Re: [PATCH] VNIF: Using smart polling instead of event notification.

[Paul Durrant <paul.durrant@citrix.com>]

Xu, Dongxiao wrote:
>     We found that the event notification frequency is still high in some network cases. NAPI polls only for a little
> time slot and does not efficient enough in our backend/frontend case. Actually our patch repeated calling NAPI
> interface to do more polling, and netback will NOT notify netfront during this period. Once netfront polling out
> all the data, and finds that there is no more data arrive/send during the next 100ms, the timer will stop working 
> to end the polling. 
>     This filed 'smart_poll_active' is shared by netfront and netback, to indicate whether netfront is polling data. 
> So this filed is necessary for netback to notify netfront if this flag is not set. 
> This field is different from the flag in xenstore, which indicates whether other-end has this new feature. If other-end doesn't support the new feature, everything goes in the original way. 
> 

If you want to prevent event notification, why not simply mask out your 
port?

   Paul