CPU loading issue

[Marc Murphy]

My system is based on an AM3359 (BBB) running at 1GHz so should be able to cope with the 
GPS stream.

If I use gdbserver and attach to MM, when the loading is getting really high I can pause 
the process and the loading instantly drops.  If I wait a couple of seconds and resume the
loading drops to a reasonable level and then slowly creeps up again.

Is there any timestamp logging that I can enable in a similar way to Gstreamer debug ?

Cheers
Marc

> -----Original Message-----
> From: ModemManager-devel [mailto:modemmanager-devel-
> bounces at lists.freedesktop.org] On Behalf Of David McCullough
> Sent: 11 June 2015 02:45
> To: Aleksander Morgado
> Cc: Dan Williams; modemmanager-devel at lists.freedesktop.org; Marc
> Murphy
> Subject: Re: CPU loading issue
> 
> 
> Aleksander Morgado wrote the following:
> > On Wed, Jun 10, 2015 at 4:30 PM, David McCullough
> > <david.mccullough at accelecon.com> wrote:
> > >> > I am using an embedded platform and after a bit of fiddling I have built
> the package and used it.
> > >> >
> > >> > Trace attached.
> > >>
> > >> Thanks; that gets us further since the two functions that are
> > >> getting called all the time are "match" and "pcre_exec".
> > >> Unfortunately that doesn't tell us *which* regex this is...  Aleksander,
> any ideas?
> > >
> > > Remember Marc has modded the GPS to send data every second.
> Maybe
> > > the Huawei is sending more info per second than other modesm are
> sending ?
> > >
> > > IIRC the GPS (NMEA?) dumps comes in on 2 of the USB tty ports,  both
> > > of which MM is watching.  The incoming data is parsed using the
> > > modem manager pattern matching,  thus the match/pcre stuff you see.
> > >
> > > The GPS data can be fairly verbose from memory,  depending on
> > > numbers of satelites etc,  maybe we are just getting too much ?  I
> > > am not and expert on the GPS data so I really can't say.  Perhaps
> > > the combination of all modem chitchat is just queuing up and modem
> manager is getting behind ?
> > >
> > > I have a 400MHz ARM that I have been running the MU609 in for the last
> day.
> > > It polls at the default 30 seconds and is still running at 0%
> > > popping up to 5-6% every now and then.
> >
> > Could you maybe set the same 1s update in the MU609 and see if MM
> > behaves worse in the same board?
> 
> Running now,  no signs yet.
> 
> CPU is higher, always 4-6%, will see how it goes over time.
> 
> Cheers,
> Davidm
> 
> --
> David McCullough,  david.mccullough at accelecon.com,   Ph: 0410 560 763
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