Red Hat Bugzilla – Bug 632745
[6.1 FEAT] KVM Network Performance: mergeable rx buffers support in vhost-net
Last modified: 2013-01-09 18:07:05 EST
1. Feature Overview: Feature Id: [67149] a. Name of Feature: [6.1 FEAT] KVM Network Performance: mergeable rx buffers support in vhost-net b. Feature Description Enable mergeable rx buffers feature in vhost-net - improves host to guest throughput/latency for small messages. - this features is on by default when using userspace virtio - allows migration between 2 systems with/without vhost. 2. Feature Details: Sponsor: LTC Networking Architectures: x86, x86_64, Arch Specificity: both Affects Kernel Modules: Field does not exist Delivery Mechanism: Backport Category: kernel Request Type: Kernel - Performance Enhancement from Upstream d. Upstream Acceptance: Field does not exist Sponsor Priority P3 f. Severity: high IBM Confidential: No Code Contribution: IBM code g. Component Version Target: --- 3. Business Case KVM network performance is a critical requirement for multiple IBM virtualization/cloud based products and solutions. 4. Primary contact at Red Hat: John Jarvis jjarvis@redhat.com 5. Primary contacts at Partner: Project Management Contact: Michael L. Hohnbaum, hbaum@us.ibm.com Technical contact(s): David L. Stevens, dlstevens@us.ibm.com
------- Comment From rsisk@us.ibm.com 2010-10-04 10:36 EDT------- Code Upstream Status: Accepted
Patch(es) available on kernel-2.6.32-94.el6
This enhancement request was evaluated by the full Red Hat Enterprise Linux team for inclusion in a Red Hat Enterprise Linux minor release. As a result of this evaluation, Red Hat has tentatively approved inclusion of this feature in the next Red Hat Enterprise Linux Update minor release. While it is a goal to include this enhancement in the next minor release of Red Hat Enterprise Linux, the enhancement is not yet committed for inclusion in the next minor release pending the next phase of actual code integration and successful Red Hat and partner testing.
------- Comment From sglass@us.ibm.com 2011-04-06 09:18 EDT------- This feature has been verified by IBM
Created attachment 490693 [details] rhel6.1 vhost-net mrg_rxbuf on vs off Attach the test result of vhost-net mrg_rxbuf=on/off. From Host -> guest, see guest has high udp consumption packet compared with mrg_rxbu=off,but some performance degradation of tcp packet with packet size less than 4096, Others looks good.
According comment #12 ,change the bus status to verified.thanks~~
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2011-0542.html