon processors have been challenging to say the least
From limited software support and configuration obstacles to some current-generation accelerators not being safe for VM use due to security issues to having to deal with higher latency and other nuances if wanting to achieve decent performance. Google engineer Eric Biggers basically found the accelerators like QAT with Xeon Emerald Rapids to be a big headache for FSCRYPT file encryption and the performance to be much worse than the AVX-512 VAES optimized code path. In the context of FSCRYPT, using QAT accelerators leads to horrible performance that even the plain C code can outpace but that the AVX-512 VAES path puts everything else to shame on Intel Xeon Emerald Rapids:
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