Hi, thanks, I think that is exactly what I am looking for, I will try the commands that you mentioned.
BR /Tobias On 30 August 2017 at 17:54, Damjan Marion (damarion) <damar...@cisco.com> wrote: > > On 30 Aug 2017, at 13:59, Tobias Sundqvist <tobias.sundqv...@tieto.com> > wrote: > > Hi I guess the silence tells that there are no way of dynamically scale > the number of cores used by VPP when VPP already has started. > If anyone has any idea if it is dynamically possible to change the way the > cores is used just send me an email. Perhaps it could be possible to assign > a certain core to not poll the interface or something similar, then the > core would still be in use of VPP but the CPU load would go down. > > BR /Tobias > > On 24 August 2017 at 10:36, Tobias Sundqvist <tobias.sundqv...@tieto.com> > wrote: > >> Hi we are building an application that uses vpp and when I have some >> questions that concerns multi core usage. >> >> In the run that we are doing now we are using 4 cores and we use some >> DPDK polling of an interface which makes the cpu load go 100% on all cores. >> We are interested in energy consumption in the application we are creating >> and would like to be able to scale up and down the cpu usage during runtime. >> >> Is it possible to dynamically change the number of cores used by VPP or >> specify somehow which cores that are used for polling of an certain >> interface during runtime? >> >> During low and high traffic we would like to scale up and down the amount >> of cores that is used. >> >> If the polling is causing the cpu to go to 100% would it help using >> Turboboost and Speedstep, would it actually lower the frequency when the >> traffic is low? >> >> BR /Tobias >> > > > I did some work to enable interrupt mode with DPDK devices, but it is a > bit hacky (it is digging some data form dpdk internal structures) > so it is not published. Together with adaptive interrupt/polling mode > which VPP supports it might be solution to your problem. > > Please note that you can define today which worker is poling which > interface, so you can effectively remove all interfaces form specific core > ant that core should go to sleep. > This works on runtime without the need to switch interface off so it can > also be a way to address your problem. > > See “set interface rx-placement / show interface rx-placement” commands > for details… > > Thanks, > > Damjan > > >
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