Index: net/quic/congestion_control/hybrid_slow_start.h |
diff --git a/net/quic/congestion_control/hybrid_slow_start.h b/net/quic/congestion_control/hybrid_slow_start.h |
deleted file mode 100644 |
index dbd440dffb543b9881babe843975d12e44c176d4..0000000000000000000000000000000000000000 |
--- a/net/quic/congestion_control/hybrid_slow_start.h |
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-// Copyright (c) 2012 The Chromium Authors. All rights reserved. |
-// Use of this source code is governed by a BSD-style license that can be |
-// found in the LICENSE file. |
-// |
-// This class is a helper class to TcpCubicSender. |
-// Slow start is the initial startup phase of TCP, it lasts until first packet |
-// loss. This class implements hybrid slow start of the TCP cubic send side |
-// congestion algorithm. The key feaure of hybrid slow start is that it tries to |
-// avoid running into the wall too hard during the slow start phase, which |
-// the traditional TCP implementation does. |
-// This does not implement ack train detection because it interacts poorly with |
-// pacing. |
-// http://netsrv.csc.ncsu.edu/export/hybridstart_pfldnet08.pdf |
-// http://research.csc.ncsu.edu/netsrv/sites/default/files/hystart_techreport_2008.pdf |
- |
-#ifndef NET_QUIC_CONGESTION_CONTROL_HYBRID_SLOW_START_H_ |
-#define NET_QUIC_CONGESTION_CONTROL_HYBRID_SLOW_START_H_ |
- |
-#include <stdint.h> |
- |
-#include "base/macros.h" |
-#include "net/base/net_export.h" |
-#include "net/quic/quic_protocol.h" |
-#include "net/quic/quic_time.h" |
- |
-namespace net { |
- |
-class NET_EXPORT_PRIVATE HybridSlowStart { |
- public: |
- HybridSlowStart(); |
- |
- void OnPacketAcked(QuicPacketNumber acked_packet_number); |
- |
- void OnPacketSent(QuicPacketNumber packet_number); |
- |
- // ShouldExitSlowStart should be called on every new ack frame, since a new |
- // RTT measurement can be made then. |
- // rtt: the RTT for this ack packet. |
- // min_rtt: is the lowest delay (RTT) we have seen during the session. |
- // congestion_window: the congestion window in packets. |
- bool ShouldExitSlowStart(QuicTime::Delta rtt, |
- QuicTime::Delta min_rtt, |
- QuicPacketCount congestion_window); |
- |
- // Start a new slow start phase. |
- void Restart(); |
- |
- // TODO(ianswett): The following methods should be private, but that requires |
- // a follow up CL to update the unit test. |
- // Returns true if this ack the last packet number of our current slow start |
- // round. |
- // Call Reset if this returns true. |
- bool IsEndOfRound(QuicPacketNumber ack) const; |
- |
- // Call for the start of each receive round (burst) in the slow start phase. |
- void StartReceiveRound(QuicPacketNumber last_sent); |
- |
- // Whether slow start has started. |
- bool started() const { return started_; } |
- |
- private: |
- // Whether a condition for exiting slow start has been found. |
- enum HystartState { |
- NOT_FOUND, |
- DELAY, // Too much increase in the round's min_rtt was observed. |
- }; |
- |
- // Whether the hybrid slow start has been started. |
- bool started_; |
- HystartState hystart_found_; |
- // Last packet number sent which was CWND limited. |
- QuicPacketNumber last_sent_packet_number_; |
- |
- // Variables for tracking acks received during a slow start round. |
- QuicPacketNumber end_packet_number_; // End of the receive round. |
- uint32_t rtt_sample_count_; // Number of rtt samples in the current round. |
- QuicTime::Delta current_min_rtt_; // The minimum rtt of current round. |
- |
- DISALLOW_COPY_AND_ASSIGN(HybridSlowStart); |
-}; |
- |
-} // namespace net |
- |
-#endif // NET_QUIC_CONGESTION_CONTROL_HYBRID_SLOW_START_H_ |