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todo: add some notes about tablet/mobile optimizations we should do
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TODO
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TODO
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@ -495,3 +495,34 @@ a bridge or bond and shouldn't be automatically started by NetworkManager or
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displayed as separate connections in the user interface.
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TO BE CONTINUED
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* Better Tablet/Mobile Behavior
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There are a few components to this:
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1) kernel driver and hardware capabilities: most mobile devices use periodic
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background scanning to quickly determine whether a known SSID is available and
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notify the connection manager to connect to it. This typically requires special
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capabilities and good powersave/sleep support from the WiFi kernel driver.
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There is a background scanning API in nl80211, but we need to determine how many
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SSIDs each driver allows for background scanning, and based on that number, give
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the driver the most recent N SSIDs. We still need to periodically wake the
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device up and do a full scan just in case the user is near a known SSID that was
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not in the N top recently used networks. This is also beneficial to normal
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desktop use-cases.
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2) single-device-at-a-time with overlapping connections: this is also probably
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the best route to go for desktop use-cases as well. Instead of bringing all
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available connections up, only bring up the "best" connection at any given
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time based on the current priority list (which is rougly Ethernet > WiFi >
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3G/Bluetooth/WiMAX). However, to ensure seamless connectivity, when one
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connection begins to degrade, the next-best connection should be started before
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the current one is terminated, such that there is a small amount of overlap.
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Consequently the same behavior should be used when a better connection becomes
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available. This behavior should be suspended when special connections like
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Internet Connection Sharing ones are started, where clearly the priorities
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are different (ie, for Mobile Hotspot 3G > WiFi).
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