<div dir="ltr"><div class="gmail_default" style="font-family:'courier new',monospace;font-size:small;color:rgb(0,0,0)">Well, its been a long time since we use nova with KVM, we got over the many thousand vms, and still, something doesnt feel right.</div>
<div class="gmail_default" style="font-family:'courier new',monospace;font-size:small;color:rgb(0,0,0)">We are using ubuntu 12.04 kernel 3.2.0-[40-48], tuned sysctl with lots of parameters, and everything ... works, you can say, quite well.</div>
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But here's the deal, we have an special networking scenario that is, EVERYTHING IS APIS, everything is throughput, no bandwidth.</div><div class="gmail_default" style="font-family:'courier new',monospace;font-size:small;color:rgb(0,0,0)">
Every 2x1Gb bonded compute node, doesnt get over the [200Mb/s - 400Mb/s] but its handling hundreds of thousands requests per minute to the vms.</div><div class="gmail_default" style="font-family:'courier new',monospace;font-size:small;color:rgb(0,0,0)">
<br></div><div class="gmail_default" style="font-family:'courier new',monospace;font-size:small;color:rgb(0,0,0)">And once in a while, gives you the sensation that everything goes to hell, timeouts from aplications over there, response times from apis going from 10ms to 200ms over there, 20ms delays happening between the vm ETH0 and the VNET interface, etc.</div>
<div class="gmail_default" style="font-family:'courier new',monospace;font-size:small;color:rgb(0,0,0)">So, since its a massive scenario to tune, we never kinda, nailedon WHERE TO give this 1, 2 or 3 final buffer/ring/affinity tune to make everything work from the compute side.</div>
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I know its a little awkward, but im craving, and jaunting for community real life examples regarding "HIGH THROUGHPUT" tuning with KVM scenarios, dark linux or if someone can help me go through configurations that might sound weird / unnecesary / incorrect.</div>
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For those who are wondering, well ... i dont know what you have, lets start with this.</div><div class="gmail_default" style="font-family:'courier new',monospace;font-size:small;color:rgb(0,0,0)"><br></div><div class="gmail_default" style="font-family:'courier new',monospace;font-size:small;color:rgb(0,0,0)">
COMPUTE NODES (99% of them, different vendors, but ...)</div><div class="gmail_default" style="font-family:'courier new',monospace;font-size:small;color:rgb(0,0,0)">* 128/256 GB of ram</div><div class="gmail_default" style="font-family:'courier new',monospace;font-size:small;color:rgb(0,0,0)">
* 2 hexacores with HT enabled</div><div class="gmail_default" style="font-family:'courier new',monospace;font-size:small;color:rgb(0,0,0)">* 2x1Gb bonded interfaces (want to know the more than 20 models we are using, just ask for it)</div>
<div class="gmail_default" style="font-family:'courier new',monospace;font-size:small;color:rgb(0,0,0)">* Multi queue interfaces, pined via irq to different cores</div><div class="gmail_default" style="font-family:'courier new',monospace;font-size:small;color:rgb(0,0,0)">
* ubuntu 12.04 kernel 3.2.0-[40-48]</div><div class="gmail_default" style="font-family:'courier new',monospace;font-size:small;color:rgb(0,0,0)">* Linux bridges, no VLAN, no open-vswitch</div><div class="gmail_default" style="font-family:'courier new',monospace;font-size:small;color:rgb(0,0,0)">
<br></div><div class="gmail_default" style="font-family:'courier new',monospace;font-size:small;color:rgb(0,0,0)">I want to try to keep the networking appliances ( TOR's, AGGR, CORES ) as out of the picture as possible.</div>
<div class="gmail_default" style="font-family:'courier new',monospace;font-size:small;color:rgb(0,0,0)">im thinking "i hope this thread gets great, in time"</div><div class="gmail_default" style="font-family:'courier new',monospace;font-size:small;color:rgb(0,0,0)">
<br></div><div class="gmail_default" style="font-family:'courier new',monospace;font-size:small;color:rgb(0,0,0)">So, ready to learn as much as i can.</div><div class="gmail_default" style="font-family:'courier new',monospace;font-size:small;color:rgb(0,0,0)">
Thank you openstack community, as allways.</div><div class="gmail_default" style="font-family:'courier new',monospace;font-size:small;color:rgb(0,0,0)"><br></div><div class="gmail_default" style="font-family:'courier new',monospace;font-size:small;color:rgb(0,0,0)">
alejandrito</div><div><br></div>
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