From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from relay6-d.mail.gandi.net (relay6-d.mail.gandi.net [217.70.183.198]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 71009279918 for ; Sun, 12 Oct 2025 14:44:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.198 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760280295; cv=none; b=f/7ysboJ4yY5gWD17iGJvqS1JaX+lQzr1xksz7WXa45ZGG24+FoOUj6Oblr+yeZCQuMoO0BxD52uHZeAW51NvGDseHmOkaBiQFkfyC8WvKZYOBLdYCYaQZ+SPSR8UAcslyizufOkSI1Gh1awyUi96s4/wdoqB/Vq31EH7oRgkpU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760280295; c=relaxed/simple; bh=p7vY3F2okgqBGqgwz33t3YtnFfkXuhmJiNU1V705zG0=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=u/wF8MpSDPQcp3Hocsim9Dm8/QTsFz7n5wbKShsI2529H7E7vyS2IwQeTTYLYuTtBq6AUpSiINyjOo8s/LO9CT7lYKavRXObAx702moVSODtEKzk3HAKeo4R5e6Ga/Ar6qojk5dQkAJzUc1FrhygEqJzbn10FrYvmNCm+TnzD4Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=xenomai.org; spf=pass smtp.mailfrom=xenomai.org; dkim=pass (2048-bit key) header.d=xenomai.org header.i=@xenomai.org header.b=g03f3Pp/; arc=none smtp.client-ip=217.70.183.198 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=xenomai.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=xenomai.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=xenomai.org header.i=@xenomai.org header.b="g03f3Pp/" Received: by mail.gandi.net (Postfix) with ESMTPSA id 2AA70442D1; Sun, 12 Oct 2025 14:44:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=xenomai.org; s=gm1; t=1760280290; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=KwLMQjREZswm+VQeOCNJM86D3FR6U4qXX1bh0WZID9A=; b=g03f3Pp/f0M9A1vDeffJYVZ9fCOMZSra+2hpC7YiJmS5lvUOIi2ogPLOzx31/hw9ec7p3j 69B0q7Hj9l9EpbP4mKuQ4JLm1WGdYaUL/EwmT2tuPyfaX+QqYDXl8ImjpIjO4l7sKvSK3g TC65GTPE5BSrAHAXscEokDbawgzGTAjpt4i5VJhRjbHAiWVlZPBTZxJxNEBF27s1lXfoBu N/W0iEOUS+aUxW6sX7G6BQlybqAPkRRVshq6NhfxbRewXfFW4KFbGSOgUy+Zh5o6aVLUYy 9nRwBsIutScQiGOqogOUekWkd/Mt4q+aNS8SEImixEGjyDDvayxdCCeV/qzVKg== From: Philippe Gerum To: Giulio Moro Cc: Xenomai Subject: Re: Unexpected switches to in-band In-Reply-To: (Giulio Moro's message of "Sat, 11 Oct 2025 14:46:56 -0500") References: <20251009151737.0d03b211@wsk> <20676160-4572-d92d-4b33-ff4255946345@bela.io> <87qzv9sa9c.fsf@xenomai.org> <87ikgls9kh.fsf@xenomai.org> <874is5s6kw.fsf@xenomai.org> User-Agent: mu4e 1.12.12; emacs 30.2 Date: Sun, 12 Oct 2025 16:44:49 +0200 Message-ID: <874is4i3ha.fsf@xenomai.org> Precedence: bulk X-Mailing-List: xenomai@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain X-GND-Sasl: rpm@xenomai.org Giulio Moro writes: >> Quick check: does "evl check" run without any output (as expected)? > > Yes > > Further update: tested v6.16-evl-rebase and it seems to have the same in-band switching issue. So far the only good one was v6.1.y-cip-evl-rebase. > >> Meanwhile, I've been trying to reproduce on x86 and armv8 (odroid c4) using the posted recipe, no luck so far. > > Thanks for giving it a try. Wanna have a look at/try my config? https://github.com/giuliomoro/linux/blob/v6.12.y-evl-rebase/.config I could not reproduce this issue yet, neither on x86 nor arm64, trying a bunch of configurations of linux-evl/v6.12.49. At this point, the best approach would be to track down the latency spot on the TI board using the 'latspot' (f)tracepoint which latmus triggers each time a new latency maximum is reached, so that we might find out the reason for taking those minor faults which are causing in-band switches. There is some documentation about its usage at [1]. [1] https://v4.xenomai.org/core/commands/index.html -- Philippe.