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This is a leftover from the implementation's history, but the quic_rx_packet and quic_tx_packet ref counts were still atomically updated. It was found in perf top that the cost of the atomic inc in quic_tx_packet_refinc() alone was responsible for 1% of the CPU usage at 135 Gbps. Given that packets are only processed on their assigned thread we don't need that anymore and this can be replaced with regular non-atomic operations. Doing this alone has reduced the CPU usage of qc_do_build_pkt() from 3.6 to 2.5% and increased the overall bit rate by about 1%.