<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=utf-8"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><base target="_blank"><!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:SimSun;
panose-1:2 1 6 0 3 1 1 1 1 1;}
@font-face
{font-family:SimSun;
panose-1:2 1 6 0 3 1 1 1 1 1;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
@font-face
{font-family:"\@SimSun";
panose-1:2 1 6 0 3 1 1 1 1 1;}
@font-face
{font-family:Verdana;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{mso-margin-top-alt:auto;
margin-right:0cm;
mso-margin-bottom-alt:auto;
margin-left:0cm;
font-size:12.0pt;
font-family:"Times New Roman","serif";
mso-believe-normal-left:yes;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle18
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><![if mso 9]><style>p.MsoNormal
{margin-left:9.0pt;}
</style><![endif]><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple style='margin-left:9.0pt;margin-top:9.0pt;margin-right:9.0pt;margin-bottom:9.0pt'><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hi,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>We used to have similar issues with GRE and packet loss/latency in Grizzly. It was caused by wrong (low) MTU size settings on ‘GRE interfaces’. I believe 1546 is the lowest working value (it is part of the official docu these days, it was not back then) Ever since we moved to jumbo frames, all the troubles are gone.<o:p></o:p></span></p><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Cheers,<o:p></o:p></span></p><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Marek </span><span lang=DE style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p></div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> zengshan2008 [mailto:zengshan2008@gmail.com] <br><b>Sent:</b> 14. mája 2014 11:15<br><b>To:</b> Ageeleshwar Kandavelu; gustavo panizzo <gfa>; <openstack@lists.openstack.org><br><b>Subject:</b> Re: [Openstack] [neutron] GRE network with 5 nodes<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='color:black'>Did you found the same problem when using Grizzly version?</span><span style='font-family:SimSun'><o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-family:SimSun'> <o:p></o:p></span></p></div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:silver'>2014-05-14</span><span style='font-family:SimSun'><o:p></o:p></span></p><div class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'><hr size=2 width=122 style='width:91.5pt' align=left></span></div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:silver'>zengshan2008</span><span style='font-family:SimSun'><o:p></o:p></span></p><div><div class=MsoNormal align=center style='margin:0cm;margin-bottom:.0001pt;text-align:center'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'><hr size=2 width="100%" align=center></span></div></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><strong><span style='font-size:10.0pt;font-family:SimSun'>发件人：</span></strong><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Ageeleshwar Kandavelu <Ageeleshwar.Kandavelu@csscorp.com></span><span style='font-family:SimSun'><o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><strong><span style='font-size:10.0pt;font-family:SimSun'>发送时间：</span></strong><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>2014-05-14 17:00</span><span style='font-family:SimSun'><o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><strong><span style='font-size:10.0pt;font-family:SimSun'>主题：</span></strong><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Re: [Openstack] [neutron] GRE network with 5 nodes</span><span style='font-family:SimSun'><o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><strong><span style='font-size:10.0pt;font-family:SimSun'>收件人：</span></strong><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>"gustavo panizzo <gfa>"<gfa@zumbi.com.ar>,"<openstack@lists.openstack.org>"<openstack@lists.openstack.org></span><span style='font-family:SimSun'><o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><strong><span style='font-size:10.0pt;font-family:SimSun'>抄送：</span></strong><span style='font-family:SimSun'><o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-family:SimSun'> <o:p></o:p></span></p></div><div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>I wasn't using ml2. I did a havana with neutron-openvswitch-agent. the old way. Its not only the latency. When I created external network and assigned floatingip and tried to reach it only one or two packets where reaching. it was 99% packet loss. <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>________________________________________ <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>From: gustavo panizzo <gfa> [gfa@zumbi.com.ar] <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Sent: Wednesday, May 14, 2014 2:24 PM <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>To: Ageeleshwar Kandavelu; <openstack@lists.openstack.org> <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Subject: Re: [Openstack] [neutron] GRE network with 5 nodes <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>On 05/14/2014 03:56 AM, Ageeleshwar Kandavelu wrote: <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>> <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>> What I inferred was while using the GRE mode the switch's port were <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>> constantly blinking indicating heavy traffic. I am aware that in GRE <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>> mode there is a mesh of tunnels between the various nodes. I assumed <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>> that the GRE mode was placing a burden too heavy on the switch and tore <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>> down the setup and created a vlan setup instead. The performance was <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>> good with vlan. <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>> <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>> Is this expected or I had been doing something wrong? <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>i've observed the same behavior, gre adds more latency than vlan <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>were you creating new VMs? ml2 pop layer plugin should help in that case <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>-- <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>1AE0 322E B8F7 4717 BDEA BF1D 44BB 1BA7 9F6C 6333 <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>http://www.csscorp.com/common/email-disclaimer.php <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>_______________________________________________ <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Post to : openstack@lists.openstack.org <o:p></o:p></span></p></div><div><p class=MsoNormal style='margin:0cm;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack <o:p></o:p></span></p></div></div></div></body></html>