[ovs-dev] [PATCH 00/20] Add OVS DPDK keep-alive functionality.

[Aaron Conole]

Bhanuprakash Bodireddy <bhanuprakash.bodireddy at intel.com> writes:

> Keepalive feature is aimed at achieving Fastpath Service Assurance
> in OVS-DPDK deployments. It adds support for monitoring the packet
> processing cores(PMD thread cores) by dispatching heartbeats at regular
> intervals. Incase of heartbeat misses additional health checks are
> enabled on the PMD thread to detect the failure and the same shall be
> reported to higher level fault management systems/frameworks.
>
> The implementation uses OVSDB for reporting the health of the PMD threads.
> Any external monitoring application can read the status from OVSDB at 
> regular intervals (or) subscribe to the updates in OVSDB so that they get
> notified when the changes happen on OVSDB.
>
> keepalive info struct is created and initialized for storing the
> status of the PMD threads. This is initialized by main thread(vswitchd)
> as part of init process and will be periodically updated by 'keepalive'
> thread. keepalive feature can be enabled through below OVSDB settings.
>
>     enable-keepalive=true
>       - Keepalive feature is disabled by default.
>
>     keepalive-interval="5000"
>       - Timer interval in milliseconds for monitoring the packet
>         processing cores.
>
> When KA is enabled, 'ovs-keepalive' thread shall be spawned that wakes
> up at regular intervals to update the timestamp and status of pmd cores
> in keepalive info struct. This information shall be read by vswitchd thread
> and write the status in to 'keepalive' column of Open_vSwitch table in OVSDB.
>
> An external monitoring framework like collectd with ovs events support
> can read (or) subscribe to the datapath status changes in ovsdb. When the state
> is updated, the collectd shall be notified and will eventually relay the status
> to ceilometer service running in the controller. Below is the high level
> overview of deployment model.
>
>     Compute Node            Controller            Compute Node
>
>     Collectd  <----------> Ceilometer <-------->   Collectd
>
>     OvS DPDK                                       OvS DPDK
>
>     +-----+
>     | VM  |
>     +--+--+
>     \---+---/
>     |
>     +--+---+       +------------+----------+     +------+-------+
>     | OVS  |-----> |   ovsevents plugin    | --> |   collectd   |
>     +--+---+       +------------+----------+     +------+-------+
>
>     +------+-----+     +---------------+------------+     |
>     | Ceilometer | <-- | collectd ceilometer plugin |  <---
>     +------+-----+     +---------------+------------+
>
> Performance impact:
>   No noticeable performance or latency impact is observed with
>   KA feature enabled.
>
> -------------------------------------------------

Hi Bhanu,

I had some problems applying this to master.  Can you rebase?

-Aaron