A fix is available
APAR status
Closed as program error.
Error description
The TCP parameters "nbc_limit" and "nbc_pseg_limit" do not properly recalculate after a DLPAR or firmware assisted dump operation completes.
Local fix
Using the "no" command line program, set these tunables manually after a DLPAR or firmware assisted dump operation.
Problem summary
DLPAR memory add or remove will change thewall accordingly, however nbc_limit and nbc_pseg_limit values are not adjusted.
Problem conclusion
In case of DLPAR memory add it is not harmful if nbc_limit and nbc_pseg_limit_init are not adjusted accordingly as this will not cause these values to go beyond their allowed limits. However one or more DLPAR memory remove operation can cause nbc_limit and nbc_limit_init to exceed their allowed limits and cause network memory hog if network buffer cache (nbc) is used. Allowed limits are. 0 <= nbc_limit >= thewall/2 0 <= nbc_pseg_limit_init >= vmker.goodpages*2 (thewall) Hence the solution is to adjust nbc_limit and nbc_pseg_limit during DLAPR memory remove.
Temporary fix
Comments
APAR Information
APAR number
IV31029
Reported component name
AIX 610 STD EDI
Reported component ID
5765G6200
Reported release
610
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Submitted date
2012-10-29
Closed date
2012-10-29
Last modified date
2013-11-26
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
U863337
Fix information
Fixed component name
AIX 610 STD EDI
Fixed component ID
5765G6200
Applicable component levels
R610 PSY U863337
UP13/11/25 I 1000
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Document Information
Modified date:
17 December 2021