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Re: [Xen-users] poor IO performance with dom0 on centos7

Am 2015-09-01 14:14, schrieb Roger Pau MonnÃ:

Can you use fio/iperf (or similar tools) to pin down the issue? Without
knowing which component is causing the performance degradation there's
no way we can provide a solution.

I would recommend to measure network throughput between VMs (satan and
levaithan), between VMs and Dom0 and finally between VMs and another
host on the same network.


ok here the results:

centos 7 dom0 -> centos 7 bare metal
0.0-10.0 sec   952 MBytes   798 Mbits/sec

centos6 domU -> centos 7 bare metal
0.0-10.0 sec   950 MBytes   797 Mbits/sec

centos7 domU -> centos 7 bare metal
0.0-10.0 sec   958 MBytes   804 Mbits/sec

centos 7 dom0 -> centos 6 domU
0.0-10.0 sec  18.1 GBytes  15.5 Gbits/sec

centos 7 domU -> centos 6 domU
0.0-10.0 sec  10.6 GBytes  9.12 Gbits/sec

WTF? thats enough... but why do I see lagging? I mean if I make a tcpdump for my downloads, the I see ever some traffic (2-5s) really fast, then some time nothing then again a lot of pkgs (2-5sec) then delay again etc etc


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