A fix is available
APAR status
Closed as program error.
Error description
A tcp connection can hang and never send the last bytes
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: * Systems running the 6100-06 Technology Level with * bos.net.tcp.client below the 6.1.6.22 level. **************************************************************** * PROBLEM DESCRIPTION: * An established tcp connection can hang and never send the last * bytes. This has been seen primarily on VIO Clients, when * transferring large amounts of data. * * It happens when the send for the previous packet is * ACKed all at once before the call to ip_output returns back to * tcp_output. * * To determine if you're experiencing this problem, run * 'netstat -an' in a 5 sec loop. * If you notice the Send-Q value has the same non-zero value for * the same established connection after a couple of iterations, * you may be experiencing this problem. **************************************************************** * RECOMMENDATION: * Install APAR IV33483. * Prior to fix availability, an interim fix is available from * ftp://public.dhe.ibm.com/aix/ifixes/iv33483/ ****************************************************************
Problem conclusion
TCP code is modified to record all acknowledgement recepits and make sure those last bytes were also sent. This change solves tcp hang issue
Temporary fix
********* * HIPER * *********
Comments
APAR Information
APAR number
IV33483
Reported component name
AIX 610 STD EDI
Reported component ID
5765G6200
Reported release
610
Status
CLOSED PER
PE
YesPE
HIPER
YesHIPER
Submitted date
2012-12-14
Closed date
2012-12-14
Last modified date
2013-11-23
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
U858649
Fix information
Fixed component name
AIX 610 STD EDI
Fixed component ID
5765G6200
Applicable component levels
R610 PSY U858649
UP13/03/28 I 1000 ®
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Document Information
Modified date:
17 December 2021