11-12-2008
Any idea what this counter means "tcpTimRetrans"
I am chasing an issue where I see drop packets, in order to dig the problem further I issue netstat -s -P tcp command which shows me the stats from the tcp perspective. In that stats I see a counter which is "tcpTimRetrans" which increments along with "tcpRetransSegs".
When both of these counter increments the same time that's when my application complains that a drop packet occurs. Question is does any one knows
- What is "tcpTimRetrans" counter is?
- Any idea to what cause the "tcpRetransSegs" and "tcpTimRetrans" increments the same time?
Any help in this regards will be much appreciated.
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LEARN ABOUT CENTOS
tapset::tcp
tapset::tcp(3stap) tapset::tcp(3stap)
NAME
tapset::tcp - systemtap tcp tapset
DESCRIPTION
This family of probe points is used to probe events that occur in the TCP layer,
tcp.sendmsg
Sending a tcp message
See probe::tcp.sendmsg(3stap)
for details.
tcp.sendmsg.return
Sending TCP message is done
See probe::tcp.sendmsg.return(3stap)
for details.
tcp.recvmsg
Receiving TCP message
See probe::tcp.recvmsg(3stap)
for details.
tcp.recvmsg.return
Receiving TCP message complete
See probe::tcp.recvmsg.return(3stap)
for details.
tcp.disconnect
TCP socket disconnection
See probe::tcp.disconnect(3stap)
for details.
tcp.disconnect.return
TCP socket disconnection complete
See probe::tcp.disconnect.return(3stap)
for details.
tcp.setsockopt
Call to setsockopt()
See probe::tcp.setsockopt(3stap)
for details.
tcp.setsockopt.return
Return from setsockopt()
See probe::tcp.setsockopt.return(3stap)
for details.
tcp.receive
Called when a TCP packet is received
See probe::tcp.receive(3stap)
for details.
SEE ALSO
probe::tcp.sendmsg(3stap), probe::tcp.sendmsg.return(3stap), probe::tcp.recvmsg(3stap), probe::tcp.recvmsg.return(3stap),
probe::tcp.disconnect(3stap), probe::tcp.disconnect.return(3stap), probe::tcp.setsockopt(3stap), probe::tcp.setsockopt.return(3stap),
probe::tcp.receive(3stap), stap(1), stapprobes(3stap)
IBM
--- tapset::tcp(3stap)