On 2016-03-28 at 21:46 ron minnich <[email protected]> wrote:
> https://github.com/akaros/fputest
>
>
> We're getting there. It's now using gcc intrinsics, which hopefully
> are more correct. Still trying to get sane timing for the "no op"
> case.
i'd be concerned if the intrinsics are right and our own versions are
wrong. hopefully that won't be the case after this gets sorted out.
given that n = 1000000 and rdtsc alone takes O(30) ticks, you're
probably getting interference from the timer IRQ, even on Akaros Core 0.
here's two quick things to try:
call uthread_mcp_init() somewhere in main. that'll make you an MCP.
it's a bit hacky. verify that it's working with a ps or pip.
check your tsc overhead against __procinfo.timing_overhead or against
the console output during boot, e.g.
TSC overhead (Min: 32, Max: 36)
i didn't look at any of the actual FPU stuff for issues yet.
barret
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