Joseph Koshy wrote:
Also I tried to find what else is slow in FreeBSD, I tried hwpmc as
module and in kernel, but it fails with error:
pmc: Unknown Intel CPU.
module_register_init: MOD_LOAD (hwpmc, 0xffffffff804833e0,
0xffffffff809338a0) error 78
There are patches you need to enable it on woodcrest. They are in my p4
branch (kris-contention) but I don't have time right now to extract them.
These patches make hwpmc treat these CPUs are possessing Pentium-Pro class
PMCs.
Unfortunately, this is easy to do, but incorrect:
- There are differences in the legal bit values that may be loaded into
PMC registers for many hardware events.
- hwpmc needs to be taught to support measurements on CPUs with
multiple cores per package.
And then there is additional work to support these CPUS
at the same level as the current set:
- The hardware events supported are named differently; documentation,
libpmc's event selector parsing code need to be changed to suit.
- The hardware supports a new class of "fixed function" PMCs that
hwpmc needs to support.
Well, this is all true, but overlooks the point that it does minimally
work, which is of critical importance to people with one of these CPUs
who want to actually use your tool ;)
Kris
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