On Mon, Mar 29, 2021 at 5:22 AM Pierre FICHEUX via Xenomai < [email protected]> wrote:
> I mean Arm64 AND 5.x is recent ! > > Le lun. 29 mars 2021 à 11:20, Pierre FICHEUX <[email protected]> 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 -\- [email protected] > > 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 -\- [email protected] > 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
