#10363 NORM 10.1.3: Auto-Suspend gets in the way when sharing over Salut

Paul Fox pgf at laptop.org
Mon Sep 20 06:56:45 EDT 2010

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.

 paul fox, pgf at laptop.org

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