From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.17\)) Subject: Re: [I-PIPE][ARM64] Experimenting on Jetson Xavier From: =?utf-8?Q?Deniz_U=C4=9Fur?= In-Reply-To: <652D6B1D-CE11-4C5B-93E5-0D02B07ABC35@gmail.com> Date: Mon, 22 Feb 2021 10:01:22 +0300 Content-Transfer-Encoding: quoted-printable Message-Id: References: <87a6rx4c6k.fsf@xenomai.org> <34573B47-B373-46DB-A49D-FB6298AA65DC@gmail.com> <871rd947az.fsf@xenomai.org> <652D6B1D-CE11-4C5B-93E5-0D02B07ABC35@gmail.com> List-Id: Discussions about the Xenomai project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Philippe Gerum Cc: Xenomai Okay so, isolcpus=3D0 did not isolated the CPU#0 but isolcpus=3D1 worked on CPU#1, and that isolated CPU#1 (confirmed by task set -cp 1). I don=E2=80=99t know why but I got the isolation working so its not a = problem which core gets isolated. After the isolation, the results are remarkable. No stress min: ~0.1us avg: ~0.1us max: 5-20us Hectic stress min: ~5us avg: ~6us max: 15-20us (worst is 41us) > On 22 Feb 2021, at 00:44, Deniz U=C4=9Fur wrote: >=20 > Hi again, >=20 > So I=E2=80=99ve installed the evl/v5.10 on Jetson Xavier and after = setting the scaling_governor to performance I got somewhat good results. >=20 > I=E2=80=99ve set the isolcpus=3D0 command line argument but latmus = reports that CPU0 is not isolated. I=E2=80=99m not sure if that=E2=80=99s = a bug or I=E2=80=99ve missed something. >=20 > Other than that I=E2=80=99m getting latencies between +-10us and worst = latency is 73us. Even though I=E2=80=99ve ran latmus -t I=E2=80=99m = still getting negative latencies. Isn=E2=80=99t that supposed to fix = that? >=20 > evl test reports OK for everything except for scheduler-quota-accuracy = and sched-tp-accuracy (no kernel support) >=20 > Are these latencies best I can get or are there anything else I can do = to lower/stabilize the latencies? >=20 > Thanks. > Deniz. >=20 >> On 21 Feb 2021, at 21:14, Philippe Gerum wrote: >>=20 >>=20 >> Deniz U=C4=9Fur writes: >>=20 >>> Hi Philippe, >>>=20 >>> Thank you for your reply. It=E2=80=99s so good to hear that Xenomai = is evolving. >>> Really appreciate the work you guys are doing. >>>=20 >>> I would suggest to try booting the Jetson with [3] first, >>> reporting any issue to this list so we can fix them >>>=20 >>> I will try this ASAP and report my results under this thread. >>> I will be eagerly waiting for the arm64 version of Dovetail :) >>>=20 >>=20 >> Actually, Dovetail/arm64 has been alive and kicking for several years >> now, EVL runs it today up to the latest v5.11. What is missing is the >> Xenomai port to Dovetail/arm64, which is brewing. I'll keep you = posted >> when it can be tested (within a week, I believe). >>=20 >> --=20 >> Philippe. >=20