HWPMC is Broken :(

[MaxDev]

Hello,

Here we go :

pmc: Unknown Intel CPU.
module_register_init: MOD_LOAD (hwpmc, 0xffffffff806153fd, 0xffffffff80c050e0) error 78

I have a Dual Intel Xeon E5-2650, and hwpmc, refuses to attach.

Anybody knows any solution ?

FreeBSD 8.3 by here.

 

[cpm@]

What steps will reproduce the problem? On what CPU?

This wiki page describes briefly the process of adding support for a new class of PMC to FreeBSD's hwpmc(4)/libpmc(3):
http://wiki.freebsd.org/PmcTools/PmcHardwareHowTo.

 

[MaxDev]

I got lost :|

 

[cpm@]

Show your output:
[CMD=]# sysctl -a | grep hw.machine[/CMD]

 

[MaxDev]

hw.machine: amd64
hw.machine_arch: amd64

 

[MaxDev]

hw.model: Intel(R) Xeon(R) CPU E5-2650 0 @ 2.00GHz

 

[cpm@]

Log:
MFC r237196:

Disable hwpmc(4) support for Intel Xeon Sandy Bridge (Model 0x2D).
Due to some differences in MSRs between Xeon Sandy Bridge and Core Sandy
Bridge (Model 0x2A), wrmsr() may generate in a GP# fault exception and so a
panic of the machine.

http://lists.freebsd.org/pipermail/svn-src-stable-9/2012-June/002205.html.

 

[MaxDev]

And what to do now ?

 

[cpm@]

pmc: Unknown Intel CPU.
module_register_init: MOD_LOAD (hwpmc, 0xffffffff806153fd, 0xffffffff80c050e0) error 78

This problem happens with modern CPUs, in your case, hwpmc(4) doesn't support your Sandy Bridge-E CPU.

 

[MaxDev]

I can see this clearly, but how i'll profile the kernel now ?

 

[cpm@]

I can see this clearly, but how i'll profile the kernel now ?

I really suggest taking a look at the various related thread on the freebsd-current mailing list.