From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 733D22528F5; Mon, 10 Feb 2025 17:27:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739208421; cv=none; b=JJg4aiQJLtB/GTKmPdNogXC6EN1WRF1Fzr86bJW3AWZnAV42rG/gH/Q6h02P8rIuFcphSmZXiuCVJkslh9bmr9J5fSCkAwYLhtMOCJ0Mjw0LVvXZVDpfbADQY/OqYtz/lRbvrONnOolykD2lLBQZ+CplohJ7moQBy5laqBIf/FU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739208421; c=relaxed/simple; bh=Fjs6+0Zf5mgVOYTBzxjcDWilgXuouqf7lljec52hdZw=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=pOjALRWVcgj158NOLAqKxI1yAPjiGOIh6dz1gf5iwfaUyja6xU74MrK3VRmZWbYfQLzWwm56i9CoPMZtSjJ+m7yTwwr6xyer/GVB0b/RVCsdZfwhHrciCFQ7JO6Q9QFA6KQT+bHpdsuwds1SBWu+7+cVTdw7VpgCaVuk8x9lVOE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 Received: by smtp.kernel.org (Postfix) with ESMTPSA id 43BB8C4CEE6; Mon, 10 Feb 2025 17:26:57 +0000 (UTC) Date: Mon, 10 Feb 2025 12:27:00 -0500 From: Steven Rostedt To: David Laight Cc: Joel Fernandes , Prakash Sangappa , Peter Zijlstra , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Thomas Gleixner , Ankur Arora , Linus Torvalds , linux-mm@kvack.org, x86@kernel.org, Andrew Morton , luto@kernel.org, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, willy@infradead.org, mgorman@suse.de, jon.grimm@amd.com, bharata@amd.com, raghavendra.kt@amd.com, Boris Ostrovsky , Konrad Wilk , jgross@suse.com, Andrew.Cooper3@citrix.com, Vineeth Pillai , Suleiman Souhlal , Ingo Molnar , Mathieu Desnoyers , Clark Williams , bigeasy@linutronix.de, daniel.wagner@suse.com, Joseph Salisbury , broonie@gmail.com Subject: Re: [RFC][PATCH 1/2] sched: Extended scheduler time slice Message-ID: <20250210122700.3b963ff0@gandalf.local.home> In-Reply-To: <20250210172059.07cda916@pumpkin> References: <9DA1FAE6-A008-4785-BDF9-541457E29807@joelfernandes.org> <20250204220418.35949317@gandalf.local.home> <20250205081635.397eacb0@gandalf.local.home> <20250206083039.0916ad24@gandalf.local.home> <20250210172059.07cda916@pumpkin> X-Mailer: Claws Mail 3.20.0git84 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Mon, 10 Feb 2025 17:20:59 +0000 David Laight wrote: > Hmmm... you lose big-time anyway. > > All you need is a lot of network traffic 'pinch' the process context until > the hardware interrupt, NAPI softint code and rcu softint code completes. > That can easily take several milliseconds. Not on PREEMPT_RT. All that runs as threads. And this is a feature that we would like on RT for non RT tasks. -- Steve