Thx a lot ! Le lun. 29 mars 2021 à 15:17, Greg Gallagher <g...@embeddedgreg.com> a écrit :
> > > On Mon, Mar 29, 2021 at 8:06 AM Pierre FICHEUX <pierre.fich...@smile.fr> > wrote: > >> Hi Greg, >> >> Thks for the answer, so you're currently tracking the problem? >> >> Le lun. 29 mars 2021 à 13:43, Greg Gallagher <g...@embeddedgreg.com> a >> écrit : >> >>> >>> >>> On Mon, Mar 29, 2021 at 5:22 AM Pierre FICHEUX via Xenomai < >>> xenomai@xenomai.org> wrote: >>> >>>> I mean Arm64 AND 5.x is recent ! >>>> >>>> Le lun. 29 mars 2021 à 11:20, Pierre FICHEUX <pierre.fich...@smile.fr> >>>> a >>>> écrit : >>>> >>>> > Hi all, >>>> > >>>> > I’ve been using Xenomai-3.1/I-pipe for several months on Pi 3 B/B+ >>>> with >>>> > mainline kernel (4.19.128 and 4.19.144, arm). I had good results >>>> (about 30 >>>> > µs jitter) with latency + dohell (or latency + hackbench). >>>> > >>>> > Unfortunately, a new arm64 test on 5.4.72 or 5.4.107 >>>> > (ipipe-core-5.4.107-arm64-1 tag) leads to a 70 µs jitter on the same >>>> > board. >>>> > >>>> > I know I-pipe support is recent for arm64 but do you have any idea >>>> about >>>> > the problem? What are the results on other Arm64 boards such as iMX, >>>> or >>>> > OMAP ? >>>> > >>>> > >>>> > Please note, I removed the warnings about APM/ACPI/CPU freq/MIGRATION >>>> from >>>> > the kernel config. >>>> > >>>> > >>>> > Thx by advance >>>> > >>>> > >>>> > Regards >>>> > >>>> > -- >>>> > >>>> > Pierre FICHEUX -/- CTO Smile ECS, France -\- pierre.fich...@smile.fr >>>> > http://www.smile.fr >>>> > https://smile.eu/fr/offres/embarque-iot >>>> > I would love to change the world, but they won't give me the source >>>> code >>>> > >>>> > >>>> >>>> -- >>>> >>>> Pierre FICHEUX -/- CTO Smile ECS, France -\- pierre.fich...@smile.fr >>>> http://www.smile.fr >>>> https://smile.eu/fr/offres/embarque-iot >>>> I would love to change the world, but they won't give me the source code >>> >>> >>> I test with Ultra96 board and have seen higher then normal. I’m using >>> ftrace to track down the source of the latency. >>> >>> -Greg >>> >> >> >> -- >> >> Pierre FICHEUX -/- CTO Smile ECS, France -\- pierre.fich...@smile.fr >> http://www.smile.fr >> https://smile.eu/fr/offres/embarque-iot >> I would love to change the world, but they won't give me the source code >> >> Hi Pierre, > I have a hang to look at in arm64 qemu and then I’m getting back to > looking at what is causing the latency. The ultra96 is showing higher then > normal latency. > I’m hoping to have some answers by the end of the week. A updated 4.19 > release is on its way as well, but Im seeing good latency numbers with that > release. > > -Greg > >> -- Pierre FICHEUX -/- CTO Smile ECS, France -\- pierre.fich...@smile.fr http://www.smile.fr https://smile.eu/fr/offres/embarque-iot I would love to change the world, but they won't give me the source code
