<div dir="ltr"><span style="font-size:13px">Well, here we are using de Icehouse with Ubuntu 14.04 LTS</span><div style="font-size:13px"><br></div><div style="font-size:13px">We found this <a href="https://ask.openstack.org/en/question/42604/irregular-network-latency-to-instances/" target="_blank">thread</a> in the community and we apply the changes in the compute nodes (change VHOST_NET_ENABLED to 1 in /etc/default/qemu-kvm). After do this, a few instances the problem doesn't exists anymore. This <a href="https://blog.codecentric.de/en/2014/09/openstack-crime-story-solved-tcpdump-sysdig-iostat-episode-3/" target="_blank">link</a> show an investigation to find the problem.</div><div style="font-size:13px"><br></div><div style="font-size:13px">About the MTU in our cloud (using iperf),</div><div style="font-size:13px"><br></div><div style="font-size:13px">1-from any the Desktop to the Network Node</div><div style="font-size:13px">MSS size 1448 bytes (MTU 1500 bytes, ethernet)</div><div style="font-size:13px"><br></div><div style="font-size:13px">2-from any Desktop to the instance</div><div style="font-size:13px">MSS size 1348 bytes (MTU 1388 bytes, unknown interface)</div><div style="font-size:13px"><br></div><div style="font-size:13px">3- from any instance to the Network Node</div><div style="font-size:13px">MSS size 1348 bytes (MTU 1388 bytes, unknown interface)<br></div><div style="font-size:13px"><br></div><div style="font-size:13px">4- from any instance to the Desktop</div><div style="font-size:13px">MSS size 1348 bytes (MTU 1388 bytes, unknown interface)<br></div><div style="font-size:13px"><br></div><div style="font-size:13px">5-from Network Node to any ComputeNode</div><div style="font-size:13px">MSS size 1448 bytes (MTU 1500 bytes, ethernet)<br></div><div style="font-size:13px"><br></div><div style="font-size:13px">6-from any ComputeNode to NetworkNode</div><div style="font-size:13px">MSS size 1448 bytes (MTU 1500 bytes, ethernet)</div></div><div class="gmail_extra"><br><div class="gmail_quote">On 10 December 2014 at 10:31, somshekar kadam <span dir="ltr"><<a href="mailto:som_kadam@yahoo.co.in" target="_blank">som_kadam@yahoo.co.in</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div style="color:#000;background-color:#fff;font-family:Helvetica Neue-Light,Helvetica Neue Light,Helvetica Neue,Helvetica,Arial,Lucida Grande,Sans-Serif;font-size:16px">Sorry for wrong post mail chain. <br><div><span></span></div><div> </div><div><div>
<br>Regards
<br>Neelu</div></div><div><div class="h5"> <div><br><br></div><div style="display:block"> <div style="font-family:Helvetica Neue-Light,Helvetica Neue Light,Helvetica Neue,Helvetica,Arial,Lucida Grande,Sans-Serif;font-size:16px"> <div style="font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,Sans-Serif;font-size:12px"> <div dir="ltr"> <font face="Arial"> On Wednesday, 10 December 2014 6:59 PM, somshekar kadam <<a href="mailto:som_kadam@yahoo.co.in" target="_blank">som_kadam@yahoo.co.in</a>> wrote:<br> </font> </div> <br><br> <div><div><div><div style="color:#000;background-color:#fff;font-family:Helvetica Neue-Light,Helvetica Neue Light,Helvetica Neue,Helvetica,Arial,Lucida Grande,Sans-Serif;font-size:16px"><div>Hi All, <br clear="none"></div><div><br clear="none"></div><div dir="ltr">Please recommend which stable Host OS to use for Controller and Compute node.</div><div dir="ltr">I have tried Fedora20 seems lot of tweaking is required, corerct me If I am wrong. <br clear="none"></div><div dir="ltr">I see that most of it is tested on ubuntu and centos. <br clear="none"></div><div dir="ltr">I am planning to use JUNO stable version. <br clear="none"></div><div dir="ltr">Please help on this<br clear="none"></div><div><span></span></div><div> </div><div><div>
<br clear="none">Regards
<br clear="none">Neelu</div></div> <div><br clear="none"><br clear="none"></div><div style="display:block"> <div style="font-family:Helvetica Neue-Light,Helvetica Neue Light,Helvetica Neue,Helvetica,Arial,Lucida Grande,Sans-Serif;font-size:16px"> <div style="font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,Sans-Serif;font-size:12px"> <div><div dir="ltr"> <font face="Arial"> On Wednesday, 10 December 2014 5:42 PM, Hannah Fordham <<a href="mailto:hfordham@radiantworlds.com" target="_blank">hfordham@radiantworlds.com</a>> wrote:<br clear="none"> </font> </div> <br clear="none"><br clear="none"> <div><div><div>I'm afraid we didn't, we're still struggling with some VMs with this problem. Sorry!<br clear="none"><br clear="none"><div>On 9 December 2014 14:09:32 GMT+00:00, "André Aranha" <<a href="mailto:andre.f.aranha@gmail.com" target="_blank">andre.f.aranha@gmail.com</a>> wrote:<blockquote style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="ltr">Hi,<div><br clear="none"></div><div>We are with the same issue here, and already try some solutions that didn't work at all. Did you solved this problem?</div><div><br clear="none"></div><div>Thank you,</div><div>Andre Aranha</div></div><div><br clear="none"><div>On 27 August 2014 at 08:17, Hannah Fordham <span dir="ltr"><<a rel="nofollow" shape="rect" href="mailto:hfordham@radiantworlds.com" target="_blank">hfordham@radiantworlds.com</a>></span> wrote:<br clear="none"><blockquote style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-GB"><div><div>I’ve been trying to figure this one out for a while, so I’ll try and be as thorough as possible in this post but apologies if I miss anything pertinent out.<u></u><u></u></div><div><u></u> <u></u></div><div>First off, I’m running a set up with one control node and 5 compute nodes, all created using the Stackgeek scripts
- <a rel="nofollow" shape="rect" href="http://www.stackgeek.com/guides/gettingstarted.html" target="_blank">http://www.stackgeek.com/guides/gettingstarted.html</a>. The first two (compute1 and compute 2) were created at the same time, compute3, 4 and 5 were added as needed later. My VMs are predominantly CentOS, while my Openstack nodes are Ubuntu 14.04.1<u></u><u></u></div><div><u></u> <u></u></div><div><b>The symptom: </b>irregular high latency/packet loss to VMs on all compute boxes except compute3. Mostly a pain when trying to do anything via ssh on a VM because the lag makes it difficult to do anything, but it shows itself quite nicely through pings as well:<u></u><u></u></div><div>--- 10.0.102.47 ping statistics ---<u></u><u></u></div><div>111 packets transmitted, 103 received, 7% packet loss, time 110024ms<u></u><u></u></div><div>rtt min/avg/max/mdev = 0.096/367.220/5593.100/1146.920 ms, pipe 6<u></u><u></u></div><div><u></u> <u></u></div><div><br clear="none"><b>I have tested these pings:<u></u><u></u></b></div><div>VM to itself (via its external IP) seems fine<u></u><u></u></div><div>VM to another VM is not fine<u></u><u></u></div><div>Hosting compute node to VM is not fine<u></u><u></u></div><div>My PC to VM is not fine (however the other way round works fine)<u></u><u></u></div><div><u></u> <u></u></div><div><u></u> <u></u></div><div><b>Top on a (32 core) compute node with laggy VMs:<u></u><u></u></b></div><div>top - 12:09:20 up 33 days, 21:35, 1 user, load average: 2.37, 4.95, 6.23<u></u><u></u></div><div>Tasks: 431 total, 2 running, 429 sleeping, 0 stopped, 0 zombie<u></u><u></u></div><div>%Cpu(s): 0.6 us, 3.4 sy, 0.0 ni, 96.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st<u></u><u></u></div><div>KiB Mem: 65928256 total, 44210348 used, 21717908 free, 341172 buffers<u></u><u></u></div><div>KiB Swap: 7812092 total, 1887864 used, 5924228 free. 7134740 cached Mem<u></u><u></u></div><div><u></u> <u></u></div><div><b>And for comparison, on the one compute node that doesn’t seem to be suffering from this:<u></u><u></u></b></div><div>top - 12:12:20 up 33 days, 21:38, 1 user, load average: 0.28, 0.18, 0.15<u></u><u></u></div><div>Tasks: 399 total, 3 running, 396 sleeping, 0 stopped, 0 zombie<u></u><u></u></div><div>%Cpu(s): 0.3 us, 0.1 sy, 0.0 ni, 98.9 id, 0.6 wa, 0.0 hi, 0.0 si, 0.0 st<u></u><u></u></div><div>KiB Mem: 65928256 total, 49986064 used, 15942192 free, 335788 buffers<u></u><u></u></div><div>KiB Swap: 7812092 total, 919392 used, 6892700 free. 39272312 cached Mem<u></u><u></u></div><div><u></u> <u></u></div><div><b>Top on a laggy VM:<u></u><u></u></b></div><div>top - 11:02:53 up 27 days, 33 min, 3 users, load average: 0.00, 0.00, 0.00<u></u><u></u></div><div>Tasks: 91 total, 1 running, 90 sleeping, 0 stopped, 0 zombie<u></u><u></u></div><div>Cpu(s): 0.2%us, 0.1%sy, 0.0%ni, 99.5%id, 0.1%wa, 0.0%hi, 0.0%si, 0.0%st<u></u><u></u></div><div>Mem: 1020400k total, 881004k used, 139396k free, 162632k buffers<u></u><u></u></div><div>Swap: 1835000k total, 14984k used, 1820016k free, 220644k cached<u></u><u></u></div><div><u></u> <u></u></div><div><a rel="nofollow" shape="rect" href="http://imgur.com/blULjDa" target="_blank">http://imgur.com/blULjDa</a> shows the hypervisor panel of Horizon. As you can see, Compute 3 has fewer resources used, but none of the compute nodes should be anywhere near overloaded from
what I can tell.<u></u><u></u></div><div><u></u> <u></u></div><div>Any ideas? Let me know if I’m missing anything obvious that would help with figuring this out! <u></u><u></u></div><div><u></u> <u></u></div><div>Hannah<u></u><u></u></div><div><u></u> <u></u></div><div><u></u> <u></u></div><div><u></u> <u></u></div><div><u></u> <u></u></div></div><br clear="none">
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