The fix for bug #33833 introduced a call to the MFENCE processor
instruction, which is part of the Intel SSE2 instruction set
extensions; this instruction is not available on the Pentium III,
or the Xeon with a Pentium III core.
Therefore, GemStone/S 6.1.5 and later require an Intel CPU with
Pentium IV or newer core, or an equivalent AMD CPU that supports
SSE2. Recent versions of GemStone/S will not run on Linux machines
with older processors.
Although GemStone/S for Windows runs on the same processor, the
process protection uses a different technique and does not call
MFENCE; so Windows is not affected.
Last updated: 12/3/07