Recent update to RELENG_6 creates lots of calcru warnings

[Kris Kennaway]

James Long wrote:
> On Sun, Sep 02, 2007 at 01:18:05PM +0200, Kris Kennaway wrote:
>> James Long wrote:
>>> I'm running FreeBSD RELENG_6 on a Compaq DL380 G2 dual PIII-1.4GHz with an 
>>> SMP kernel.  dmesg below.
>>> Prior to about August 12, the system had been quite stable.
>>> Since that time, I am finding lots of calcru warnings, which often
>>> cause system services to fail when they see unorthodox time shifts.
>>> Section 5.19 of the handbook appears not to be current any longer,
>>> suggesting setting kern.timecounter.method=1.  
>>> kern.timecounter.hardware=i8254 also does not improve things.
>>> Other suggestions?
>>> Thanks,
>>> Jim
>>> Sep  1 18:00:30 ns sudo:    james : TTY=ttyp0 ; 
>>> PWD=/usr/local/www/sites/com.umpquanet/support ; USER=root ; 
>>> COMMAND=/sbin/sysctl -w kern.timecounter.hardware=i8254
>>> Sep  1 18:02:44 ns kernel: calcru: runtime went backwards from 1343309 
>>> usec to 1178478 usec for pid 3663 (hpasmd)
>>> Sep  1 18:02:44 ns kernel: calcru: negative runtime of -1274607 usec for 
>>> pid 3660 (hpasmd)
> 
> ... big snip ...
> 
>> Does reverting to the older kernel work?  If so, can you isolate which 
>> commit caused the problem by doing a binary search of date ranges?  This 
>> should be easy to do since the rate of changes to RELENG_6 is low.
>>
>> Kris
> 
> Please pardon the rookie question, but the machine is not blazingly 
> fast to build (circa 90 minute world, 20 min. kernel).  For the 
> purposes of the binary search, may I build just the kernel, and would 
> you suggest leaving the up-to-date world and running against a 
> slightly older kernel as I test, or should I roll the world back to 
> early August, and test against a slightly new kernel -- or will it 
> matter?
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> 

You should only need to rebuild the kernel when searching.

Kris