Re: [PATCH v9 net-next 2/7] net: add low latency socket poll

[Eliezer Tamir]

On 05/06/2013 18:39, Eric Dumazet wrote:
> On Wed, 2013-06-05 at 18:30 +0300, Eliezer Tamir wrote:
> > On 05/06/2013 18:21, Eric Dumazet wrote:

> > > It would also make sense to give end_time as a parameter, so that the
> > > polling() code could really give  a end_time for the whole duration of
> > > poll().
> > >
> > > (You then should test can_poll_ll(end_time) _before_ call to
> > > ndo_ll_poll())
> >
> > how would you handle a nonblocking operation in that case?
> > I guess if we have a socket option, then we don't need to handle none
> > blocking any diffrent, since the user specified exactly how much time to
> > waste polling. right?
>
> If the thread already spent 50us in the poll() system call, it for sure
> should not call any ndo_ll_poll(). This makes no more sense at this
> point.

what about a non-blocking read from a socket?
Right now we assume this means poll only once since the application will 
repeat as needed.

maybe add a "once" parameter that will cause sk_poll_ll() to ignore end 
time and only try once?
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