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Tweak new RX queue algorithm to "expire" old entries to prevent always needing to traverse the whole queue array.

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This commit is contained in:
Adam Ierymenko 2016-04-06 16:28:40 -07:00
parent 8ef78e7e7d
commit 56096be8b6
3 changed files with 10 additions and 3 deletions
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5
node/Constants.hpp
View File

@ -169,6 +169,11 @@
*/
#define ZT_RX_QUEUE_SIZE 64
/**
* RX queue entries older than this do not "exist"
*/
#define ZT_RX_QUEUE_EXPIRE 4000
/**
* Length of secret key in bytes -- 256-bit -- do not change
*/

4
node/Switch.cpp
View File

@ -138,7 +138,7 @@ void Switch::onRemotePacket(const InetAddress &localAddr,const InetAddress &from
// seeing a Packet::Fragment?
Mutex::Lock _l(_rxQueue_m);
RXQueueEntry *const rq = _findRXQueueEntry(fragmentPacketId);
RXQueueEntry *const rq = _findRXQueueEntry(now,fragmentPacketId);
if ((!rq->timestamp)||(rq->packetId != fragmentPacketId)) {
// No packet found, so we received a fragment without its head.
@ -241,7 +241,7 @@ void Switch::onRemotePacket(const InetAddress &localAddr,const InetAddress &from
// Packet is the head of a fragmented packet series
Mutex::Lock _l(_rxQueue_m);
RXQueueEntry *const rq = _findRXQueueEntry(packetId);
RXQueueEntry *const rq = _findRXQueueEntry(now,packetId);
if ((!rq->timestamp)||(rq->packetId != packetId)) {
// If we have no other fragments yet, create an entry and save the head

4
node/Switch.hpp
View File

@ -184,7 +184,7 @@ private:
/* Returns the matching or oldest entry. Caller must check timestamp and
* packet ID to determine which. */
inline RXQueueEntry *_findRXQueueEntry(uint64_t packetId)
inline RXQueueEntry *_findRXQueueEntry(uint64_t now,uint64_t packetId)
{
RXQueueEntry *rq;
RXQueueEntry *oldest = &(_rxQueue[ZT_RX_QUEUE_SIZE - 1]);
@ -193,6 +193,8 @@ private:
rq = &(_rxQueue[--i]);
if ((rq->packetId == packetId)&&(rq->timestamp))
return rq;
if ((now - rq->timestamp) >= ZT_RX_QUEUE_EXPIRE)
rq->timestamp = 0;
if (rq->timestamp < oldest->timestamp)
oldest = rq;
}