Messages in this thread | | | From | "Jason A. Donenfeld" <> | Date | Thu, 13 Oct 2022 19:26:47 -0600 | Subject | Re: [PATCH v2 09/19] crypto: x86 - use common macro for FPU limit |
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On Thu, Oct 13, 2022 at 3:48 PM Elliott, Robert (Servers) <elliott@hpe.com> wrote: > Perhaps we should declare a time goal like "30 us," measure the actual > speed of each algorithm with a tcrypt speed test, and calculate the > nominal value assuming some slow x86 CPU core speed?
Sure, pick something reasonable with good margin for a reasonable CPU. It doesn't have to be perfect, but just vaguely right for supported hardware.
> That could be further adjusted at run-time based on the supposed > minimum CPU frequency (e.g., as reported in > /sys/devices/system/cpu/cpufreq/policy0/scaling_min_freq).
Oh no, please no. Not another runtime knob. That also will make the loop less efficient.
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