From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 58CC2175A5 for ; Fri, 22 Nov 2024 17:53:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732297984; cv=none; b=UR270/RGq2fIoTI+J7TzszNgMlIlIBrPfrj6K/0JEGLMmJHYcTusWvZizi0fMrRMqCDj0FadZ2/39GgBdv9nUWCgjS8B7u0gyxNKB6c7hBbIg+tyU8sI1FpXdEYt8Psal9TGKXC2HDdHjvVetVyjghamDQemQuU6n8FX04gVv4Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732297984; c=relaxed/simple; bh=wsTkX6pJNyPokLpxfhwCoXSmd2PpmgMvlsBk/iZ2Z8Y=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=QRgEA0NGPLc8fHdvhASFEnGdH1CzlsSl+mHlPwxwBn2vccwH0cg2anSRgwOygVZFt5F9CWIneVl2rFdGv/htUKJLI5GvwT4pZcc/K1+0KHAcMZXQv+9OhqUxt3XuoDWNPxJ//zhdYqPhMstk+d62ZQ7T89+NmAziKOWogs4Om5w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=auVtE4b1; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="auVtE4b1" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1732297981; 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=auVtE4b10Y/gVx0PXAh5pawjYWaQqBltmEhZF1MXeA9dSog3mZhrLK6F0j4QqlQQNackr8 Gc8pKB4z+6/YMXJ3NHqhXXPLymj55AbgeRoWBtpsJykRow5hIM7OQ/RVdwJgS/cUXtT/DJ QZPkaF49V7geRHBqSsdCQaoaCeoGPjM= 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 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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 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