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| sai | ilyashakhat: ping | 13:13 |
|---|---|---|
| ilyashakhat | sai, hi! | 13:22 |
| sai | been able to get shaker external scenarios to work after struggling with friewalld and iptables, however tcp upload is representative of actual throughput but download is around 2Mbps which cant be true | 13:23 |
| sai | any idea why a situation like this arises/how to debug | 13:24 |
| sai | btw thanks for merging my patches | 13:24 |
| ilyashakhat | thanks for pointing to tricky issue with Heat :) | 13:25 |
| ilyashakhat | I would check whether packets get fragmented on the way | 13:25 |
| ilyashakhat | checksums and offloading parameters may impact too | 13:27 |
| sai | rgr, thanks | 13:29 |
| sai | i also raised an upstream issue with flent asking for a newer version | 13:29 |
| sai | so we have more scenarios for shaker soon | 13:29 |
| sai | :) | 13:29 |
| ilyashakhat | cool :) | 13:29 |
| sai | especially wrt tuning number of netperf threads | 13:29 |
| ilyashakhat | btw, on one of our labs we've observed https://bugs.launchpad.net/mos/+bug/1593752 | 13:32 |
| openstack | Launchpad bug 1593752 in Mirantis OpenStack 10.0.x "Low network performance in Shaker north-south scenario" [High,Confirmed] - Assigned to MOS Neutron (mos-neutron) | 13:32 |
| ilyashakhat | the issue affects modern Intel cards and got fixed by disabling some of hardware offloading modes | 13:33 |
| sai | ah thanks for the pointer, but this both VMs in the cloud | 13:35 |
| sai | not the external scenario right | 13:35 |
| sai | ilyashakhat: also the flow of traffic for upload is master->slave and for download is slave->master | 13:36 |
| sai | correct? | 13:36 |
| ilyashakhat | right | 13:37 |
| sai | ilyashakhat: also fyi, in my tests with DVR and N-S for instances without floating ip i was seeing throughput around 200-300Mbps which is extremely low on a 1gig nic | 13:37 |
| sai | this is for tcp download so slave is accesssing master over fixed ip | 13:37 |
| sai | not sure if i should BZ that as low perf | 13:38 |
| ilyashakhat | what is N-S witout floating IP? there will be at least one on the slave | 13:38 |
| ilyashakhat | and the traffic will go from compute via network node via external switch and directly to compute | 13:39 |
| ilyashakhat | (in Fuel/MOS) | 13:39 |
| sai | ilyashakhat: but when traffic is going from slave which has fip to a master without a fip, i thought the case would be the same as two vms accessing each other with fixed ip | 13:40 |
| sai | no? | 13:40 |
| sai | in the case of tcp download slave->master | 13:41 |
| ilyashakhat | no, both download and upload go via the same connection, the difference that is the latter case requests much longer than response | 13:42 |
| ilyashakhat | this is similar to usual NAT-ed connection | 13:42 |
| ilyashakhat | regarding 200-300 mbs -- do you observe this with concurrency =1? | 13:43 |
| sai | yup, all my tests start usually with 1 concurrency..havent dug into increasing concurrency | 13:45 |
| sai | i need to bump up concurrency and see | 13:45 |
| sai | ok so my understanding was wrong, just to confirm whenever a VM has floating ip and accesses any VM which doesnt have a floating ip the traffic flow is same as the VM accessing external | 13:47 |
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