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Decrease latency of RX seqbuf

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This commit is contained in:
Nonoo 2020-11-21 11:01:37 +01:00
parent 44f5b15994
commit bed7d95f7c
5 changed files with 220 additions and 116 deletions
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47
streamcommon.go
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@ -24,8 +24,6 @@ type streamCommon struct {
pkt0 pkt0Type
pkt7 pkt7Type
lastSeqBufFrontRxSeq uint16
}
func (s *streamCommon) send(d []byte) error {
@ -154,8 +152,6 @@ func (s *streamCommon) sendRetransmitRequest(seqNum uint16) error {
return nil
}
type seqNumRange [2]uint16
func (s *streamCommon) sendRetransmitRequestForRanges(seqNumRanges []seqNumRange) error {
seqNumBytes := make([]byte, len(seqNumRanges)*4)
for i := 0; i < len(seqNumRanges); i++ {
@ -177,35 +173,26 @@ func (s *streamCommon) sendRetransmitRequestForRanges(seqNumRanges []seqNumRange
return nil
}
func (s *streamCommon) requestRetransmitIfNeeded(gotSeq uint16) error {
prevExpectedSeq := gotSeq - 1
if s.lastSeqBufFrontRxSeq != prevExpectedSeq {
var missingPkts int
var sr seqNumRange
if prevExpectedSeq > s.lastSeqBufFrontRxSeq {
sr[0] = s.lastSeqBufFrontRxSeq
sr[1] = prevExpectedSeq
missingPkts = int(prevExpectedSeq) - int(s.lastSeqBufFrontRxSeq)
} else {
sr[0] = prevExpectedSeq
sr[1] = s.lastSeqBufFrontRxSeq
missingPkts = int(prevExpectedSeq) + 65536 - int(s.lastSeqBufFrontRxSeq)
func (s *streamCommon) requestRetransmit(r seqNumRange) error {
diff := r.getDiff(0xffff)
if diff > maxRetransmitRequestPacketCount {
return errors.New("retransmit range too large")
}
if diff == 0 {
log.Debug(s.name+"/requesting pkt #", r[0], " retransmit")
netstat.reportRetransmit(diff)
if err := s.sendRetransmitRequest(uint16(r[0])); err != nil {
return err
}
if missingPkts == 1 {
log.Debug(s.name+"/requesting pkt #", sr[1], " retransmit")
netstat.reportRetransmit(missingPkts)
if err := s.sendRetransmitRequest(sr[1]); err != nil {
return err
}
} else if missingPkts <= maxRetransmitRequestPacketCount {
log.Debug(s.name+"/requesting pkt #", sr[0], "-#", sr[1], " retransmit")
netstat.reportRetransmit(missingPkts)
if err := s.sendRetransmitRequestForRanges([]seqNumRange{sr}); err != nil {
return err
}
} else {
log.Debug(s.name+"/requesting pkt #", r[0], "-#", r[1], " retransmit")
netstat.reportRetransmit(diff)
if err := s.sendRetransmitRequestForRanges([]seqNumRange{r}); err != nil {
return err
}
}
s.lastSeqBufFrontRxSeq = gotSeq
return nil
}