On Fri, Dec 18, 2020 at 01:10:57PM -0800, Megha Dey wrote: > Optimize crypto algorithms using VPCLMULQDQ and VAES AVX512 instructions > (first implemented on Intel's Icelake client and Xeon CPUs). > > These algorithms take advantage of the AVX512 registers to keep the CPU > busy and increase memory bandwidth utilization. They provide substantial > (2-10x) improvements over existing crypto algorithms when update data size > is greater than 128 bytes and do not have any significant impact when used > on small amounts of data. > > However, these algorithms may also incur a frequency penalty and cause > collateral damage to other workloads running on the same core(co-scheduled > threads). These frequency drops are also known as bin drops where 1 bin > drop is around 100MHz. With the SpecCPU and ffmpeg benchmark, a 0-1 bin > drop(0-100MHz) is observed on Icelake desktop and 0-2 bin drops (0-200Mhz) > are observed on the Icelake server. > Do these new algorithms all pass the self-tests, including the fuzz tests that are enabled when CONFIG_CRYPTO_MANAGER_EXTRA_TESTS=y? - Eric
