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
