Recently I have been facing troubleshoot with my TCP speed. I have Roger's router.My speed was D: 21mb/s and U: 0.5mb/s, recently the speed decreased to 2 & 0.3mb/s respectively. My statistics that I have got from MLab are
Your system: Windows 7 version 6.1
Java version: 1.6.0_20 (x86)
TCP receive window: 1240832 current, 1575424 maximum
6.98812E-4 packets lost during test
Round trip time: 120 msec (minimum), 575 msec (maximum), 305.31 msec (average)
Jitter: 455 msec
0 seconds spend waiting following a timeout
TCP time-out counter: 608
108 selective acknowledgement packets received
No duplex mismatch condition was detected.
The test did not detect a cable fault.
Network congestion may be limiting the connection.
No network addess translation appliance was detected.
0.9388% of the time was not spent in a receiver limited or sender limited state.
84.46000000000001% of the time the connection is limited by the client machine's receive buffer.
Optimal receive buffer: 1613234176 bytes
Bottleneck link: Cable/DSL modem
0 duplicate ACKs set
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WEB100 Kernel Variables:
Client: localhost/127.0.0.1
CurMSS: 1382
X_Rcvbuf: 87380
X_Sndbuf: 258912
SumRTT: 152960
Timeouts: 0
TimestampsEnabled: 0
WinScaleRcvd: 8
WinScaleSent: 7
DupAcksOut: 0
StartTimeUsec: 878458
Duration: 10195052
c2sData: 2
c2sAck: 2
s2cData: 8
s2cAck: 3
half_duplex: 0
link: 0
congestion: 1
bad_cable: 0
mismatch: 0
minCWNDpeak: 11056
maxCWNDpeak: 136818
CWNDpeaks: 1
The theoretical network limit is 1.31 Mbps
The NDT server has a 126.0 KByte buffer which limits the throughput to 6.46 Mbps
Your PC/Workstation has a 1538.0 KByte buffer which limits the throughput to 39.36 Mbps
The network based flow control limits the throughput to 3.41 Mbps
Client Data reports link is 'T1', Client Acks report link is 'T1'
Server Data reports link is 'OC-48', Server Acks report link is 'Ethernet'
What should I do? Please give your advices.
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