From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:57187) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1da48n-0002fo-Jp for qemu-devel@nongnu.org; Tue, 25 Jul 2017 14:01:06 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1da48k-0002L1-Kd for qemu-devel@nongnu.org; Tue, 25 Jul 2017 14:01:05 -0400 Received: from mga04.intel.com ([192.55.52.120]:2437) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1da48k-0002I8-BA for qemu-devel@nongnu.org; Tue, 25 Jul 2017 14:01:02 -0400 References: <767EFADFF809234DB6CAABD6D2F93847C5D31539@IRSMSX107.ger.corp.intel.com> <3319b641-b7f3-0ee8-e5ed-9c378e723eb4@redhat.com> <14b1b111-d2d6-6954-2d12-8e0ac791ae44@redhat.com> <97068eca-2788-8396-0f8d-1990c651bdfc@redhat.com> <20170723200440.GA3718@morn.lan> <767EFADFF809234DB6CAABD6D2F93847C5D3A5BC@IRSMSX107.ger.corp.intel.com> <8377f92c-9b65-0da4-2a5c-86c1e5d49448@redhat.com> From: "Kinsella, Ray" Message-ID: Date: Tue, 25 Jul 2017 11:00:28 -0700 MIME-Version: 1.0 In-Reply-To: <8377f92c-9b65-0da4-2a5c-86c1e5d49448@redhat.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] >256 Virtio-net-pci hotplug Devices List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Marcel Apfelbaum , Kevin O'Connor Cc: "Tan, Jianfeng" , "seabios@seabios.org" , Michael Tsirkin , "qemu-devel@nongnu.org" , Gerd Hoffmann Hi Marcel, On 24/07/2017 00:14, Marcel Apfelbaum wrote: > On 24/07/2017 7:53, Kinsella, Ray wrote: > > Even if I am not aware of how much time would take to init a bare-metal > PCIe Root Port, it seems too much. > So I repeated the testing for 64, 128, 256 and 512 ports. I ensured the configuration was sane, that 128 was twice the number of root ports and virtio-pci-net devices as 64. I got the following results - shown in seconds, as you can see it is non linear but not exponential, there is something that is not scaling well. 64 128 256 512 PCIe Root Ports 14 72 430 2672 ACPI 4 35 342 3863 Loading Drivers 1 1 31 621 Total Boot 34 137 890 7516 ( I did try to test 1024 devices, but it just dies silently ) Ray K