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Problem IC78528
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Status: Closed |
HADR IMPLEMENTATION ON HP COULD SEE HIGH CPU UTILIZATION ON THE STANDBY DUE TO A HP SPECIFIC IMPLEMENTATION OF RECV() BUFFER. |
| product: |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 |
| Problem description: |
recv() is used to retrieve data from the network (in this case,
from the HADR Primary). A typical recv() call looks like:
recv(Socket, pcBuffer, iLength, iFlag).
The retrieved data is placed in a buffer called pcBuffer. The
amount of data we want to retrieve (or can retrieve) is iLength.
A recv() call typically returns only a few KB each time. So
iLength
could be multiple GB and yet we may get only a few KB.
Currently, the HADR Standby requests as much data as there is
space for in the HADR receive buffer (which can configured over
a GB). This presents a problem on the HP operating system. At
the start of every recv() call, HP validates pcBuffer (up
through iLength) to ensure that the memory location is legal.
This requires a lot of extra work (scanning a GB of data
compared with copying a KB of data). This validation only
occurs (that we know of) on HP, so hasn't been a problem with
other platforms like Linux and AIX. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* HADR users on HP platforms *
****************************************************************
* PROBLEM DESCRIPTION: *
* Without the fix, customer could be exposed to the problem *
* described in the APAR error description *
****************************************************************
* RECOMMENDATION: *
* upgrade to product v97fp5 *
**************************************************************** |
| Local Fix: |
No Local Fix available. Please move to v97fp5 |
| available fix packs: |
DB2 Version 9.7 Fix Pack 5 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 6 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 7 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 8 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9a for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 10 for Linux, UNIX, and Windows
|
| Solution |
The fix will be delivered db2_v97fp5. Customers on HP will not
see the high cpu utilization on standby as described in the
error description. |
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 06.09.2011
12.12.2011
12.12.2011 |
| Problem solved at the following versions (IBM BugInfos) |
9.7.FP5
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.7.0.5
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