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8098be1fdc
Pacing algorithm has been revamped in the previous commit to implement a credit based solution. This is a far more adaptative solution, in particular which allow to catch up in case pause between pacing emission was longer than expected. This allows QMUX to remove the active loop based on tasklet wake-up. Instead, a new task is used when emission should be paced. The main advantage is that CPU usage is drastically reduced. New pacing task timer is reset each time qcc_io_send() is invoked. Timer will be set only if pacing engine reports that emission must be interrupted. In this case timer is set via qcc_wakeup_pacing() to the delay reported by congestion algorithm, or 1ms if delay is too short. At the end of qcc_io_cb(), pacing task is queued if timer has been set. Pacing task execution is simple enough : it immediately wakes up QCC I/O handler. Note that to have decent performance, it requires to have a large enough burst defined in configuration of quic-cc-algo. However, this value is common to every listener clients, which may cause too much loss under network conditions. This will be address in a future patch. This should be backported up to 3.1.
