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doc/todo/dynamic_stall_detection.mdwn

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+annex.stalldetection lets remotes be configured with a minimum throughput
+to detect and retry stalls. But most users are not going to configure this. 
+Could something be done to dynamically detect a stall, without configuration?
+
+Eg, wait until data starts to flow, and then check if there's at least some
+data being sent each minute. If so, the progress display is being updated
+at least every minute. So then if 2 minutes go by without more data
+flowing, it's almost certainly stalled. And if the progress display is
+updated less frequently, see if it's updated every 2 minutes, etc. Although
+realistically, progress displays are updated every chunk, and there's
+typically more than 1 chunk per minute. So longer durations than 1 minute
+may be an unncessary complication. And a couple of minutes to detect a
+stall is fine.
+
+It may still need a config to turn it on, because running
+transfers in separate processes can lead to more resource use, or even
+password prompting, which could be annoying to existing users. Also, if it
+gets it wrong and the remote does not support resuming transfers,
+defaulting to on could lead to bad waste of resources. It could
+detect stalls even when not turned on, but only display a message
+suggesting enabling the config. --[[Joey]]