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A Discrete-Event Network Simulator
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API |
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A Discrete-Event Network Simulator
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API |
A RED packet queue. More...
#include "red-queue.h"
Inheritance diagram for ns3::RedQueue: Collaboration diagram for ns3::RedQueue:Classes | |
| struct | Stats |
| Stats. More... | |
Public Types | |
| enum | { DTYPE_NONE, DTYPE_FORCED, DTYPE_UNFORCED } |
| Drop types. More... | |
| Public Types inherited from ns3::Queue | |
| enum | QueueMode { QUEUE_MODE_PACKETS, QUEUE_MODE_BYTES } |
| Enumeration of the modes supported in the class. More... | |
Public Member Functions | |
| RedQueue () | |
| RedQueue Constructor. More... | |
| virtual | ~RedQueue () |
| Destructor. More... | |
| int64_t | AssignStreams (int64_t stream) |
| Assign a fixed random variable stream number to the random variables used by this model. More... | |
| RedQueue::QueueMode | GetMode (void) |
| Get the encapsulation mode of this queue. More... | |
| uint32_t | GetQueueSize (void) |
| Get the current value of the queue in bytes or packets. More... | |
| Stats | GetStats () |
| Get the RED statistics after running. More... | |
| void | SetMode (RedQueue::QueueMode mode) |
| Set the operating mode of this queue. More... | |
| void | SetQueueLimit (uint32_t lim) |
| Set the limit of the queue. More... | |
| void | SetTh (double minTh, double maxTh) |
| Set the thresh limits of RED. More... | |
| Public Member Functions inherited from ns3::Queue | |
| Queue () | |
| virtual | ~Queue () |
| Ptr< Packet > | Dequeue (void) |
| Remove a packet from the front of the Queue. More... | |
| void | DequeueAll (void) |
| Flush the queue. More... | |
| bool | Enqueue (Ptr< Packet > p) |
| Place a packet into the rear of the Queue. More... | |
| uint32_t | GetNBytes (void) const |
| uint32_t | GetNPackets (void) const |
| uint32_t | GetTotalDroppedBytes (void) const |
| uint32_t | GetTotalDroppedPackets (void) const |
| uint32_t | GetTotalReceivedBytes (void) const |
| uint32_t | GetTotalReceivedPackets (void) const |
| bool | IsEmpty (void) const |
| Ptr< const Packet > | Peek (void) const |
| Get a copy of the item at the front of the queue without removing it. More... | |
| void | ResetStatistics (void) |
| Resets the counts for dropped packets, dropped bytes, received packets, and received bytes. More... | |
| Public Member Functions inherited from ns3::Object | |
| Object () | |
| Constructor. More... | |
| virtual | ~Object () |
| Destructor. More... | |
| void | AggregateObject (Ptr< Object > other) |
| Aggregate two Objects together. More... | |
| void | Dispose (void) |
| Dispose of this Object. More... | |
| AggregateIterator | GetAggregateIterator (void) const |
| Get an iterator to the Objects aggregated to this one. More... | |
| virtual TypeId | GetInstanceTypeId (void) const |
| Implement the GetInstanceTypeId method defined in ObjectBase. More... | |
| template<typename T > | |
| Ptr< T > | GetObject (void) const |
| Get a pointer to the requested aggregated Object. More... | |
| template<typename T > | |
| Ptr< T > | GetObject (TypeId tid) const |
| Get a pointer to the requested aggregated Object by TypeId. More... | |
| void | Initialize (void) |
| Invoke DoInitialize on all Objects aggregated to this one. More... | |
| Public Member Functions inherited from ns3::SimpleRefCount< Object, ObjectBase, ObjectDeleter > | |
| SimpleRefCount () | |
| Constructor. More... | |
| SimpleRefCount (const SimpleRefCount &o) | |
| Copy constructor. More... | |
| uint32_t | GetReferenceCount (void) const |
| Get the reference count of the object. More... | |
| SimpleRefCount & | operator= (const SimpleRefCount &o) |
| Assignment. More... | |
| void | Ref (void) const |
| Increment the reference count. More... | |
| void | Unref (void) const |
| Decrement the reference count. More... | |
| Public Member Functions inherited from ns3::ObjectBase | |
| virtual | ~ObjectBase () |
| Virtual destructor. More... | |
| void | GetAttribute (std::string name, AttributeValue &value) const |
| Get the value of an attribute, raising fatal errors if unsuccessful. More... | |
| bool | GetAttributeFailSafe (std::string name, AttributeValue &value) const |
| Get the value of an attribute without raising erros. More... | |
| void | SetAttribute (std::string name, const AttributeValue &value) |
| Set a single attribute, raising fatal errors if unsuccessful. More... | |
| bool | SetAttributeFailSafe (std::string name, const AttributeValue &value) |
| Set a single attribute without raising errors. More... | |
| bool | TraceConnect (std::string name, std::string context, const CallbackBase &cb) |
| Connect a TraceSource to a Callback with a context. More... | |
| bool | TraceConnectWithoutContext (std::string name, const CallbackBase &cb) |
| Connect a TraceSource to a Callback without a context. More... | |
| bool | TraceDisconnect (std::string name, std::string context, const CallbackBase &cb) |
| Disconnect from a TraceSource a Callback previously connected with a context. More... | |
| bool | TraceDisconnectWithoutContext (std::string name, const CallbackBase &cb) |
| Disconnect from a TraceSource a Callback previously connected without a context. More... | |
Static Public Member Functions | |
| static TypeId | GetTypeId (void) |
| Get the type ID. More... | |
| Static Public Member Functions inherited from ns3::Queue | |
| static TypeId | GetTypeId (void) |
| Get the type ID. More... | |
| Static Public Member Functions inherited from ns3::Object | |
| static TypeId | GetTypeId (void) |
| Register this type. More... | |
| Static Public Member Functions inherited from ns3::SimpleRefCount< Object, ObjectBase, ObjectDeleter > | |
| static void | Cleanup (void) |
| Noop. More... | |
| Static Public Member Functions inherited from ns3::ObjectBase | |
| static TypeId | GetTypeId (void) |
| Get the type ID. More... | |
Private Member Functions | |
| double | CalculatePNew (double qAvg, double, bool gentle, double vA, double vB, double vC, double vD, double maxP) |
| Returns a probability using these function parameters for the DropEarly function. More... | |
| virtual Ptr< Packet > | DoDequeue (void) |
| Pull a packet from the queue. More... | |
| virtual bool | DoEnqueue (Ptr< Packet > p) |
| Push a packet in the queue. More... | |
| virtual Ptr< const Packet > | DoPeek (void) const |
| Peek the front packet in the queue. More... | |
| uint32_t | DropEarly (Ptr< Packet > p, uint32_t qSize) |
| Check if packet p needs to be dropped due to probability mark. More... | |
| double | Estimator (uint32_t nQueued, uint32_t m, double qAvg, double qW) |
| Compute the average queue size. More... | |
| void | InitializeParams (void) |
| Initialize the queue parameters. More... | |
| double | ModifyP (double p, uint32_t count, uint32_t countBytes, uint32_t meanPktSize, bool wait, uint32_t size) |
| Returns a probability using these function parameters for the DropEarly function. More... | |
Private Attributes | |
| uint32_t | m_bytesInQueue |
| bytes in the queue More... | |
| uint32_t | m_cautious |
| 0 for default RED 1 experimental (see red-queue.cc) 2 experimental (see red-queue.cc) 3 use Idle packet size in the ptc More... | |
| uint32_t | m_count |
| Number of packets since last random number generation. More... | |
| uint32_t | m_countBytes |
| Number of bytes since last drop. More... | |
| double | m_curMaxP |
| Current max_p. More... | |
| bool | m_hasRedStarted |
| True if RED has started. More... | |
| uint32_t | m_idle |
| 0/1 idle status More... | |
| uint32_t | m_idlePktSize |
| Avg pkt size used during idle times. More... | |
| Time | m_idleTime |
| Start of current idle period. More... | |
| bool | m_isGentle |
| True to increases dropping prob. More... | |
| bool | m_isNs1Compat |
| Ns-1 compatibility. More... | |
| bool | m_isWait |
| True for waiting between dropped packets. More... | |
| DataRate | m_linkBandwidth |
| Link bandwidth. More... | |
| Time | m_linkDelay |
| Link delay. More... | |
| double | m_lInterm |
| The max probability of dropping a packet. More... | |
| double | m_maxTh |
| Max avg length threshold (bytes), should be >= 2*minTh. More... | |
| uint32_t | m_meanPktSize |
| Avg pkt size. More... | |
| double | m_minTh |
| Min avg length threshold (bytes) More... | |
| QueueMode | m_mode |
| Mode (Bytes or packets) More... | |
| uint32_t | m_old |
| 0 when average queue first exceeds threshold More... | |
| std::list< Ptr< Packet > > | m_packets |
| packets in the queue More... | |
| double | m_ptc |
| packet time constant in packets/second More... | |
| double | m_qAvg |
| Average queue length. More... | |
| uint32_t | m_queueLimit |
| Queue limit in bytes / packets. More... | |
| double | m_qW |
| Queue weight given to cur queue size sample. More... | |
| Stats | m_stats |
| RED statistics. More... | |
| Ptr< UniformRandomVariable > | m_uv |
| rng stream More... | |
| double | m_vA |
| 1.0 / (m_maxTh - m_minTh) More... | |
| double | m_vB |
| -m_minTh / (m_maxTh - m_minTh) More... | |
| double | m_vC |
| (1.0 - m_curMaxP) / m_maxTh - used in "gentle" mode More... | |
| double | m_vD |
| 2.0 * m_curMaxP - 1.0 - used in "gentle" mode More... | |
| double | m_vProb |
| Prob. More... | |
| double | m_vProb1 |
| Prob. More... | |
Additional Inherited Members | |
| Protected Member Functions inherited from ns3::Queue | |
| void | Drop (Ptr< Packet > packet) |
| Drop a packet. More... | |
| Protected Member Functions inherited from ns3::Object | |
| Object (const Object &o) | |
| Copy an Object. More... | |
| virtual void | DoDispose (void) |
| Destructor implementation. More... | |
| virtual void | DoInitialize (void) |
| Initialize() implementation. More... | |
| virtual void | NotifyNewAggregate (void) |
| Notify all Objects aggregated to this one of a new Object being aggregated. More... | |
| Protected Member Functions inherited from ns3::ObjectBase | |
| void | ConstructSelf (const AttributeConstructionList &attributes) |
| Complete construction of ObjectBase; invoked by derived classes. More... | |
| virtual void | NotifyConstructionCompleted (void) |
| Notifier called once the ObjectBase is fully constructed. More... | |
| Protected Attributes inherited from ns3::Queue | |
| uint32_t | m_nBytes |
| Number of bytes in the queue. More... | |
| uint32_t | m_nPackets |
| Number of packets in the queue. More... | |
| uint32_t | m_nTotalDroppedBytes |
| Total dropped bytes. More... | |
| uint32_t | m_nTotalDroppedPackets |
| Total dropped packets. More... | |
| uint32_t | m_nTotalReceivedBytes |
| Total received bytes. More... | |
| uint32_t | m_nTotalReceivedPackets |
| Total received packets. More... | |
| TracedCallback< Ptr< const Packet > > | m_traceDequeue |
| Traced callback: fired when a packet is dequeued. More... | |
| TracedCallback< Ptr< const Packet > > | m_traceDrop |
| Traced callback: fired when a packet is dropped. More... | |
| TracedCallback< Ptr< const Packet > > | m_traceEnqueue |
| Traced callback: fired when a packet is enqueued. More... | |
| Related Functions inherited from ns3::ObjectBase | |
| static TypeId | GetObjectIid (void) |
| Ensure the TypeId for ObjectBase gets fully configured to anchor the inheritance tree properly. More... | |
A RED packet queue.
ns3::RedQueue is accessible through the following paths with Config::Set and Config::Connect:
No TraceSources are defined for this type.
Size of this type is 336 bytes (on a 64-bit architecture).
Definition at line 82 of file red-queue.h.
| ns3::RedQueue::RedQueue | ( | ) |
RedQueue Constructor.
Create a RED queue
Definition at line 151 of file red-queue.cc.
References m_uv, and NS_LOG_FUNCTION.
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virtual |
| int64_t ns3::RedQueue::AssignStreams | ( | int64_t | stream | ) |
Assign a fixed random variable stream number to the random variables used by this model.
Return the number of streams (possibly zero) that have been assigned.
| stream | first stream index to use |
Definition at line 204 of file red-queue.cc.
References m_uv, NS_LOG_FUNCTION, and ns3::RandomVariableStream::SetStream().
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Returns a probability using these function parameters for the DropEarly function.
| qAvg | Average queue length |
| maxTh | Max avg length threshold |
| gentle | "gentle" algorithm |
| vA | vA |
| vB | vB |
| vC | vC |
| vD | vD |
| maxP | max_p |
Definition at line 502 of file red-queue.cc.
References NS_LOG_FUNCTION.
Referenced by DropEarly().
Here is the caller graph for this function:Pull a packet from the queue.
Implements ns3::Queue.
Definition at line 613 of file red-queue.cc.
References ns3::Packet::GetSize(), m_bytesInQueue, m_idle, m_idleTime, m_packets, ns3::Simulator::Now(), NS_LOG_FUNCTION, and NS_LOG_LOGIC.
Here is the call graph for this function:Push a packet in the queue.
| p | the packet to enqueue |
Implements ns3::Queue.
Definition at line 212 of file red-queue.cc.
References ns3::Queue::Drop(), DropEarly(), DTYPE_FORCED, DTYPE_NONE, DTYPE_UNFORCED, Estimator(), ns3::RedQueue::Stats::forcedDrop, GetMode(), ns3::Packet::GetSize(), InitializeParams(), m_bytesInQueue, m_cautious, m_count, m_countBytes, m_hasRedStarted, m_idle, m_idlePktSize, m_idleTime, m_isGentle, m_isNs1Compat, m_maxTh, m_meanPktSize, m_minTh, m_old, m_packets, m_ptc, m_qAvg, m_queueLimit, m_qW, m_stats, m_vProb, ns3::Simulator::Now(), NS_LOG_DEBUG, NS_LOG_FUNCTION, NS_LOG_INFO, NS_LOG_LOGIC, ns3::RedQueue::Stats::qLimDrop, ns3::Queue::QUEUE_MODE_BYTES, ns3::Queue::QUEUE_MODE_PACKETS, and ns3::RedQueue::Stats::unforcedDrop.
Here is the call graph for this function:Peek the front packet in the queue.
Implements ns3::Queue.
Definition at line 642 of file red-queue.cc.
References m_bytesInQueue, m_packets, NS_LOG_FUNCTION, and NS_LOG_LOGIC.
Check if packet p needs to be dropped due to probability mark.
| p | packet |
| qSize | queue size |
Definition at line 441 of file red-queue.cc.
References CalculatePNew(), ns3::Packet::GetSize(), ns3::UniformRandomVariable::GetValue(), m_cautious, m_count, m_countBytes, m_curMaxP, m_isGentle, m_isWait, m_maxTh, m_meanPktSize, m_ptc, m_qAvg, m_qW, m_uv, m_vA, m_vB, m_vC, m_vD, m_vProb, m_vProb1, ModifyP(), NS_LOG_FUNCTION, and NS_LOG_LOGIC.
Referenced by DoEnqueue().
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Compute the average queue size.
| nQueued | number of queued packets |
| m | simulated number of packets arrival during idle period |
| qAvg | average queue size |
| qW | queue weight given to cur q size sample |
Definition at line 421 of file red-queue.cc.
References NS_LOG_FUNCTION.
Referenced by DoEnqueue().
Here is the caller graph for this function:| RedQueue::QueueMode ns3::RedQueue::GetMode | ( | void | ) |
Get the encapsulation mode of this queue.
Get the encapsulation mode of this queue
Definition at line 174 of file red-queue.cc.
References m_mode, and NS_LOG_FUNCTION.
Referenced by DoEnqueue(), GetQueueSize(), ModifyP(), and RedQueueTestCase::RunRedTest().
Here is the caller graph for this function:| uint32_t ns3::RedQueue::GetQueueSize | ( | void | ) |
Get the current value of the queue in bytes or packets.
Definition at line 595 of file red-queue.cc.
References GetMode(), m_bytesInQueue, m_packets, NS_ABORT_MSG, NS_LOG_FUNCTION, ns3::Queue::QUEUE_MODE_BYTES, and ns3::Queue::QUEUE_MODE_PACKETS.
Referenced by RedQueueTestCase::RunRedTest().
Here is the call graph for this function: Here is the caller graph for this function:| RedQueue::Stats ns3::RedQueue::GetStats | ( | ) |
Get the RED statistics after running.
Definition at line 197 of file red-queue.cc.
References m_stats, and NS_LOG_FUNCTION.
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Get the type ID.
Definition at line 74 of file red-queue.cc.
References m_idlePktSize, m_isGentle, m_isNs1Compat, m_isWait, m_linkBandwidth, m_linkDelay, m_lInterm, m_maxTh, m_meanPktSize, m_minTh, m_queueLimit, m_qW, ns3::MakeBooleanAccessor(), ns3::MakeBooleanChecker(), ns3::MakeDataRateAccessor(), ns3::MakeDataRateChecker(), ns3::MakeDoubleAccessor(), ns3::MakeEnumAccessor(), ns3::MakeEnumChecker(), ns3::MakeTimeAccessor(), ns3::MakeTimeChecker(), ns3::MakeUintegerAccessor(), ns3::MilliSeconds(), ns3::Queue::QUEUE_MODE_BYTES, ns3::Queue::QUEUE_MODE_PACKETS, SetMode(), and ns3::TypeId::SetParent().
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Initialize the queue parameters.
Note: if the link bandwidth changes in the course of the simulation, the bandwidth-dependent RED parameters do not change. This should be fixed, but it would require some extra parameters, and didn't seem worth the trouble...
Definition at line 342 of file red-queue.cc.
References ns3::RedQueue::Stats::forcedDrop, ns3::DataRate::GetBitRate(), ns3::Time::GetSeconds(), m_cautious, m_count, m_countBytes, m_curMaxP, m_idle, m_idleTime, m_isGentle, m_isWait, m_linkBandwidth, m_linkDelay, m_lInterm, m_maxTh, m_meanPktSize, m_minTh, m_old, m_ptc, m_qAvg, m_qW, m_stats, m_vA, m_vB, m_vC, m_vD, ns3::NanoSeconds(), NS_ASSERT, NS_LOG_DEBUG, NS_LOG_FUNCTION, ns3::RedQueue::Stats::qLimDrop, and ns3::RedQueue::Stats::unforcedDrop.
Referenced by DoEnqueue().
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Returns a probability using these function parameters for the DropEarly function.
| p | Prob. of packet drop before "count" |
| count | number of packets since last random number generation |
| countBytes | number of bytes since last drop |
| meanPktSize | Avg pkt size |
| wait | True for waiting between dropped packets |
| size | packet size |
Definition at line 543 of file red-queue.cc.
References GetMode(), NS_LOG_FUNCTION, and ns3::Queue::QUEUE_MODE_BYTES.
Referenced by DropEarly().
Here is the call graph for this function: Here is the caller graph for this function:| void ns3::RedQueue::SetMode | ( | RedQueue::QueueMode | mode | ) |
Set the operating mode of this queue.
Set operating mode
| mode | The operating mode of this queue. |
Definition at line 167 of file red-queue.cc.
References m_mode, and NS_LOG_FUNCTION.
Referenced by GetTypeId().
Here is the caller graph for this function:| void ns3::RedQueue::SetQueueLimit | ( | uint32_t | lim | ) |
Set the limit of the queue.
| lim | The limit in bytes or packets. |
Definition at line 181 of file red-queue.cc.
References m_queueLimit, and NS_LOG_FUNCTION.
Referenced by RedQueueTestCase::RunRedTest().
Here is the caller graph for this function:| void ns3::RedQueue::SetTh | ( | double | minTh, |
| double | maxTh | ||
| ) |
Set the thresh limits of RED.
| minTh | Minimum thresh in bytes or packets. |
| maxTh | Maximum thresh in bytes or packets. |
Definition at line 188 of file red-queue.cc.
References m_maxTh, m_minTh, NS_ASSERT, and NS_LOG_FUNCTION.
Referenced by RedQueueTestCase::RunRedTest().
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bytes in the queue
Definition at line 238 of file red-queue.h.
Referenced by DoDequeue(), DoEnqueue(), DoPeek(), and GetQueueSize().
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0 for default RED 1 experimental (see red-queue.cc) 2 experimental (see red-queue.cc) 3 use Idle packet size in the ptc
Definition at line 277 of file red-queue.h.
Referenced by DoEnqueue(), DropEarly(), and InitializeParams().
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Number of packets since last random number generation.
Definition at line 270 of file red-queue.h.
Referenced by DoEnqueue(), DropEarly(), and InitializeParams().
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Number of bytes since last drop.
Definition at line 265 of file red-queue.h.
Referenced by DoEnqueue(), DropEarly(), and InitializeParams().
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Current max_p.
Definition at line 263 of file red-queue.h.
Referenced by DropEarly(), and InitializeParams().
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0/1 idle status
Definition at line 267 of file red-queue.h.
Referenced by DoDequeue(), DoEnqueue(), and InitializeParams().
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Avg pkt size used during idle times.
Definition at line 245 of file red-queue.h.
Referenced by DoEnqueue(), and GetTypeId().
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Start of current idle period.
Definition at line 278 of file red-queue.h.
Referenced by DoDequeue(), DoEnqueue(), and InitializeParams().
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True to increases dropping prob.
slowly when ave queue exceeds maxthresh
Definition at line 247 of file red-queue.h.
Referenced by DoEnqueue(), DropEarly(), GetTypeId(), and InitializeParams().
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Ns-1 compatibility.
Definition at line 253 of file red-queue.h.
Referenced by DoEnqueue(), and GetTypeId().
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True for waiting between dropped packets.
Definition at line 246 of file red-queue.h.
Referenced by DropEarly(), GetTypeId(), and InitializeParams().
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Link bandwidth.
Definition at line 254 of file red-queue.h.
Referenced by GetTypeId(), and InitializeParams().
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Link delay.
Definition at line 255 of file red-queue.h.
Referenced by GetTypeId(), and InitializeParams().
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The max probability of dropping a packet.
Definition at line 252 of file red-queue.h.
Referenced by GetTypeId(), and InitializeParams().
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Max avg length threshold (bytes), should be >= 2*minTh.
Definition at line 249 of file red-queue.h.
Referenced by DoEnqueue(), DropEarly(), GetTypeId(), InitializeParams(), and SetTh().
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Avg pkt size.
Definition at line 244 of file red-queue.h.
Referenced by DoEnqueue(), DropEarly(), GetTypeId(), and InitializeParams().
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Min avg length threshold (bytes)
Definition at line 248 of file red-queue.h.
Referenced by DoEnqueue(), GetTypeId(), InitializeParams(), and SetTh().
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Mode (Bytes or packets)
Definition at line 243 of file red-queue.h.
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0 when average queue first exceeds threshold
Definition at line 266 of file red-queue.h.
Referenced by DoEnqueue(), and InitializeParams().
packets in the queue
Definition at line 236 of file red-queue.h.
Referenced by DoDequeue(), DoEnqueue(), DoPeek(), and GetQueueSize().
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packet time constant in packets/second
Definition at line 268 of file red-queue.h.
Referenced by DoEnqueue(), DropEarly(), and InitializeParams().
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Average queue length.
Definition at line 269 of file red-queue.h.
Referenced by DoEnqueue(), DropEarly(), and InitializeParams().
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Queue limit in bytes / packets.
Definition at line 250 of file red-queue.h.
Referenced by DoEnqueue(), GetTypeId(), and SetQueueLimit().
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Queue weight given to cur queue size sample.
Definition at line 251 of file red-queue.h.
Referenced by DoEnqueue(), DropEarly(), GetTypeId(), and InitializeParams().
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RED statistics.
Definition at line 240 of file red-queue.h.
Referenced by DoEnqueue(), GetStats(), and InitializeParams().
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rng stream
Definition at line 280 of file red-queue.h.
Referenced by AssignStreams(), DropEarly(), and RedQueue().
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1.0 / (m_maxTh - m_minTh)
Definition at line 259 of file red-queue.h.
Referenced by DropEarly(), and InitializeParams().
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-m_minTh / (m_maxTh - m_minTh)
Definition at line 260 of file red-queue.h.
Referenced by DropEarly(), and InitializeParams().
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(1.0 - m_curMaxP) / m_maxTh - used in "gentle" mode
Definition at line 261 of file red-queue.h.
Referenced by DropEarly(), and InitializeParams().
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2.0 * m_curMaxP - 1.0 - used in "gentle" mode
Definition at line 262 of file red-queue.h.
Referenced by DropEarly(), and InitializeParams().
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Prob.
of packet drop
Definition at line 264 of file red-queue.h.
Referenced by DoEnqueue(), and DropEarly().
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Prob.
of packet drop before "count"
Definition at line 258 of file red-queue.h.
Referenced by DropEarly().
1.8.9.1 
