From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Wang Subject: Re: [net-next RFC V4 PATCH 0/4] Multiqueue virtio-net Date: Tue, 26 Jun 2012 14:02:46 +0800 Message-ID: <4FE95086.2020207@redhat.com> References: <20120625090829.7263.65026.stgit@amd-6168-8-1.englab.nay.redhat.com> <4FE8A4B6.1080200@us.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4FE8A4B6.1080200@us.ibm.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org To: Sridhar Samudrala Cc: krkumar2@in.ibm.com, habanero@linux.vnet.ibm.com, kvm@vger.kernel.org, mst@redhat.com, netdev@vger.kernel.org, mashirle@us.ibm.com, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, edumazet@google.com, tahm@linux.vnet.ibm.com, jwhan@filewood.snu.ac.kr, davem@davemloft.net List-Id: virtualization@lists.linuxfoundation.org On 06/26/2012 01:49 AM, Sridhar Samudrala wrote: > On 6/25/2012 2:16 AM, Jason Wang wrote: >> Hello All: >> >> This series is an update version of multiqueue virtio-net driver >> based on >> Krishna Kumar's work to let virtio-net use multiple rx/tx queues to >> do the >> packets reception and transmission. Please review and comments. >> >> Test Environment: >> - Intel(R) Xeon(R) CPU E5620 @ 2.40GHz, 8 cores 2 numa nodes >> - Two directed connected 82599 >> >> Test Summary: >> >> - Highlights: huge improvements on TCP_RR test >> - Lowlights: regression on small packet transmission, higher cpu >> utilization >> than single queue, need further optimization > Does this also scale with increased number of VMs? > Hi Sridhar: Good suggestions, I didn't measure them. I would run test and post them. Thanks > Thanks > Sridhar >> >> Analysis of the performance result: >> >> - I count the number of packets sending/receiving during the test, and >> multiqueue show much more ability in terms of packets per second. >> >> - For the tx regression, multiqueue send about 1-2 times of more packets >> compared to single queue, and the packets size were much smaller >> than single >> queue does. I suspect tcp does less batching in multiqueue, so I >> hack the >> tcp_write_xmit() to forece more batching, multiqueue works as well as >> singlequeue for both small transmission and throughput >> >> - I didn't pack the accelerate RFS with virtio-net in this sereis as >> it still >> need further shaping, for the one that interested in this please see: >> http://www.mail-archive.com/kvm@vger.kernel.org/msg64111.html >> >> > > -- > To unsubscribe from this list: send the line "unsubscribe netdev" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html