[Sugar-devel] Wanting to know a bit of (NetworkManager) workflow upon resume-from-suspend
pgf at laptop.org
Wed May 2 08:32:45 EDT 2012
> On Wed, May 2, 2012 at 3:22 AM, Ajay Garg <ajaygargnsit at gmail.com> wrote:
> > The /etc/powerd/postresume.d/disable_mesh.sh doesn't work.
> So we need to understand why it does not work. Is it a race condition?
> Perhaps it is better fixed as a udev script -- triggering when the
> device appears.
i think it's almost a guaranteed race. that script essentially
while [ ! -f /sys/class/net/eth0/lbs_mesh ]
echo 0 > /sys/class/net/eth0/lbs_mesh
in other words -- the disable_mesh script will discover the disable
node at just about exactly the time that NM discovers the interface.
there's also the "lbs_disablemesh" module parameter, which could be
supplied at initial module load. does that not work, for some reason?
(i seem to recall there may be a problem with it.)
> The step that disable_mesh performs is very important. If you don't
> disable it at that level, you haven't disabled mesh at all and all the
> problems persist.
> >> - disable mesh on boot
> > Done. Added the 'echo 0' script in 'start()' method of NetworkManager, so
> > that the effect takes place before NetworkManager starts up. Works like a
> > charm.
> Ok. Maybe a udev script is a better place.
> >> - disable mesh on resume, from a powerd-triggered script
> > Does not work, as explained above.
> Right but you MUST find a way to make it work.
> >> - blacklist the MAC address so NM ignores it
> >> you win. Yes, every XO has a different MAC address, but you can read
> >> that on first boot of the OS, and write the NM configuration. See the
> >> olpc-configure script for examples.
> > Would be awesome. I believe this is the one and only complete solution
> > possible :)
> Careful here! This only hides the device from NM so you don't race with NM.
> > Could you point me to the suitable (examples) link? I will be heartfully
> > grateful.
> look at the latest olpc-configure in git://dev.laptop.org/projects/olpc-utils
> martin.langhoff at gmail.com
> martin at laptop.org -- Software Architect - OLPC
> - ask interesting questions
> - don't get distracted with shiny stuff - working code first
> - http://wiki.laptop.org/go/User:Martinlanghoff
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paul fox, pgf at laptop.org
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