Re: [MM] Question regarding minimum probing time in MMPluginManager

[Aleksander Morgado <aleksander lanedo com>]

> > > As always, we're very motivated to shave a second or a few hundred
> > > > > milliseconds off the modem startup time :)
> > > > >
> > > > > I guess a simple solution is to let a plugin specify the max number of
> > > > > ports N, such that the plugin manager will skip the minimum probing
> > > > > time after seeing the completion of N port probes.   A more generic
> > > > > solution would be adding a hook in the plugin to decide whether or not
> > > > > to end the probing process after each port probe finishes.  How do you
> > > > > think?
> > >
> > > Yes, that second option would be cleaner. What I don't know is the
> > > outcome of that generic method. This is, should the method just disable
> > > the minimum probing time? Or should it actually ignore further ongoing
> > > probings (e.g. serial ports being probed for AT or QCDM) once we get the
> > > minimum set of ports we wanted?
> One problem is how the plugin knows that specific ports are primary or
> secondary or what.  You typically don't get this information without
> tagging specific USB interface numbers like Windows does, and even then
> we have had cases of this changing on firmware upgrades.  So I'm not
> sure the generic  method should be too aggressive here, instead I think
> it should be opt-in on a per-plugin or per-device basis.
>
> Only if you're 100% sure about the layout of a specific modem (and we
> have to be very careful that the USB VID/PID aren't re-used bewteen
> different devices like ZTE and Huawei often do) should the current probe
> process be bypassed.

Yeah, that's what I meant with "in very device-specific plugins like the
novatel-lte or altair-lte" in an earlier email. Those plugins cover 1
modem at most, and covering the expected ports in them should be pretty
simple. For modems with multiple ports or port layouts, I don't think
the change would be very useful, as those really will end up having a
probing time much longer than the minimum probing time that you want to
skip.

-- 
Aleksander