Re: [PATCH net-next 3/3] tipc: reduce transmission rate of reset messages when link is down

[Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>]

Hello.

On 04/05/2016 07:20 PM, Jon Maloy wrote:

> When a link is down, it will continuously try to re-establish contact
> with the peer by sending out a RESET or and ACTIVATE message at each

    And/or?

> timeout interval. The default value for this interval is currently
> 375 ms. This is wasteful, and may become a problem in very large
> clusters with dozens or hundereds of nodes being down simultaneously.

    Hundreds.

> We now introduce a simple backoff algorithm for these cases. The
> first five messages are sent at default rate; thereafter a message
> is sent only each 16't timer interval.

    16th?

> This will cover the vast majority of link recyling cases, since the

    Recycling.

> endpoint starting last will transmit at the higher speed, and the link
> should normally be established well be before the rate needs to be
> reduced.
>
> The only case where we will see a degradation of link re-establishment
> is when the endpoins remain intact, and a glitch in the transmission

    Endpoints.

> media is causing the link reset. We will then experience a worst-case
> re-establishing time of 6 seconds, something we deem acceptable.
>
> Acked-by: Ying Xue <ying.xue@windriver.com>
> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
[...]

MBR, Sergei