It would be extremely useful to have more detail of the relationship
between the Intel SYSENTER and the AMD SYSCALL instructions; however,
from the description of the latter I suspect that they are extremely
fast, but can only be used in a very specific set of circumstances,
which, however, Linux 2.1.x may either satisfy or can be fixed to
satisfy.
Anyone who either have or can obtain (through experimentation or what
have you) information about these instructions it would be incrediby
useful...
-hpa
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