On Mon, Mar 29, 2021 at 9:35 AM Pierre FICHEUX <pierre.fich...@smile.fr> wrote:
> 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 > > Looks like this is affecting 4.19/5.4 arm and arm64. Still investigating, hopefully I'll have a root cause shortly. -Greg
