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Full Discussion: AIX 6.1 reach the threshold of stream(no -a|grep strthresh)
Operating Systems AIX AIX 6.1 reach the threshold of stream(no -a|grep strthresh) Post 302770877 by machinen on Monday 18th of February 2013 08:29:48 PM
Old 02-18-2013
1、netstat -m output of failed is consistently zero.
2、mtu
Code:
for i in 1 2 
do
lsattr -El en$i|grep mtu
done

both of en1 and en2's mtu are 1500
the application run this machine is oracle 11gR2 rac,and the client is middleware tuxedo
3、first output
Code:
# netstat -tn | head -2;netstat -tn | grep ESTABLISHED | head
Active Internet connections
Proto Recv-Q Send-Q  Local Address          Foreign Address        (state)
tcp4       0      0  172.18.100.9.1521      172.18.100.5.52799     ESTABLISHED
tcp4       0      0  172.18.100.9.1521      172.18.100.5.52905     ESTABLISHED
tcp4       0      0  172.18.100.9.1521      172.18.100.5.53378     ESTABLISHED
tcp4       0      0  172.18.100.9.1521      172.18.100.5.55738     ESTABLISHED
tcp4       0      0  127.0.0.1.6100         127.0.0.1.65429        ESTABLISHED
tcp4       0      0  127.0.0.1.65429        127.0.0.1.6100         ESTABLISHED
tcp4       0      0  172.18.100.9.1521      172.18.100.5.56564     ESTABLISHED
tcp4       0      0  172.18.100.9.1521      172.18.100.5.32805     ESTABLISHED
tcp4       0      0  172.18.100.9.1521      172.18.100.5.32806     ESTABLISHED
tcp4       0      0  172.18.100.9.1521      172.18.100.5.32807     ESTABLISHED

4、second output
Code:
 # netstat -tn | head -2; netstat -tn | grep ESTABLISHED | head
Active Internet connections
Proto Recv-Q Send-Q  Local Address          Foreign Address        (state)
tcp4       0      0  172.18.100.9.1521      172.18.100.5.52799     ESTABLISHED
tcp4       0      0  172.18.100.9.1521      172.18.100.5.52905     ESTABLISHED
tcp4       0      0  172.18.100.9.1521      172.18.100.5.53378     ESTABLISHED
tcp4       0      0  172.18.100.9.1521      172.18.100.5.55738     ESTABLISHED
tcp4       0      0  127.0.0.1.6100         127.0.0.1.65429        ESTABLISHED
tcp4       0      0  127.0.0.1.65429        127.0.0.1.6100         ESTABLISHED
tcp4       0      0  172.18.100.9.1521      172.18.100.5.56564     ESTABLISHED
tcp4       0      0  172.18.100.9.1521      172.18.100.5.32805     ESTABLISHED
tcp4       0      0  172.18.100.9.1521      172.18.100.5.32806     ESTABLISHED
tcp4       0      0  172.18.100.9.1521      172.18.100.5.32807     ESTABLISHED

5、netstat -p tcp output
Code:
tcp:
       447631444 packets sent
               425423593 data packets (2452701253 bytes)
               2796 data packets (2109430 bytes) retransmitted
               2332528 ack-only packets (1814129 delayed)
               0 URG only packets
               3 window probe packets
               19339756 window update packets
               1065558 control packets
               20593693 large sends
               2004898651 bytes sent using largesend
               4170240 bytes is the biggest largesend
       422219647 packets received
               341923413 acks (for 2452662545 bytes)
               216669 duplicate acks
               0 acks for unsent data
               315335086 packets (1007197678 bytes) received in-sequence
               7624 completely duplicate packets (60958 bytes)
               488 old duplicate packets
               0 packets with some dup. data (0 bytes duped)
               138640 out-of-order packets (42518 bytes)
               0 packets (0 bytes) of data after window
               0 window probes
              524552 window update packets
               2407 packets received after close
               0 packets with bad hardware assisted checksum
               0 discarded for bad checksums
               0 discarded for bad header offset fields
               0 discarded because packet too short
               1489 discarded by listeners
               0 discarded due to listener's queue full
               90949323 ack packet headers correctly predicted
               79016426 data packet headers correctly predicted
       267916 connection requests
       110757 connection accepts
       258066 connections established (including accepts)
       391662 connections closed (including 613 drops)
       0 connections with ECN capability
       0 times responded to ECN
       118143 embryonic connections dropped
       320167932 segments updated rtt (of 265052429 attempts)
       0 segments with congestion window reduced bit set
       0 segments with congestion experienced bit set
       0 resends due to path MTU discovery
       2563 path MTU discovery terminations due to retransmits
       9875 retransmit timeouts
               0 connections dropped by rexmit timeout
       55 fast retransmits
               4 when congestion window less than 4 segments
       48 newreno retransmits
       0 times avoided false fast retransmits
       2 persist timeouts
               0 connections dropped due to persist timeout
       7550 keepalive timeouts
               0 keepalive probes sent
               1 connection dropped by keepalive
       0 times SACK blocks array is extended
       0 times SACK holes array is extended
       0 packets dropped due to memory allocation failure
       0 connections in timewait reused
       0 delayed ACKs for SYN
       0 delayed ACKs for FIN
       0 send_and_disconnects
       0 spliced connections
       0 spliced connections closed
       0 spliced connections reset
       0 spliced connections timeout
       0 spliced connections persist timeout
       0 spliced connections keepalive timeout
       7 TCP checksum offload disabled during retransmit
       27 Connections dropped due to bad ACKs
       0 Connections dropped due to duplicate SYN packets
       0 fastpath loopback connections
       0 fastpath loopback sent packets (0 bytes)
       0 fastpath loopback received packets (0 bytes)

6、this qustion has appeared 2 times，first time i changed the strthresh from 85 to 92 ,the second from 90 to 92,a few days ago the ibm engineer told me can modify the strthresh to 0 and the stream has no limit,i dont't modify that because i am worry about if i change to 0 when the stream usage reach 100% and whole system is hang until i reboot the system from hmc or something.
7、the system has reboot a week ago and the switch hang has found before that,so the netstat's statistics was lost


thanks a lot for your helping.
Last edited by zaxxon; 02-19-2013 at 06:07 AM.. Reason: uncomplete usage of code tags
 

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