[openstack-dev] [neutron][rootwrap] Performance considerations, sudo?

Miguel Angel Ajo majopela at redhat.com
Fri Mar 21 10:36:14 UTC 2014

On 03/21/2014 11:01 AM, Thierry Carrez wrote:
> Yuriy Taraday wrote:
>> Benchmark included showed on my machine these numbers (average over 100
>> iterations):
>> Running 'ip a':
>>                                                ip a :   4.565ms
>>                                           sudo ip a :  13.744ms
>>                             sudo rootwrap conf ip a : 102.571ms
>>                                  daemon.run('ip a') :   8.973ms
>> Running 'ip netns exec bench_ns ip a':
>>                    sudo ip netns exec bench_ns ip a : 162.098ms
>>      sudo rootwrap conf ip netns exec bench_ns ip a : 268.115ms
>>           daemon.run('ip netns exec bench_ns ip a') : 129.876ms
>> So it looks like running daemon is actually faster than running "sudo".
> That's pretty good! However I fear that the extremely simplistic filter
> rule file you fed on the benchmark is affecting numbers. Could you post
> results from a realistic setup (like same command, but with all the
> filter files normally found on a devstack host ?)
> Thanks,

That's a good point to have a fair comparison to the c translated one,
I ran it with all the rootwrap filters provided in havana, but I will
rerun the benchmark if that changed.

Anyway, I don't think there should be a huge difference, the worst
part was the startup part.

More information about the OpenStack-dev mailing list