From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 41czjT4Sw2zF0dl for ; Sat, 28 Jul 2018 18:37:33 +1000 (AEST) Received: from pps.filterd (m0098417.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w6S8Sk7p124362 for ; Sat, 28 Jul 2018 04:37:30 -0400 Received: from e06smtp04.uk.ibm.com (e06smtp04.uk.ibm.com [195.75.94.100]) by mx0a-001b2d01.pphosted.com with ESMTP id 2kgmca1837-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Sat, 28 Jul 2018 04:37:30 -0400 Received: from localhost by e06smtp04.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Sat, 28 Jul 2018 09:37:29 +0100 Subject: Re: [RFC 0/4] Virtio uses DMA API for all devices To: "Michael S. Tsirkin" References: <20180720035941.6844-1-khandual@linux.vnet.ibm.com> <20180720161541-mutt-send-email-mst@kernel.org> <8f51d2c6-cc0c-9e42-f0fd-a8a33acc8b83@linux.vnet.ibm.com> <20180723120511-mutt-send-email-mst@kernel.org> <4062dd48-2b5b-e454-e860-c6bfe321ebdc@linux.vnet.ibm.com> <20180727143008-mutt-send-email-mst@kernel.org> Cc: robh@kernel.org, srikar@linux.vnet.ibm.com, aik@ozlabs.ru, jasowang@redhat.com, linuxram@us.ibm.com, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, hch@infradead.org, paulus@samba.org, joe@perches.com, linuxppc-dev@lists.ozlabs.org, elfring@users.sourceforge.net, haren@linux.vnet.ibm.com, david@gibson.dropbear.id.au From: Anshuman Khandual Date: Sat, 28 Jul 2018 14:07:20 +0530 MIME-Version: 1.0 In-Reply-To: <20180727143008-mutt-send-email-mst@kernel.org> Content-Type: text/plain; charset=windows-1252 Message-Id: <986656ee-37e9-0d99-3d1f-a48466ffe0ed@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On 07/27/2018 05:01 PM, Michael S. Tsirkin wrote: > On Wed, Jul 25, 2018 at 08:56:23AM +0530, Anshuman Khandual wrote: >> Results with and without the patches are similar. > > Thanks! And another thing to try is virtio-net with > a fast NIC backend (40G and up). Unfortunately > at this point loopback tests stress the host > scheduler too much. > Sure. Will look around for a 40G NIC system. BTW I have been testing virtio-net with a TAP device as back end. ip tuntap add dev tap0 mode tap user $(whoami) ip link set tap0 master virbr0 ip link set dev virbr0 up ip link set dev tap0 up which is exported into the guest as follows -device virtio-net,netdev=network0,mac=52:55:00:d1:55:01 \ -netdev tap,id=network0,ifname=tap0,script=no,downscript=no \ But I have not run any network benchmarks on it though.