From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757501AbaDHPnh (ORCPT ); Tue, 8 Apr 2014 11:43:37 -0400 Received: from na01-sn2-obe.ptr.o365filtering.com ([157.55.158.27]:29369 "EHLO na01-sn2-obe.outbound.o365filtering.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756944AbaDHPne (ORCPT ); Tue, 8 Apr 2014 11:43:34 -0400 From: Haiyang Zhang To: Sharat Masetty , David Miller CC: Linux Netdev List , KY Srinivasan , "olaf@aepfle.de" , "jasowang@redhat.com" , "linux-kernel@vger.kernel.org" , "driverdev-devel@linuxdriverproject.org" Subject: RE: [PATCH net-next,v4] hyperv: Add support for virtual Receive Side Scaling (vRSS) Thread-Topic: [PATCH net-next,v4] hyperv: Add support for virtual Receive Side Scaling (vRSS) Thread-Index: AQHPUo9hwVfmBzXAgEOnJHwk6QrgC5sG8p4AgAA6kICAAK1G4A== Date: Tue, 8 Apr 2014 15:43:25 +0000 Message-ID: <44c82a884313465184d9a15a66248d3b@DFM-DB3MBX15-06.exchange.corp.microsoft.com> References: <1396898623-31667-1-git-send-email-haiyangz@microsoft.com> <20140407.144258.2113005286706932770.davem@davemloft.net> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [157.59.235.233] Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-Forefront-Antispam-Report: CIP:131.107.159.99;IPV:NLI;EFV:NLI;SFV:NSPM;SFS:(10009001)(13464003)(377454003)(164054003)(51704005)(199002)(189002)(23676002)(99396002)(2009001)(2656002)(47976001)(97736001)(46102001)(4396001)(51856001)(53806001)(47736001)(6806004)(81342001)(87266001)(74662001)(49866001)(50986002)(87936001)(74876001)(94946001)(33646001)(59766001)(77982001)(56776001)(31966008)(93516002)(80976001)(92566001)(95666003)(79102001)(97336001)(63696002)(94316002)(19580395003)(76796001)(85852003)(65816001)(80022001)(47776003)(76786001)(76482001)(83322001)(81542001)(97186001)(74706001)(54356001)(74366001)(56816005)(19580405001)(74502001)(86612001)(47446002)(90146001)(81816001)(83072002)(50466002)(69226001)(81686001)(84676001)(98676001)(85306002)(54316002)(44976005)(95416001)(20776003)(66066001)(93136001)(15975445006)(142933001)(24736002);DIR:OUT;SFP:1101;SCL:1;SRVR:BL2SR01MB592;H:hybrid.exchange.microsoft.com;FPR:687C411E.2CF3B7C1.71EB1F0F.44E4DA7B.20230;PTR:InfoDomainNonexistent;A:1;MX:1;LANG:en; X-Exchange-Organization-AntiSpam-Internal: BULK:None;ACTION:Default;RISK:Low;SCL:0;SPMLVL:NotSpam;PCL:0;RULEID:(2001) X-Forefront-PRVS: 017589626D X-OriginatorOrg: msft.ccsctp.net Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by mail.home.local id s38Fhn1M012107 > -----Original Message----- > From: Sharat Masetty [mailto:sharat04@gmail.com] > Sent: Monday, April 7, 2014 6:13 PM > To: David Miller > Cc: Haiyang Zhang; Linux Netdev List; KY Srinivasan; olaf@aepfle.de; > jasowang@redhat.com; linux-kernel@vger.kernel.org; driverdev- > devel@linuxdriverproject.org > Subject: Re: [PATCH net-next,v4] hyperv: Add support for virtual Receive Side > Scaling (vRSS) > > Hi Zhang, > > How is this beneficial when compared to RPS(receive packet steering)? > Can you please provide more details on what this patch does? This patch supports the virtual RSS feature provided by Hyper-V hosts. Currently, the interrupts are received on only one CPU per vNIC. With this feature, we can receive interrupts from multiple CPUs and VMBus channels for one vNIC. Outgoing packets are put into multiple channels as well. So the network throughput can scale up with the number of CPUs for a VM. RPS is basically a software implementation of RSS. This is an online doc about these features: https://www.kernel.org/doc/Documentation/networking/scaling.txt Thanks, - Haiyang {.n++%ݶw{.n+{G{ayʇڙ,jfhz_(階ݢj"mG?&~iOzv^m ?I