Why would I want to not check the error? ron
On Tue, Mar 29, 2016 at 2:57 PM Dan Cross <[email protected]> wrote: > Oh.... Well, here's another patch. :-) > > On Tue, Mar 29, 2016 at 5:55 PM, ron minnich <[email protected]> wrote: > >> I was only kidding anyway. I included it as another target :-) >> >> >> On Tue, Mar 29, 2016 at 2:48 PM Dan Cross <[email protected]> wrote: >> >>> Don't include that part, then; the rdtsc and rdtscp changes are what you >>> want. >>> >>> On Tue, Mar 29, 2016 at 5:46 PM, ron minnich <[email protected]> wrote: >>> >>>> but this was not what we want :-) >>>> >>>> x86_64-ucb-akaros-gcc -Ofast -mfxsr -mxsave -mxsaveopt -o >>>> fputest fputest.c >>>> >>>> On Tue, Mar 29, 2016 at 2:42 PM Dan Cross <[email protected]> wrote: >>>> >>>>> FYI, please see attached patch. >>>>> >>>>> On Mon, Mar 28, 2016 at 6:32 PM, ron minnich <[email protected]> >>>>> wrote: >>>>> >>>>>> The timing is per-operation, not per total run. Even if we get one >>>>>> timer interrupt in there, it's going to be one bad data point. I'm fine >>>>>> with that. >>>>>> >>>>>> But, me, i'm only taking 128 samples. I think that's more the enough >>>>>> and it runs in maybe several dozen microseconds. >>>>>> >>>>>> ron >>>>>> >>>>>> On Mon, Mar 28, 2016 at 3:29 PM ron minnich <[email protected]> >>>>>> wrote: >>>>>> >>>>>>> I'm still testing on linux. Akaros comes later :-) >>>>>>> >>>>>>> On Mon, Mar 28, 2016 at 2:59 PM Barret Rhoden <[email protected]> >>>>>>> wrote: >>>>>>> >>>>>>>> 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 >>>>>>>> >>>>>>>> -- >>>>>>>> You received this message because you are subscribed to the Google >>>>>>>> Groups "Akaros" group. >>>>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>>>> send an email to [email protected]. >>>>>>>> To post to this group, send email to [email protected]. >>>>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>>>> >>>>>>> -- >>>>>> You received this message because you are subscribed to the Google >>>>>> Groups "Akaros" group. >>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>> send an email to [email protected]. >>>>>> To post to this group, send email to [email protected]. >>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>> >>>>> >>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "Akaros" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>> an email to [email protected]. >>>>> To post to this group, send email to [email protected]. >>>>> For more options, visit https://groups.google.com/d/optout. >>>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "Akaros" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> To post to this group, send email to [email protected]. >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Akaros" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To post to this group, send email to [email protected]. >>> For more options, visit https://groups.google.com/d/optout. >>> >> -- >> You received this message because you are subscribed to the Google Groups >> "Akaros" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> For more options, visit https://groups.google.com/d/optout. >> > > -- > You received this message because you are subscribed to the Google Groups > "Akaros" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Akaros" group. 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