Bug 42090

Bug: 42090

Impact:

Product:

GemStone/S

Versions:

6.6.1, 6.6, 6.5.8, 6.5.7.5, 6.5.7, 6.5.6, 6.5.5, 6.5.4, 6.5.2, 6.5.1, 6.5, 6.3.1, 6.3, 6.2.x, 6.2, 6.1.6, 6.1.5

Platform:

AIX on POWER7

Fixed In:

6.6.2

Problems with AIX on POWER7

The POWER7 chip provides more aggressive prefetch of data and instructions.
This requires additional memory barriers on atomic updates within GemStone,
to avoid the risk of coherency and audit problems.

These problems are exposed under heavy load on GemStone. It is unlikely
that this bug would cause problems in non-production use.