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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 6FDB1C25B79 for ; Tue, 21 May 2024 02:32:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Un8QUR/OoDAegeOGSZU2tmkAkH/Qfnn42zoBkjHSFWQ=; b=lVkEhOvlOBL7IvADNaP4Gk/eAe 4TAn/t5dOCTlDADOw30TysUul8yVVBnTuTwJZT0anxceF8B0bWO+HO46MF+02lVOTEIDbqkyb5VBp etdVG94Xs4mBC1gkOQZeL9T1zOf16fwTfe5hutGg7+aaJ2nZgTkPIum6f3I/W3oeJCJoLJJUULHys zdP7bM7zUblEwpwHZJ+ddLr+1D9TAl/DaVYqsjLiVtsfElOcseslJvCUh9e2cqAnq1ON/zLND3NV2 3oN3be0tF1cm68DlA0fbKV1f4yGWRAsPpMlvG9gMqLdpeazVSmRX+nl5T/Rb3L2dUNbABPD9lmUkg FFo/I9tQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1s9FIZ-0000000G4EG-0dUv; Tue, 21 May 2024 02:32:19 +0000 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1s9FIW-0000000G4Do-1NUq for linux-nvme@lists.infradead.org; Tue, 21 May 2024 02:32:17 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1716258734; 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=Un8QUR/OoDAegeOGSZU2tmkAkH/Qfnn42zoBkjHSFWQ=; b=Gf5PrZGoWX6X/nkX0tv8r7JgdUx65eyQd6v2S03HVsCLbvjDHCXaYhwe74m0qYhpeM43FB 4hTUK3QuTF8tQ7v3LSBKhsQG6oIfXN85hrB+OEQVHXKdiL+mkfZCeHTEnIek8vm+wDHfsW pdmCaWgTbXtJEkQR8lY3UQG63BbTiBA= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-182-jxA6zLjfPNq6lOlyTHTqrw-1; Mon, 20 May 2024 22:32:10 -0400 X-MC-Unique: jxA6zLjfPNq6lOlyTHTqrw-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 0C6CA29AA39D; Tue, 21 May 2024 02:32:10 +0000 (UTC) Received: from fedora (unknown [10.72.116.24]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 91A8D100B0C0; Tue, 21 May 2024 02:32:04 +0000 (UTC) Date: Tue, 21 May 2024 10:31:59 +0800 From: Ming Lei To: Christoph Hellwig Cc: Thomas Gleixner , Keith Busch , Keith Busch , linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 2/2] nvme-pci: allow unmanaged interrupts Message-ID: References: <20240510141459.3207725-1-kbusch@meta.com> <20240510141459.3207725-2-kbusch@meta.com> <20240510151047.GA10486@lst.de> <87r0e7mt9w.ffs@tglx> <20240520153742.GB921@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240520153742.GB921@lst.de> X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.3 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240520_193216_460068_EC54886B X-CRM114-Status: GOOD ( 16.78 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On Mon, May 20, 2024 at 05:37:42PM +0200, Christoph Hellwig wrote: > 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. BTW, isolcpus has been marked as deprecated, and it can't be adjust runtime. isolcpus= [KNL,SMP,ISOL] Isolate a given set of CPUs from disturbance. [Deprecated - use cpusets instead] Thanks, Ming