Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753799AbaKEIA6 (ORCPT ); Wed, 5 Nov 2014 03:00:58 -0500 Received: from [119.145.14.65] ([119.145.14.65]:40665 "EHLO szxga02-in.huawei.com" rhost-flags-FAIL-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751325AbaKEIA5 (ORCPT ); Wed, 5 Nov 2014 03:00:57 -0500 Message-ID: <5459D8E8.6060709@huawei.com> Date: Wed, 5 Nov 2014 15:59:36 +0800 From: Shannon Zhao User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 MIME-Version: 1.0 To: CC: , , , , , , , , , Subject: Re: [RFC PATCH] virtio-mmio: support for multiple irqs References: <1415093712-15156-1-git-send-email-zhaoshenglong@huawei.com> In-Reply-To: <1415093712-15156-1-git-send-email-zhaoshenglong@huawei.com> Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.177.16.142] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2014/11/4 17:35, Shannon Zhao wrote: > As the current virtio-mmio only support single irq, > so some advanced features such as vhost-net with irqfd > are not supported. And the net performance is not > the best without vhost-net and irqfd supporting. > Hi Joel, Peter, Mst, Some virtio-net with virtio-mmio performance data on ARM added as followed: Type of backend bandwith(GBytes/sec) virtio-net 0.66 vhost-net 1.49 vhost-net with irqfd 2.01 Test cmd: ./iperf -c 192.168.0.2 -P 1 -i 10 -p 5001 -f G -t 60 >From this test data, irqfd has great improvement (about 30%) on performance. So maybe it's necessary to enable multiple irq support to make vhost-net with virtio-mmio on ARM be able to use irqfd. How do you guys think? Look forward for your feedback. Thanks, Shannon > This patch support virtio-mmio to request multiple > irqs like virtio-pci. With this patch and qemu assigning > multiple irqs for virtio-mmio device, it's ok to use > vhost-net with irqfd on arm/arm64. > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/