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Date: Wed, 23 Jan 2008 20:15:48 +0100
From: Kris Kennaway <kris@FreeBSD.org>
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To: Stefan Lambrev <stefan.lambrev@moneybookers.com>
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Cc: freebsd-hackers@FreeBSD.org
Subject: Re: gettimeofday() in hping
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Stefan Lambrev wrote:
> Hi Kris,
> 
> Kris Kennaway wrote:
>> Stefan Lambrev wrote:
>>>
>>> Kris Kennaway wrote:
>>>> Stefan Lambrev wrote:
>>>>
>>>>>> You should use hwpmc to verify where the application is really 
>>>>>> spending time, since gettimeofday doesn't seem to account for it all.
>>>>> pmc: Unknown Intel CPU.
>>>>> module_register_init: MOD_LOAD (hwpmc, 0xffffffff8029906d, 
>>>>> 0xffffffff8054c500) error 78
>>>>
>>>> OK, this is the famous problem with modern CPUs that jkoshy has 
>>>> declined to work around :(  There are patches for this in perforce, see
>>>>
>>>> http://perforce.freebsd.org/changeView.cgi?CH=126189
> I got hwpmc to compile (but only as module)
> hwpmc: TSC/1/0x20<REA> P6/2/0x1ff<INT,USR,SYS,EDG,THR,REA,WRI,INV,QUA>
> but when I try to use pmcstat I receive this error message:
> pmcstat: ERROR: Initialization of the pmc(3) library failed: Device not 
> configured
> 
> kldstat lists hwpmc.ko as loaded and I have options HWPMC_HOOKS in my 
> kernel.
> 
> Any idea what's go wrong?
> 

You also need changes to the userland libpmc and pmcstat.  They should 
also be in that (or related) p4 changeset though.

Kris