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Jean-Philippe Méthot writes:
> This particular message makes it sound as if openvswitch is getting overloaded.
> Sep 23 03:54:08 network1 ovsdb-server: ovs|01253|reconnect|ERR|tcp:127.0.0.1:50814: no response to inactivity probe after 5.01 seconds, disconnecting

We get these as well :-(

> A lot of those keep appear, and openvswitch always reconnects almost
> instantly though. I’ve done some research about that particular
> message, but it didn’t give me anything I can use to fix it.

Would be interested in solutions as well.  But I'm sceptical whether
kernel settings can help here, because the timeout/slowness seems to be
located in the user-space/control-plane parts of Open vSwitch,
i.e. OVSDB.
-- 
Simon.

> Jean-Philippe Méthot
> Openstack system administrator
> Administrateur système Openstack
> PlanetHoster inc.

>  Le 25 sept. 2018 à 19:37, Erik McCormick <emccormick at cirrusseven.com> a écrit :

>  Ate you getting any particular log messages that lead you to conclude your issue lies with OVS? I've hit lots of kernel limits under those conditions before OVS itself ever
>  noticed. Anything in dmesg, journal or neutron logs of interest? 

>  On Tue, Sep 25, 2018, 7:27 PM Jean-Philippe Méthot <jp.methot at planethoster.info> wrote:

>  Hi,

>  Are there some recommendations regarding kernel settings configuration for openvswitch? We’ve just been hit by what we believe may be an attack of some kind we
>  have never seen before and we’re wondering if there’s a way to optimize our network nodes kernel for openvswitch operation and thus minimize the impact of such an
>  attack, or whatever it was.

>  Best regards,

>  Jean-Philippe Méthot
>  Openstack system administrator
>  Administrateur système Openstack
>  PlanetHoster inc.

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