CPU loading issue

[Marc Murphy]

I am using buildroot 2015.05 using glibc/eglibc
Linaro toolchain gcc-linaro-arm-linux-gnueabihf-4.9-2014.05_linux
Libqmi 1.12.6
MM 1.4.6
3.12 kernel

Same issue is also on buildroot 2014.05


> -----Original Message-----
> From: ModemManager-devel [mailto:modemmanager-devel-
> bounces at lists.freedesktop.org] On Behalf Of David McCullough
> Sent: 11 June 2015 14:19
> To: Marc Murphy
> Cc: 'Dan Williams'; 'modemmanager-devel at lists.freedesktop.org';
> 'Aleksander Morgado'
> Subject: Re: CPU loading issue
> 
> 
> Marc Murphy wrote the following:
> > 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.
> 
> Ok,  I have been running all day with the 1s setting,  no change from my last
> update.  Sitting at 4-6% and only peaking when we are doing other things to
> modem manager.
> 
> I just updated to current master for libqmi and ModemManager just to be
> sure,  so far its working the same,  will see if it holds up over more than
> 30 minutes.
> 
> What sort of build env are you using for your system ?
> 
> I am running linux 3.10/uClibc built with gcc version 4.8.3. Latest modem
> manager,  latest libqmi,  linux native threads (uClibc), not sure what else
> might make a difference here.
> 
> Cheers,
> Davidm
> 
> 
> >
> > 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
> > > _______________________________________________
> > > ModemManager-devel mailing list
> > > ModemManager-devel at lists.freedesktop.org
> > > http://lists.freedesktop.org/mailman/listinfo/modemmanager-devel
> 
> --
> David McCullough,  david.mccullough at accelecon.com,   Ph: 0410 560 763
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