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Hello, This is a patch to fix vm's outbound traffic control problem. Currently, vm's outbound traffic control by libvirt doesn't go well. This problem was previously discussed at libvir-list ML, however it seems that there isn't still any answer to the problem. http://www.redhat.com/archives/libvir-list/2011-August/msg00333.html I measured Guest(with virtio-net) to Host TCP throughput with the command "netperf -H". Here are the outbound QoS parameters and the results. outbound average rate[kilobytes/s] : Guest to Host throughput[Mbit/s] ====================================================================== 1024 (8Mbit/s) : 4.56 2048 (16Mbit/s) : 3.29 4096 (32Mbit/s) : 3.35 8192 (64Mbit/s) : 3.95 16384 (128Mbit/s) : 4.08 32768 (256Mbit/s) : 3.94 65536 (512Mbit/s) : 3.23 The outbound traffic goes down unreasonably and is even not controled. The cause of this problem is too large mtu value in "tc filter" command run by libvirt. The command uses burst value to set mtu and the burst is equal to average rate value if it's not set. This value is too large. For example if the average rate is set to 1024 kilobytes/s, the mtu value is set to 1024 kilobytes. That's too large compared to the size of network packets. Here libvirt applies tc ingress filter to Host's vnet(tun) device. Tc ingress filter is implemented with TBF(Token Buckets Filter) algorithm. TBF uses mtu value to calculate the amount of token consumed by each packet. With too large mtu value, the token consumption rate is set too large. This leads to token starvation and deterioration of TCP throughput. Then, should we use the default mtu value 2 kilobytes? The anser is No, because Guest with virtio-net device uses 65536 bytes as mtu to transmit packets to Host, and the tc filter with the default mtu value 2k drops packets whose size is larger than 2k. So, the most packets is droped and again leads to deterioration of TCP throughput. The appropriate mtu value is 65536 bytes which is equal to the maximum value of network interface device defined in <linux/netdevice.h>. The value is not so large that it causes token starvation and not so small that it drops most packets. Therefore this patch set the mtu value to 64kb(== 65535 bytes). Again, here are the outbound QoS parameters and the TCP throughput with the libvirt patched. outbound average rate[kilobytes/s] : Guest to Host throughput[Mbit/s] ====================================================================== 1024 (8Mbit/s) : 8.22 2048 (16Mbit/s) : 16.42 4096 (32Mbit/s) : 32.93 8192 (64Mbit/s) : 66.85 16384 (128Mbit/s) : 133.88 32768 (256Mbit/s) : 271.01 65536 (512Mbit/s) : 547.32 The outbound traffic conforms to the given limit. Thank you, Signed-off-by: Eiichi Tsukata <eiichi.tsukata.xh@hitachi.com>
259 lines
11 KiB
Plaintext
259 lines
11 KiB
Plaintext
libvirt Authors
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===============
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The libvirt project was initiated by:
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Daniel Veillard <veillard@redhat.com> or <daniel@veillard.com>
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The primary maintainers and people with commit access rights:
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Daniel Veillard <veillard@redhat.com>
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Daniel Berrange <berrange@redhat.com>
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Richard W.M. Jones <rjones@redhat.com>
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Mark McLoughlin <markmc@redhat.com>
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Anthony Liguori <aliguori@us.ibm.com>
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Jim Meyering <meyering@redhat.com>
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Jim Fehlig <jfehlig@suse.com>
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Chris Lalancette <clalance@redhat.com>
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Cole Robinson <crobinso@redhat.com>
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Guido Günther <agx@sigxcpu.org>
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John Levon <john.levon@sun.com>
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Matthias Bolte <matthias.bolte@googlemail.com>
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Jiří Denemark <jdenemar@redhat.com>
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Dave Allan <dallan@redhat.com>
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Laine Stump <laine@redhat.com>
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Stefan Berger <stefanb@us.ibm.com>
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Eric Blake <eblake@redhat.com>
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Justin Clift <jclift@redhat.com>
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Osier Yang <jyang@redhat.com>
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Wen Congyang <wency@cn.fujitsu.com>
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Michal Prívozník <mprivozn@redhat.com>
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Peter Krempa <pkrempa@redhat.com>
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Christophe Fergeau <cfergeau@redhat.com>
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Alex Jia <ajia@redhat.com>
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Martin Kletzander <mkletzan@redhat.com>
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Previous maintainers:
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Karel Zak <kzak@redhat.com>
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Atsushi SAKAI <sakaia@jp.fujitsu.com>
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Dave Leskovec <dlesko@linux.vnet.ibm.com>
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Dan Smith <danms@us.ibm.com>
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Patches have also been contributed by:
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David Lutterkort <dlutter@redhat.com>
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Andrew Puch <apuch@redhat.com>
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Philippe Berthault <philippe.berthault@Bull.net>
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Hugh Brock <hbrock@redhat.com>
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Michel Ponceau <michel.ponceau@bull.net>
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Jeremy Katz <katzj@redhat.com>
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Pete Vetere <pvetere@redhat.com>
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Kazuki Mizushima <mizushima.kazuk@jp.fujitsu.com>
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Saori Fukuta <fukuta.saori@jp.fujitsu.com>
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Tatsuro Enokura <fj7716hz@aa.jp.fujitsu.com>
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Takahashi Tomohiro <takatom@jp.fujitsu.com>
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Nobuhiro Itou <fj0873gn@aa.jp.fujitsu.com>
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Masayuki Sunou <fj1826dm@aa.jp.fujitsu.com>
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Mark Johnson <johnson.nh@gmail.com>
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Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
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Shuveb Hussain <shuveb@binarykarma.com>
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Jim Paris <jim@jtan.com>
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Daniel Hokka Zakrisson <daniel@hozac.com>
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Mads Chr. Olesen <shiyee@shiyee.dk>
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Anton Protopopov <aspsk2@gmail.com>
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Stefan de Konink <dekonink@kinkrsoftware.nl>
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Kaitlin Rupert <kaitlin@linux.vnet.ibm.com>
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Evgeniy Sokolov <evg@openvz.org>
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David Lively <dlively@virtualiron.com>
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Charles Duffy <Charles_Duffy@messageone.com>
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Nguyen Anh Quynh <aquynh@gmail.com>
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James Morris <jmorris@namei.org>
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Chris Wright <chrisw@redhat.com>
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Ben Guthro <ben.guthro@gmail.com>
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Shigeki Sakamoto <fj0588di@aa.jp.fujitsu.com>
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Gerd von Egidy <lists@egidy.de>
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Itamar Heim <iheim@redhat.com>
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Markus Armbruster <armbru@redhat.com>
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Ryota Ozaki <ozaki.ryota@gmail.com>
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Daniel J Walsh <dwalsh@redhat.com>
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Maximilian Wilhelm <max@rfc2324.org>
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Pritesh Kothari <Pritesh.Kothari@Sun.COM>
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Amit Shah <amit.shah@redhat.com>
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Florian Vichot <florian.vichot@diateam.net>
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Serge E. Hallyn <serue@us.ibm.com>
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Soren Hansen <soren@linux2go.dk>
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Abel Míguez Rodríguez<amiguezr@pdi.ucm.es>
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Doug Goldstein <cardoe@cardoe.com>
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Javier Fontan <jfontan@gmail.com>
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Federico Simoncelli <fsimonce@redhat.com>
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Amy Griffis <amy.griffis@hp.com>
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Henrik Persson E <henrik.e.persson@ericsson.com>
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Satoru SATOH <satoru.satoh@gmail.com>
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Paolo Bonzini <pbonzini@redhat.com>
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Miloslav Trmač <mitr@redhat.com>
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Jamie Strandboge <jamie@canonical.com>
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Gerhard Stenzel <gerhard.stenzel@de.ibm.com>
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Matthew Booth <mbooth@redhat.com>
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Diego Elio Pettenò <flameeyes@gmail.com>
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Adam Litke <agl@us.ibm.com>
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Steve Yarmie <steve.yarmie@gmail.com>
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Dan Kenigsberg <danken@redhat.com>
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Yuji NISHIDA <nishidy@nict.go.jp>
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Dustin Xiong <x_k_123@hotmail.com>
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Rolf Eike Beer <eike@sf-mail.de>
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Wolfgang Mauerer <wolfgang.mauerer@siemens.com>
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Philipp Hahn <hahn@univention.de>
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Ed Swierk <eswierk@aristanetworks.com>
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Paolo Smiraglia <paolo.smiraglia@gmail.com>
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Sharadha Prabhakar <sharadha.prabhakar@citrix.com>
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Chris Wong <wongc-redhat@hoku.net>
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Daniel Berteaud <daniel@firewall-services.com>
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Dustin Kirkland <kirkland@canonical.com>
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Luiz Capitulino <lcapitulino@redhat.com>
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Ryan Harper <ryanh@us.ibm.com>
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Spencer Shimko <sshimko@tresys.com>
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Marco Bozzolan <bozzolan@gmail.com>
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Alex Williamson <alex.williamson@redhat.com>
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Ersek Laszlo <lacos@caesar.elte.hu>
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Kenneth Nagin <NAGIN@il.ibm.com>
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Klaus Ethgen <Klaus@Ethgen.de>
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Bryan Kearney <bkearney@redhat.com>
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Darry L. Pierce <dpierce@redhat.com>
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David Jorm <dfj@redhat.com>
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Eduardo Otubo <otubo@linux.vnet.ibm.com>
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Garry Dolley <gdolley@arpnetworks.com>
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Harshavardhana <harsha@gluster.com>
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Jonas Eriksson <jonas.j.eriksson@ericsson.com>
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Jun Koi <junkoi2004@gmail.com>
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Olivier Fourdan <ofourdan@redhat.com>
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Ron Yorston <rmy@tigress.co.uk>
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Shahar Klein <shaharklein@yahoo.com>
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Taizo ITO <taizo.ito@hde.co.jp>
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Thomas Treutner <thomas@scripty.at>
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Jean-Baptiste Rouault <jean-baptiste.rouault@diateam.net>
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Марк Коренберг <socketpair@gmail.com>
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Alan Pevec <apevec@redhat.com>
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Aurelien Rougemont <beorn@binaries.fr>
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Patrick Dignan <pat_dignan@dell.com>
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Serge Hallyn <serge.hallyn@canonical.com>
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Nikunj A. Dadhania <nikunj@linux.vnet.ibm.com>
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Lai Jiangshan <laijs@cn.fujitsu.com>
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Harsh Prateek Bora <harsh@linux.vnet.ibm.com>
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John Morrissey <jwm@horde.net>
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KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
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Hu Tao <hutao@cn.fujitsu.com>
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Laurent Léonard <laurent@open-minds.org>
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MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp>
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Josh Durgin <josh.durgin@dreamhost.com>
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Roopa Prabhu <roprabhu@cisco.com>
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Paweł Krześniak <pawel.krzesniak@gmail.com>
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Kay Schubert <kayegypt@web.de>
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Marc-André Lureau <marcandre.lureau@redhat.com>
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Juerg Haefliger <juerg.haefliger@hp.com>
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Matthias Dahl <mdvirt@designassembly.de>
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Niels de Vos <ndevos@redhat.com>
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Davidlohr Bueso <dave@gnu.org>
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Alon Levy <alevy@redhat.com>
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Hero Phương <herophuong93@gmail.com>
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Zdenek Styblik <stybla@turnovfree.net>
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Gui Jianfeng <guijianfeng@cn.fujitsu.com>
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Michal Novotny <minovotn@redhat.com>
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Markus Groß <gross@univention.de>
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Phil Petty <phpetty@cisco.com>
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Taku Izumi <izumi.taku@jp.fujitsu.com>
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Minoru Usui <usui@mxm.nes.nec.co.jp>
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Tiziano Mueller <dev-zero@gentoo.org>
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Thibault VINCENT <thibault.vincent@smartjog.com>
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Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
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Jesse Cook <code.crashenx@gmail.com>
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Alexander Todorov <atodorov@otb.bg>
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Richard Laager <rlaager@wiktel.com>
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Mark Wu <dwu@redhat.com>
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Yufang Zhang <yuzhang@redhat.com>
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Supriya Kannery <supriyak@linux.vnet.ibm.com>
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Dirk Herrendoerfer <d.herrendoerfer@herrendoerfer.name>
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Taisuke Yamada <tai@rakugaki.org>
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Heath Petersen <HeathPetersen@Kandre.com>
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Neil Wilson <neil@aldur.co.uk>
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Ohad Levy <ohadlevy@gmail.com>
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Michael Chapman <mike@very.puzzling.org>
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Daniel Gollub <gollub@b1-systems.de>
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David S. Wang <dwang2@cisco.com>
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Ruben Kerkhof <ruben@rubenkerkhof.com>
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Scott Moser <smoser@ubuntu.com>
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Guannan Ren <gren@redhat.com>
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John Williams <john.williams@petalogix.com>
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Michael Santos <michael.santos@gmail.com>
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Oskari Saarenmaa <os@ohmu.fi>
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Nan Zhang <nzhang@redhat.com>
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Wieland Hoffmann <themineo@googlemail.com>
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Douglas Schilling Landgraf <dougsland@redhat.com>
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Tom Vijlbrief <tom.vijlbrief@xs4all.nl>
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Shradha Shah <sshah@solarflare.com>
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Steve Hodgson <shodgson@solarflare.com>
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Xu He Jie <xuhj@linux.vnet.ibm.com>
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Lei Li <lilei@linux.vnet.ibm.com>
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Matthias Witte <witte@netzquadrat.de>
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Tang Chen <tangchen@cn.fujitsu.com>
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Dan Horák <dan@danny.cz>
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Sage Weil <sage@newdream.net>
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David L Stevens <dlstevens@us.ibm.com>
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Tyler Coumbes <coumbes@gmail.com>
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Wen Ruo Lv <lvroyce@linux.vnet.ibm.com>
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Patrice LACHANCE <patlachance@gmail.com>
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Eli Qiao <taget@linux.vnet.ibm.com>
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Michael Wood <esiotrot@gmail.com>
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Bharata B Rao <bharata@linux.vnet.ibm.com>
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Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
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Chang Liu <lingjiao.lc@taobao.com>
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Lorin Hochstein <lorin@isi.edu>
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Christian Franke <nobody@nowhere.ws>
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Prerna Saxena <prerna@linux.vnet.ibm.com>
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Michael Ellerman <michael@ellerman.id.au>
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Rommer <rommer@active.by>
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Yuri Chornoivan <yurchor@ukr.net>
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Deepak C Shetty <deepakcs@linux.vnet.ibm.com>
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Laszlo Ersek <lersek@redhat.com>
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Zeeshan Ali (Khattak) <zeeshanak@gnome.org>
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Marcelo Cerri <mhcerri@linux.vnet.ibm.com>
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Hendrik Schwartke <hendrik@os-t.de>
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Ansis Atteka <aatteka@nicira.com>
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Dan Wendlandt <dan@nicira.com>
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Kyle Mestery <kmestery@cisco.com>
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Lincoln Myers <lincoln_myers@yahoo.com>
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Peter Robinson <pbrobinson@gmail.com>
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Benjamin Cama <benoar@dolka.fr>
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Duncan Rance <libvirt@dunquino.com>
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Peng Zhou <ailvpeng25@gmail.com>
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Li Zhang <zhlcindy@linux.vnet.ibm.com>
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Stef Walter <stefw@gnome.org>
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Christian Benvenuti <benve@cisco.com>
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Ilja Livenson <ilja.livenson@gmail.com>
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Stefan Bader <stefan.bader@canonical.com>
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MATSUDA Daiki <matsudadik@intellilink.co.jp>
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Jan Kiszka <jan.kiszka@siemens.com>
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Ryan Woodsmall <rwoodsmall@gmail.com>
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Wido den Hollander <wido@widodh.nl>
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Eugen Feller <eugen.feller@inria.fr>
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Dmitry Guryanov <dguryanov@parallels.com>
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William Jon McCann <william.jon.mccann@gmail.com>
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David Weber <wb@munzinger.de>
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Marti Raudsepp <marti@juffo.org>
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Radu Caragea <dmns_serp@yahoo.com>
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Beat Jörg <Beat.Joerg@ssatr.ch>
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Gao feng <gaofeng@cn.fujitsu.com>
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Dipankar Sarma <dipankar@in.ibm.com>
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Gerd Hoffmann <kraxel@redhat.com>
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Viktor Mihajlovski <mihajlov@linux.vnet.ibm.com>
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Thang Pham <thang.pham@us.ibm.com>
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Eiichi Tsukata <eiichi.tsukata.xh@hitachi.com>
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[....send patches to get your name here....]
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The libvirt Logo was designed by Diana Fong
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-- End
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