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I am assuming that the OP meant that his upstream is set to 1500<br>
<br>
Jumbo frames has to be set end to end, all devices. <br>
<br>
Otherwise you will be introducing more errors...<br>
<br>
<br>
<div class="moz-cite-prefix">On 01/27/2014 05:32 PM, Li, Chen wrote:<br>
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi
Ageeleshwar,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I
guess I just asked similar question yesterday.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">But,
I’m not understand what you mean “</span><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">when
your ethernet is limited to 1500</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">”.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Not
sure if we’re talking at the right direction.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Anyway,
here is what I know:<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">This
is based on if you’re using neutron + ovs.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><span
style="mso-list:Ignore">1.<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Configure
/etc/neutron/plugins/openvswitch/ovs_neutron_plugin.ini<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:.5in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">veth_mtu
= ${your_MTU}<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:.5in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">If
you’re using gre/vxlan, this configure can be ignored.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:.5in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><span
style="mso-list:Ignore">2.<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Configure
/etc/nova/nova.conf<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:.5in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">network_device_mtu=
${your_MTU}<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:.5in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">But
this may not work due to bug
<a moz-do-not-send="true"
href="https://bugs.launchpad.net/nova/+bug/1260697">https://bugs.launchpad.net/nova/+bug/1260697</a>.<o:p></o:p></span></p>
<p class="MsoListParagraph"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Unless
you apply the fix patch.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:.5in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><span
style="mso-list:Ignore">3.<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Configure
/etc/neutron/</span>
<span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">dhcp_agent.ini<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:.5in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">dnsmasq_config_file
= /etc/neutron/dnsmasq-neutron.conf<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:.5in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">And
add to /etc/neutron/dnsmasq-neutron.conf:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:.5in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">dhcp-option-force=26,${your_MTU}<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I’m
working under CentOS 6.4+ Havana + OVS + GRE.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">And
I just tested it, It works fine to me.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I
have configured MTU=8500 in all configure files, while the
physical NIC used for OVS (local IP) is using MTU=9000.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">-chen<o:p></o:p></span></p>
<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 0in 0in 0in">
<p class="MsoNormal"><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"">
Ageeleshwar Kandavelu
[<a class="moz-txt-link-freetext" href="mailto:Ageeleshwar.Kandavelu@csscorp.com">mailto:Ageeleshwar.Kandavelu@csscorp.com</a>]
<br>
<b>Sent:</b> Monday, January 27, 2014 9:57 PM<br>
<b>To:</b> Li, Chen<br>
<b>Cc:</b> <a class="moz-txt-link-abbreviated" href="mailto:openstack@lists.openstack.org">openstack@lists.openstack.org</a><br>
<b>Subject:</b> [Openstack] How to enable jumbo frames
for instances<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">Hi,<br>
Is it possible to have a higher MTU when your ethernet is
limited to 1500?<br>
<br>
Thank you,<br>
Ageeleshwar K<o:p></o:p></span></p>
</div>
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href="http://www.csscorp.com/common/email-disclaimer.php">http://www.csscorp.com/common/email-disclaimer.php</a>
<o:p></o:p></p>
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