#10363 NORM 10.1.3: Auto-Suspend gets in the way when sharing over Salut
tomeu at tomeuvizoso.net
Thu Sep 23 08:39:01 EDT 2010
On Mon, Sep 20, 2010 at 12:56, Paul Fox <pgf at laptop.org> wrote:
> tomeu wrote:
> > On Thu, Sep 16, 2010 at 23:38, Martin Langhoff
> > <martin.langhoff at gmail.com> wrote:
> > > On Thu, Sep 16, 2010 at 5:05 AM, Tomeu Vizoso <tomeu at tomeuvizoso.net> wrote:
> > >> So the problem is that if you had to resync all state for each machine
> > >> every time they wake up, you would use lots of bandwidth with the
> > > (...)
> > >> Another issue with this is that you not only want to resync presence,
> > >> but shared activities also would need to resync their state.
> > >
> > > Correct. My notes on the bug are probably unreadable -- it was late
> > > last night, apologies.
> > >
> > > What I mean to say is that we could
> > >
> > > 1 - explore the interaction between sleep timeouts and Salut resync
> > > frequency for presence
> > >
> > > 2 - hack the Tubes/Telepathy stack to _prevent sleep_ while an actual
> > > collaboration session is running
> > >
> > > I think #1 needs to be done regardless, as it'll improve behaviour
> > > even if/when we our networking/suspend issues sorted. And some of the
> > > issues in network/suspend interaction won't be easy to resolve.
> > I doubt there's much that can be done in Salut about it, should be
> > instead done inside Avahi. I would see how mDNS works, then look for
> > opportunities of tuning knobs in Avahi to speed up rediscovery:
> > http://tools.ietf.org/html/draft-ietf-dnsext-mdns-47
> > I'm going to ask around in case somebody has already thought of it and
> > can provide a shortcut.
> the laptop knows how long it was suspended, and this information could
> be made available to a resume hook (which almost exists, but not
> quite, in powerd) if it would be useful. i.e., a a post-resume script
> could decide whether to kick the protocols to do something differently,
> if that was needed.
Pinged Lennart in #fedora-desktop and he said that if avahi isn't
trying harder to update its state after resuming it's because there
isn't a decent hook for that in Linux yet.
I couldn't get from him any other useful information, but maybe this
is a chance to explore ways in which Avahi can update itself faster
after sleep? If there's interest, I think this should be moved to the
> paul fox, pgf at laptop.org
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