Joseph Koshy wrote:
jkoshy 2007-11-29 06:43:59 UTC
FreeBSD src repository
Modified files:
sys/dev/hwpmc hwpmc_x86.c
Log:
Revert revision 1.4.
Intel CPUs with family 0x6, model 0xE and later (i.e., Intel Core(TM))
have a PMC architecture that differs somewhat from previous CPUs in
family 0x6. Even though the basic programming model is similar, the
documented set of legal values that may be loaded into their PMC MSRs
differs from that of the previous PMCs in family 0x6 and reusing bit
values valid for the older PMCs could result in undefined behaviour in
the general case.
Revision Changes Path
1.6 +1 -1 src/sys/dev/hwpmc/hwpmc_x86.c
What is your expected timeline for fixing this and the other missing CPU
family support (Intel Woodcrest, etc)? It's a serious limitation to not
be able to run hwpmc on modern CPUs, and I argue that a partial
implementation is much better than no implementation.
Kris
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