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 C6336C25B10 for ; Mon, 13 May 2024 13:13:04 +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:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=CK/yTD4vsBE25iZLNTjIJQVNn6zNelLGLfVBPKfwaCQ=; b=mc2hIGdStXjng8caghSdyotLJe gy2yxbvdrs+JIfS15GzehNoH1FKt/cdC4l3qX9xjS0AI1+Kf/6UKPIvY3hgyD1HcucP4XYCqd+uB8 e6wQbx409dbj85pUpWXCi3rJdM9UzG2i9/taf9ujRhm/ALb7b4xHUenoVLWZHPJJz+rtwv3rlWB3o 3/uFPGTXVX85InLrVajyJClwHmVDK6gCGDmxb7nywZBvrbaF77CEFNyFeZoRBwEwdXKikfvqJNVAF T70OW4Qaciu1Cb3Ilr1jZtfD0cY6TI01qEzC+zNgrJnRvak6b8T1chTrmisq5iuGXA41aIpxsL6YD 5rSCgX3A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1s6VUE-0000000CxNM-2LGE; Mon, 13 May 2024 13:13:02 +0000 Received: from 009.lax.mailroute.net ([199.89.1.12]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1s6VUA-0000000CxJr-2VZH for linux-nvme@lists.infradead.org; Mon, 13 May 2024 13:13:00 +0000 Received: from localhost (localhost [127.0.0.1]) by 009.lax.mailroute.net (Postfix) with ESMTP id 4VdKfR2Dh3zlgVnf; Mon, 13 May 2024 13:12:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=acm.org; h= content-transfer-encoding:content-type:content-type:in-reply-to :from:from:content-language:references:subject:subject :user-agent:mime-version:date:date:message-id:received:received; s=mr01; t=1715605964; x=1718197965; bh=CK/yTD4vsBE25iZLNTjIJQVN n6zNelLGLfVBPKfwaCQ=; b=apbCsBl00eKoh96TCJA+4gFfsHjvC2MCRzFnHNjt igYlO5msrwPg+wC8vWf1qPY/DOiw9OJ4Ky2aBN6iQ8/DCmz939vm4E0beYyLgbbX 0qRe61nDogYk5RF/Y9zTLl8X1WwMjAC7z7WaF/Vshag1ytEjhbot0pJ+8/y0qCZ0 S3/lr4lbr34hCcqJEIJNMv2f6C/or7FAFe9/q8n7JkknryhXufZdPyqFekY1u8CU DE+xlyblECb+NRNCPeBAKvAAPI4BbzsAOMBOa84Z7OJhwEuYHkB/llQubhJCys7Q ya4MzBzUFU5tdoxJyzCwQNtaAV1bzPN6Fcx3OHmauIuKzA== X-Virus-Scanned: by MailRoute Received: from 009.lax.mailroute.net ([127.0.0.1]) by localhost (009.lax [127.0.0.1]) (mroute_mailscanner, port 10029) with LMTP id oJpwUKMiAjg5; Mon, 13 May 2024 13:12:44 +0000 (UTC) Received: from [172.20.0.79] (unknown [8.9.45.205]) (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) (Authenticated sender: bvanassche@acm.org) by 009.lax.mailroute.net (Postfix) with ESMTPSA id 4VdKfM5rYNzlgVnW; Mon, 13 May 2024 13:12:43 +0000 (UTC) Message-ID: Date: Mon, 13 May 2024 07:12:42 -0600 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/2] nvme-pci: allow unmanaged interrupts To: Christoph Hellwig , Keith Busch Cc: linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org, tglx@linutronix.de, ming.lei@redhat.com, Keith Busch References: <20240510141459.3207725-1-kbusch@meta.com> <20240510141459.3207725-2-kbusch@meta.com> <20240510151047.GA10486@lst.de> Content-Language: en-US From: Bart Van Assche In-Reply-To: <20240510151047.GA10486@lst.de> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240513_061258_732515_50A9D503 X-CRM114-Status: GOOD ( 11.17 ) 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 5/10/24 08:10, Christoph Hellwig wrote: > On Fri, May 10, 2024 at 07:14:59AM -0700, Keith Busch wrote: >> From: Keith Busch >> >> Some people _really_ want to control their interrupt affinity. > > So let them argue why. I'd rather have a really, really, really > good argument for this crap, and I'd like to hear it from the horses > mouth. Performance can be increased by modifying the interrupt assignments carefully, especially in storage appliances that have to process a large number of network and storage interrupts. By carefully assigning interrupts the number of completions processed per interrupt can be increased and hence performance also increases. In 2014 I was working on a product that benefited from this approach. Thanks, Bart.