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dmarc=fail (p=none dis=none) header.from=oracle.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:37674 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j8qkz-0007zX-4u for qemu-devel@archiver.kernel.org; Mon, 02 Mar 2020 14:29:37 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:56289) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j8qk5-00073B-G0 for qemu-devel@nongnu.org; Mon, 02 Mar 2020 14:28:43 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1j8qk4-0005dz-6w for qemu-devel@nongnu.org; Mon, 02 Mar 2020 14:28:41 -0500 Received: from userp2130.oracle.com ([156.151.31.86]:57526) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1j8qk3-0005dg-A4 for qemu-devel@nongnu.org; Mon, 02 Mar 2020 14:28:39 -0500 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 022JRhjO085627; 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Mon, 2 Mar 2020 19:28:26 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by userp3020.oracle.com with ESMTP id 2yg1p2g66f-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 02 Mar 2020 19:28:26 +0000 Received: from abhmp0009.oracle.com (abhmp0009.oracle.com [141.146.116.15]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 022JSClR019702; Mon, 2 Mar 2020 19:28:12 GMT Received: from [10.152.34.2] (/10.152.34.2) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 02 Mar 2020 11:28:06 -0800 ORGANIZATION: Oracle Corporation USER-AGENT: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 Content-Language: en-US MIME-Version: 1.0 Message-ID: <6f32987b-4d27-5a4d-ee91-fc9e021b0644@oracle.com> Date: Mon, 2 Mar 2020 11:28:04 -0800 (PST) From: Jag Raman To: Stefan Hajnoczi Subject: Re: [PATCH v5 47/50] multi-process: Enable support for multiple devices in remote References: <20200228164403.GA332098@stefanha-x1.localdomain> In-Reply-To: <20200228164403.GA332098@stefanha-x1.localdomain> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9548 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 malwarescore=0 mlxlogscore=999 mlxscore=0 spamscore=0 adultscore=0 bulkscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2003020126 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9548 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 mlxscore=0 bulkscore=0 adultscore=0 suspectscore=0 spamscore=0 malwarescore=0 impostorscore=0 priorityscore=1501 mlxlogscore=999 lowpriorityscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2003020126 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 156.151.31.86 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: elena.ufimtseva@oracle.com, fam@euphon.net, swapnil.ingle@nutanix.com, john.g.johnson@oracle.com, qemu-devel@nongnu.org, kraxel@redhat.com, quintela@redhat.com, mst@redhat.com, armbru@redhat.com, kanth.ghatraju@oracle.com, felipe@nutanix.com, thuth@redhat.com, ehabkost@redhat.com, konrad.wilk@oracle.com, dgilbert@redhat.com, liran.alon@oracle.com, pbonzini@redhat.com, rth@twiddle.net, kwolf@redhat.com, berrange@redhat.com, mreitz@redhat.com, ross.lagerwall@citrix.com, marcandre.lureau@gmail.com, thanos.makatos@nutanix.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 2/28/2020 11:44 AM, Stefan Hajnoczi wrote: > On Mon, Feb 24, 2020 at 03:55:38PM -0500, Jagannathan Raman wrote: >> From: Elena Ufimtseva >> >> Add support to allow multiple devices to be configured in the >> remote process > > This patch allows multiple devices to be addressed over a single UNIX > domain socket. This could be a scalability/performance bottleneck > because an SMP guest can only talk to 1 device at a time. > > This approach doesn't address the qemu-storage-daemon use case where one > device emulation process provides devices to multiple guests. Multiple > UNIX domain sockets are needed for that. > > Is multiplexing multiple devices over a single connection is a desirable > feature? The alternative of one UNIX domain socket per device instance > seems more practical to me because it should perform better and solves > the qemu-storage-daemon use case. Hi Stefan, We will implement a separate communication channel for each device in the remote process, in the next series. Thanks! -- Jag >