A fix is available
APAR status
Closed as program error.
Error description
The first retransmit packet may be sent after 64 seconds, so the application will suffer from the slow TCP data transfer. At that time, the routing entry will show very high rtt/rttvar value: . # route get <ip> ...... recvpipe sendpipe ssthresh rtt,msec rttvar ... 0 0 0 61847 1058704 ...
Local fix
N/A
Problem summary
**************************************************************** * USERS AFFECTED: * Users of TCP/IP on systems running the 6100-07 Technology * Level. **************************************************************** * PROBLEM DESCRIPTION: * TCP/IP communication can be very slow due to retransmit * processing. The first retransmit packet may be sent after * 64 seconds. During this time the routing entry will show * very high rtt/rttvar values. * * Possible workaround is: * Turn off the rfc1323 using the chdev command or the * ifconfig command. Example of chdev command is * * chdev -l enX -a rfc1323=0 * * This problem only occurs when the timestamp is used * for RTT calculation. Note that you can use the ifconfig * command to temporarily disable rfc1323 for testing purposes. * The chdev command alters the ODM so customer values * return after a system reboot. **************************************************************** * RECOMMENDATION: * Install APAR IV14297. * * Prior to APAR availability, and interim fix is available from: * ftp://public.dhe.ibm.com/aix/ifixes/iv14297/ **************************************************************** .
Problem conclusion
When customer disables tcp timestamp randomization feature, Randomized timestamp value is not used for setting the retransmission timer. This fixes the above mentioned issue.
Temporary fix
********* * HIPER * *********
Comments
APAR Information
APAR number
IV14297
Reported component name
AIX 610 STD EDI
Reported component ID
5765G6200
Reported release
610
Status
CLOSED PER
PE
YesPE
HIPER
YesHIPER
Submitted date
2012-01-28
Closed date
2012-01-31
Last modified date
2013-02-26
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
AIX 610 STD EDI
Fixed component ID
5765G6200
Applicable component levels
R610 PSY U841068
UP12/05/14 I 1000
PTF to Fileset Mapping
U841068 bos.net.tcp.client 6.1.7.15
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Document Information
Modified date:
26 February 2013