From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 1E3EACFA74C for ; Fri, 4 Oct 2024 06:49:57 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id A342C10E246; Fri, 4 Oct 2024 06:49:56 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; secure) header.d=linutronix.de header.i=@linutronix.de header.b="ZdrmEM93"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="EcI/VHP0"; dkim-atps=neutral Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by gabe.freedesktop.org (Postfix) with ESMTPS id D2C6810E246; Fri, 4 Oct 2024 06:49:55 +0000 (UTC) Date: Fri, 4 Oct 2024 08:49:51 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1728024593; 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: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Dq1TgVDHWXNn6/NO62mgaZz0wH4NS8DnE+Kca0Vo1sk=; b=ZdrmEM939Rmvm3zI7yAhGpx7w8VseFnbpw6n4qexy89FFbnjttKgkGtSK2DIndCMyDjogx jq7zFkT2No03YuFvlveqBP/6krJ4H7toQ9pBXjFYaanaMibUA93CewC4VPwxnp+6T6gOaf EkeForzLbwjdBoR9to4BNfhWKCnwcjCI1zR5x1lZYv3M1TedyDp+PqEGovxzGvcsSuJwaQ EKBGuSRghZRsjUqhJM8jcBDMz1jijoiGHpdfJxL3zjJcjkS//Y4O7wVaCPR2wQNMGXfvnc HqPbH3bRR5dpJEghbMMHWeI6aq8MVYrimFORAaB4mgDcAtk0tbdeuWCbFNkhRA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1728024593; 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: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Dq1TgVDHWXNn6/NO62mgaZz0wH4NS8DnE+Kca0Vo1sk=; b=EcI/VHP0ZeKhHI5sAv4gzQlAVKD7NB/I2J5zkU/XqLXEI/DrAivD7LA1KP177Pm00tyBlb cQbFJcWbqy6b48Bw== From: Sebastian Andrzej Siewior To: Ville =?utf-8?B?U3lyasOkbMOk?= Cc: intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Thomas Gleixner , Tvrtko Ursulin Subject: Re: [PATCH v3 0/8] drm/i915: PREEMPT_RT related fixups. Message-ID: <20241004064951.XLw7TFbS@linutronix.de> References: <20240628130601.1772849-1-bigeasy@linutronix.de> <20241002162543.TKbd-8g0@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable In-Reply-To: X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" On 2024-10-02 19:58:08 [+0300], Ville Syrj=C3=A4l=C3=A4 wrote: > > These patches were not picked. Did I forget something or was this just > > overseen? >=20 > This looks quite poorly justified. Eg. you seem to be now > leaving interrupts enabled (and even preemption enabled I > guess) when we're racing against the raster beam. On first > blush that seems like a recipe for failure. I can't really parse this. I may leave interrupts enabled in vblanc code (the first two patches). > First step would be to set CONFIG_DRM_I915_DEBUG_VBLANK_EVADE=3Dy, > run a bunch of tests that stress the display stuff (eg. > kms_atomic_transitions and other stuff from igt, and also > some real workloads) and probably throw in a bunch of > other load/perturbance at the system to make life hard. > After the system has been sufficiently hammered one can > compare sys/kernel/debug/dri/0/crtc-*/i915_update_info > against a baseline. Bonus points for doing it on a potato. So you have a specific test for me to run? =20 Sebastian