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 D3906E69185 for ; Fri, 22 Nov 2024 17:53:07 +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=RstFT4v1FTwGEZ6DtgUQEagwPEudbwO0pMDPcVbX3L4=; b=YIOJ7SH7m+7LBSMp3G2qlKAK+3 MnMWz4/bGen484/h8hwJo7JLqzZGW8+6cLPmU9/iJxIRk97M/uD+3AFbR2pEhf/8j+Ym/7VdCvlyT XXlLIU1ggqaXdb1CLWxdNLMpf+o37OoBIJwviaITO8Rm9n7VGXmzSnLLz7147gOZ1zkHWKF914o3e +c8iFO7Zpo/uPtD6uwqQsACPIawBZceYvwCsEFfmuaHM2Oo0pon+wRTcFobilyPTsufzFxS9GQLUF bF+Zjw+0ZswnDEcIjblhEmYkuvPYiNDpuaF+bwerJnXF8QT28Udr//mBA/61oOq5B+UyYx4Ny6E3z d4v1c9XA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tEXq6-000000032Mv-0yL5; Fri, 22 Nov 2024 17:53:06 +0000 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tEXq3-000000032MZ-2oJt for linux-nvme@lists.infradead.org; Fri, 22 Nov 2024 17:53:04 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1732297982; 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: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=RstFT4v1FTwGEZ6DtgUQEagwPEudbwO0pMDPcVbX3L4=; b=BPG1w3soi25IVBR7HJNavRnrA0O3ER8Tj+X4LKeHTmVzC6yvqk90txWuyHnTyv7ET7Uzy6 9TXnJWLRl0i/09H3HAya8UnLLhChKX9S+is9RFYR4q5/VIWoh5R5+e5AaNWz26awGWP5AE POQ+BSnMwSczKwwTbTX4SxpWxWaS/j4= Received: from mx-prod-mc-04.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-74-RztWJB03Ok2WATAY3rE3eQ-1; Fri, 22 Nov 2024 12:52:58 -0500 X-MC-Unique: RztWJB03Ok2WATAY3rE3eQ-1 X-Mimecast-MFC-AGG-ID: RztWJB03Ok2WATAY3rE3eQ Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (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 mx-prod-mc-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 3596019560AF; Fri, 22 Nov 2024 17:52:55 +0000 (UTC) Received: from [10.22.81.129] (unknown [10.22.81.129]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 1195119560A3; Fri, 22 Nov 2024 17:52:51 +0000 (UTC) Message-ID: <4bd8f843-6dfa-4c66-9e42-cf4245166844@redhat.com> Date: Fri, 22 Nov 2024 12:52:51 -0500 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/1] nvme: always enable multipath To: Keith Busch , Christoph Hellwig Cc: Bryan Gurney , linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, sagi@grimberg.me, axboe@kernel.dk, mpe@ellerman.id.au, naveen@kernel.org, maddy@linux.ibm.com, kernel@xen0n.name, bmarzins@redhat.com References: <20241121220321.40616-1-bgurney@redhat.com> <20241122120925.GA25817@lst.de> Content-Language: en-US From: John Meneghini Organization: RHEL Core Storge Team In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241122_095303_780301_9E7ACFD0 X-CRM114-Status: UNSURE ( 7.72 ) X-CRM114-Notice: Please train this message. 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 11/22/24 10:39, Keith Busch wrote: > Anyway, we only use the one physical function, so they're certainly not > multipath devices here. We disable the CONFIG option because while the > nvme multipath IO overhead is low, it's not zero. Do we know what the performance impact is? Has anybody measured the difference? /John