|
Problem IT34433
|
Status: Closed |
DRDA CLIENTS MAY SEE AN EXCEPTION IN DRDA_RECEIVE_BUFF IN A LOW/OUT OF MEMORY SITUATION
|
| product: |
INFORMIX SERVER / 5725A3900 / C10 - IDS 12.10 |
| Problem description: |
Imagine we have an environment with DRDA clients using a
DRDA_COMMBUFFSIZE setting of 2048.
The instance is restricted to 16GB by edition limits. After a
certain time the memory turns to be
fragmented in the way that the largest amount of continuous
blocks is lower then 512 Blocks needed
for the communication in DRDA even there are plenty buffers
available:
id key addr size ovhd
class blkused blkfree
9404417 52564802 4cc00000 14763950080
173016984 V* 128061 3476419
9568263 52564807 441e00000 35651584 419352
V* 135 8569
onstat -g nbm | grep larg
used = 128061, largest_free = 511
used = 135, largest_free = 511
In this case frequent af files are seen with
0x0000000000bb411e (/opt/IBM/informix/bin/oninit)
_Z17drda_receive_buff
0x0000000000bb4367 (/opt/IBM/informix/bin/oninit)
_Z15sqljcIntReceiveP10sqljCmnMgr
0x0000000000bac101 (/opt/IBM/informix/bin/oninit)
_Z14sqljcReadHdrAsP10sqljCmnMgrPt
0x0000000000ba062f (/opt/IBM/informix/bin/oninit) sqljsParse
0x0000000000b984c6 (/opt/IBM/informix/bin/oninit) do_drdamain
0x0000000000ae472a (/opt/IBM/informix/bin/oninit) drdamain
0x000000000154208b (/opt/IBM/informix/bin/oninit) spawn_thread
0x0000000001401c70 (/opt/IBM/informix/bin/oninit)
th_init_initgls
0x0000000001448997 (/opt/IBM/informix/bin/oninit) startup |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* Users of Informix Server prior to 12.10.xC15 and 14.10.xC6. *
****************************************************************
* PROBLEM DESCRIPTION: *
* You have an environment with DRDA clients using a *
* DRDA_COMMBUFFSIZE setting of 2048. *
* The instance is restricted to 16GB by edition limits. After *
* a certain time the memory turns to be *
* fragmented in the way that the largest amount of continuous *
* blocks is lower then 512 Blocks needed *
* for the communication in DRDA even though there are plenty *
* of buffers available: *
* *
* id key addr size ovhd *
* class blkused blkfree *
* 9404417 52564802 4cc00000 14763950080 *
* 173016984 V* 128061 3476419 *
* 9568263 52564807 441e00000 35651584 *
* 419352 *
* V* 135 8569 *
* *
* onstat -g nbm | grep larg *
* used = 128061, largest_free = 511 *
* used = 135, largest_free = 511 *
* *
* In this case frequent assert failure files are seen with the *
* following stack: *
* *
* (/opt/IBM/informix/bin/oninit) _Z17drda_receive_buff *
* (/opt/IBM/informix/bin/oninit) *
* _Z15sqljcIntReceiveP10sqljCmnMgr *
* (/opt/IBM/informix/bin/oninit) *
* _Z14sqljcReadHdrAsP10sqljCmnMgrPt *
* (/opt/IBM/informix/bin/oninit) sqljsParse *
* (/opt/IBM/informix/bin/oninit) do_drdamain *
* (/opt/IBM/informix/bin/oninit) drdamain *
* (/opt/IBM/informix/bin/oninit) spawn_thread *
* (/opt/IBM/informix/bin/oninit) th_init_initgls *
* (/opt/IBM/informix/bin/oninit) startup *
****************************************************************
* RECOMMENDATION: *
* Upgrade to Informix Server 12.10.xC15 (when available) or *
* 14.10.xC6 (when available). *
**************************************************************** |
| Local Fix: |
|
| Solution |
|
| Workaround |
****************************************************************
* USERS AFFECTED: *
* Users of Informix Server prior to 12.10.xC15 and 14.10.xC6. *
****************************************************************
* PROBLEM DESCRIPTION: *
* You have an environment with DRDA clients using a *
* DRDA_COMMBUFFSIZE setting of 2048. *
* The instance is restricted to 16GB by edition limits. After *
* a certain time the memory turns to be *
* fragmented in the way that the largest amount of continuous *
* blocks is lower then 512 Blocks needed *
* for the communication in DRDA even though there are plenty *
* of buffers available: *
* *
* id key addr size ovhd *
* class blkused blkfree *
* 9404417 52564802 4cc00000 14763950080 *
* 173016984 V* 128061 3476419 *
* 9568263 52564807 441e00000 35651584 *
* 419352 *
* V* 135 8569 *
* *
* onstat -g nbm | grep larg *
* used = 128061, largest_free = 511 *
* used = 135, largest_free = 511 *
* *
* In this case frequent assert failure files are seen with the *
* following stack: *
* *
* (/opt/IBM/informix/bin/oninit) _Z17drda_receive_buff *
* (/opt/IBM/informix/bin/oninit) *
* _Z15sqljcIntReceiveP10sqljCmnMgr *
* (/opt/IBM/informix/bin/oninit) *
* _Z14sqljcReadHdrAsP10sqljCmnMgrPt *
* (/opt/IBM/informix/bin/oninit) sqljsParse *
* (/opt/IBM/informix/bin/oninit) do_drdamain *
* (/opt/IBM/informix/bin/oninit) drdamain *
* (/opt/IBM/informix/bin/oninit) spawn_thread *
* (/opt/IBM/informix/bin/oninit) th_init_initgls *
* (/opt/IBM/informix/bin/oninit) startup *
****************************************************************
* RECOMMENDATION: *
* Upgrade to Informix Server 12.10.xC15 (when available) or *
* 14.10.xC6 (when available). *
**************************************************************** |
| Comment |
Fixed in Informix Server 12.10.xC15 and 14.10.xC6. |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 02.10.2020
25.01.2021
25.01.2021 |
| Problem solved at the following versions (IBM BugInfos) |
|
| Problem solved according to the fixlist(s) of the following version(s) |
