TTCP Testing

Two PEs connected via 1Gbps fibre;

pe1.sx#ttcp
transmit or receive [receive]: transmit
Target IP address: 10.200.20.5
perform tcp half close [n]: 
send buflen [8192]: 
send nbuf [2048]: 
bufalign [16384]: 
bufoffset [0]: 
port [5001]: 
sinkmode [y]: 
buffering on writes [y]: 
show tcp information at end [n]: y

ttcp-t: buflen=8192, nbuf=2048, align=16384/0, port=5001  tcp  -> 10.200.20.5
ttcp-t: connect
ttcp-t: 16777216 bytes in 7328 ms (7.328 real seconds) (~2235 kB/s) +++
ttcp-t: 2048 I/O calls
ttcp-t: 0 sleeps (0 ms total) (0 ms average)
Connection state is ESTAB, I/O status: 1, unread input bytes: 0            
Connection is ECN Disabled, Mininum incoming TTL 0, Outgoing TTL 255
Local host: 10.200.20.6, Local port: 22382
Foreign host: 10.200.20.5, Foreign port: 5001
Connection tableid (VRF): 0
Maximum output segment queue size: 50

Enqueued packets for retransmit: 45, input: 0  mis-ordered: 0 (0 bytes)

Event Timers (current time is 0x1DD19771C):
Timer          Starts    Wakeups            Next
Retrans          7163          0     0x1DD197AEF
TimeWait            0          0             0x0
AckHold             1          0             0x0
SendWnd             0          0             0x0
KeepAlive           0          0             0x0
GiveUp              0          0             0x0
PmtuAger            0          0             0x0
DeadWait            0          0             0x0
Linger              0          0             0x0
ProcessQ            0          0             0x0

iss: 1960139973  snduna: 1976855962  sndnxt: 1976917190
irs: 3747162406  rcvnxt: 3747162407

sndwnd:  65535  scale:      0  maxrcvwnd:  65535
rcvwnd:  65535  scale:      0  delrcvwnd:      0

SRTT: 1000 ms, RTTO: 1003 ms, RTV: 3 ms, KRTT: 0 ms
minRTT: 0 ms, maxRTT: 1000 ms, ACK hold: 200 ms
Status Flags: active open
Option Flags: Retrans timeout
IP Precedence value : 0

Datagrams (max data segment is 1436 bytes):
Rcvd: 15281 (out of order: 0), with data: 0, total data bytes: 0
Sent: 12290 (retransmit: 0, fastretransmit: 0, partialack: 0, Second Congestion: 0), with data: 12288, total data bytes: 16777216

 Packets received in fast path: 0, fast processed: 0, slow path: 0
 fast lock acquisition failures: 0, slow path: 0
TCP Semaphore      0x0A05F4D8  FREE 
pe1.ph#ttcp
transmit or receive [receive]: 
perform tcp half close [n]: 
use tcp driver [n]: 
receive buflen [8192]: 
bufalign [16384]: 
bufoffset [0]: 
port [5001]: 
sinkmode [y]: 
rcvwndsize [65535]: 
delayed ACK [y]: 
show tcp information at end [n]: y

ttcp-r: buflen=8192, align=16384/0, port=5001
rcvwndsize=65535, delayedack=yes  tcp
ttcp-r: accept from 10.200.20.6
ttcp-r: 16777216 bytes in 7356 ms (7.356 real seconds) (~2226 kB/s)+++
ttcp-r: 2671 I/O calls
ttcp-r: 0 sleeps (0 ms total) (0 ms average)
Connection state is CLOSEWAIT, I/O status: 1, unread input bytes: 0            
Connection is ECN Disabled, Mininum incoming TTL 0, Outgoing TTL 255
Local host: 10.200.20.5, Local port: 5001
Foreign host: 10.200.20.6, Foreign port: 22382
Connection tableid (VRF): 0
Maximum output segment queue size: 20

Enqueued packets for retransmit: 0, input: 0  mis-ordered: 0 (0 bytes)

Event Timers (current time is 0x1FE9B62F8):
Timer          Starts    Wakeups            Next
Retrans             1          0             0x0
TimeWait            0          0             0x0
AckHold          7190          0             0x0
SendWnd             0          0             0x0
KeepAlive       12290          0             0x0
GiveUp              0          0             0x0
PmtuAger            0          0             0x0
DeadWait            0          0             0x0
Linger              0          0             0x0
ProcessQ            0          0             0x0

iss: 3747162406  snduna: 3747162407  sndnxt: 3747162407
irs: 1960139973  rcvnxt: 1976917191

sndwnd:  65535  scale:      0  maxrcvwnd:  65535
rcvwnd:  63087  scale:      0  delrcvwnd:   2448

SRTT: 125 ms, RTTO: 2625 ms, RTV: 2500 ms, KRTT: 0 ms
minRTT: 0 ms, maxRTT: 1000 ms, ACK hold: 200 ms
Status Flags: passive open, gen tcbs
Option Flags: Retrans timeout
IP Precedence value : 0

Datagrams (max data segment is 1436 bytes):
Rcvd: 12291 (out of order: 0), with data: 12288, total data bytes: 16777216
Sent: 15334 (retransmit: 0, fastretransmit: 0, partialack: 0, Second Congestion: 0), with data: 0, total data bytes: 0

 Packets received in fast path: 0, fast processed: 0, slow path: 0
 fast lock acquisition failures: 0, slow path: 0
TCP Semaphore      0x125EB7CC  FREE