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[147.75.48.161]) by mx.google.com with ESMTPS id d2e1a72fcca58-6f4d2a9208fsi22407378b3a.96.2024.05.20.08.37.59 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 May 2024 08:38:00 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel+bounces-183913-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.48.161 as permitted sender) client-ip=147.75.48.161; Authentication-Results: mx.google.com; arc=pass (i=1 spf=pass spfdomain=lst.de); spf=pass (google.com: domain of linux-kernel+bounces-183913-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.48.161 as permitted sender) smtp.mailfrom="linux-kernel+bounces-183913-linux.lists.archive=gmail.com@vger.kernel.org" Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sy.mirrors.kernel.org (Postfix) with ESMTPS id 47605B21289 for ; Mon, 20 May 2024 15:37:57 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 5478313774A; Mon, 20 May 2024 15:37:50 +0000 (UTC) Received: from verein.lst.de (verein.lst.de [213.95.11.211]) (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 D9EA4FC01 for ; Mon, 20 May 2024 15:37:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.95.11.211 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716219469; cv=none; b=Ya71KW1g0rJZNVEtZpGR0pznShrYHu95EGjIBKNAJaq/5LP1GukME5SR0YW/HBbj4LdqWoNCmn5VxgkBL7MuclWo4cv+3lZHjopapgDDeuef5qyBoT8y/aqXVEObzYkBUwt9xQWorNcUoS8CC+vNkW1NunT2HimDPXZ5vTaXZ64= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716219469; c=relaxed/simple; bh=kxLV30ZR/FR45/xibVzF3X5JUn/83gl0e2qbK+KR8OE=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=N6HbzyZg28FTvjghgBmk5+B3T7nTC6QYEkLb8hwQ5LiYnA4zVfRmQyXJkL/qHq557LWZcsNd1YgGaguMGYmruv20TZK/MIZQDr7STwAOX/aWVhQTJzgBh4pO91axADgKb8+lI4mcda38ndDIipxyhgkHB265gPOl0NfsAXG2q/s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de; spf=pass smtp.mailfrom=lst.de; arc=none smtp.client-ip=213.95.11.211 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=lst.de Received: by verein.lst.de (Postfix, from userid 2407) id 595D368BFE; Mon, 20 May 2024 17:37:43 +0200 (CEST) Date: Mon, 20 May 2024 17:37:42 +0200 From: Christoph Hellwig To: Thomas Gleixner Cc: Keith Busch , Ming Lei , Christoph Hellwig , Keith Busch , linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 2/2] nvme-pci: allow unmanaged interrupts Message-ID: <20240520153742.GB921@lst.de> References: <20240510141459.3207725-1-kbusch@meta.com> <20240510141459.3207725-2-kbusch@meta.com> <20240510151047.GA10486@lst.de> <87r0e7mt9w.ffs@tglx> 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: <87r0e7mt9w.ffs@tglx> User-Agent: Mutt/1.5.17 (2007-11-01) On Sun, May 12, 2024 at 08:35:55AM +0200, Thomas Gleixner wrote: > That's expected as you pin the I/O operation on the isolated CPUs which > in turn makes them use the per CPU queue. > > The isolated CPUs are only excluded for device management interrupts, > but not for the affinity spread of the queues. We'll probably need a version of isolcpus that also excludes the interrupt spread given that users are asking for it. And I'd much prefer that over adding radom module options to every driver to disable managed interrupts.