From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 945151DA4D for ; Thu, 25 Jul 2024 13:47:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721915281; cv=none; b=gC9vZtN6gZaJ9NBZzjpDfhfNHRMQZvoeuYLVNbXR+duA6Osfu42pwfsQJ5C8Y0c4Bzv+jqUa8Q/JrEPNtUnwucRJlMqNrcQvHq41A5ERJI/9BCZLtCzh6M1fHfwx1YfttUnTvQzuEBgtDrFndZbOa4BupEQ6wxTqrIKHt1CcUoc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721915281; c=relaxed/simple; bh=Wm8ilx4x4Erxx+u78DJk8dIS71vA0lZ1xbLwcWlLjhc=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=lk0AW8BiriSmTH5cbfBYBhQJY/TWDsEyfmQyypve4VRr4XG00UlhBwAlNG3/gZqLtsrPbpNqoTMJOny/9cskE2Ui12gGLWnL5SXi2mo4MCmNeSxcOx/eM7lTbJjTN036fCYMLFzdbBLueMCtmS/q/qgyb94hssOUfWvvDH3qx9U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=F726falk; arc=none smtp.client-ip=90.155.92.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="F726falk" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=Wm8ilx4x4Erxx+u78DJk8dIS71vA0lZ1xbLwcWlLjhc=; b=F726falkCUxKnITcG+hmWz3D9B M0PT/XRjMhC3LyqqnJGeFSzL+mOSTw0V7nrvRhQi3iPH/BLMYHCJMBZByGbviT1XtgkSq7MIl2OCa 1lJck2g3lbiZ1ChFePZorKhNgr/odagUczbDVs2SOEIclmAQnim1U02W66gXx4ruCRMX210F7DKki C8EE6PP3zN6JgDGlHm+5I/OqYBl8xHM4QM7tRPe+7PGUDabebRiC1k/8aXzcialFBVv6JKbKOPeMt I4c+R2tt67YdiznX2fyTwEzSvvO2EtC5Mq3PEjEPW9nhOFyuAK/tMl1BZ33511yt52YmqmoVGtqR5 ws9uTKRA==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sWyop-000000041p1-3Sq3; Thu, 25 Jul 2024 13:47:46 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id A0C9630037B; Thu, 25 Jul 2024 15:47:42 +0200 (CEST) Date: Thu, 25 Jul 2024 15:47:42 +0200 From: Peter Zijlstra To: Petr Mladek Cc: Linus Torvalds , John Ogness , Sergey Senozhatsky , Steven Rostedt , Andy Shevchenko , Rasmus Villemoes , Sebastian Andrzej Siewior , Thomas Gleixner , Jan Kara , linux-kernel@vger.kernel.org Subject: Re: [GIT PULL] printk for 6.11 Message-ID: <20240725134742.GG13387@noisy.programming.kicks-ass.net> References: <87ed7jvo2c.fsf@jogness.linutronix.de> <20240724124743.GC13387@noisy.programming.kicks-ass.net> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Thu, Jul 25, 2024 at 02:51:57PM +0200, Petr Mladek wrote: > I am afraid that we have to live with some buffering. Otherwhise, > the speed of the system might be limited by the speed of the consoles. > This might be especially noticeable during boot when a lot of HW > gets initialized and tons of messages are flushed to a slow serial console. Only if you create a slow atomic console. But other than that, I've been booting like that for at least the last decade or so. Most all my test boxes have forced synchronous earlyprintk at 115200 baud. It has saved me untold times. I suppose I'll just keep my own printk hackery around for longer.