cvs commit: src/sys/kern subr_param.c

[Nate Lawson]

Max Laier wrote:
> On Saturday 06 November 2004 17:37, Ruslan Ermilov wrote:
>>On Sat, Nov 06, 2004 at 11:33:43AM +0000, Poul-Henning Kamp wrote:
>>
>>>phk         2004-11-06 11:33:43 UTC
>>>
>>>  FreeBSD src repository
>>>
>>>  Modified files:
>>>    sys/kern             subr_param.c
>>>  Log:
>>>  Increase default HZ for i386 to 1000
>>>
>>>  Revision  Changes    Path
>>>  1.65      +6 -4      src/sys/kern/subr_param.c
>>
>>What's the motivation for this change?  Also, NOTES
> 
> This has been discussed here:
> http://lists.freebsd.org/pipermail/freebsd-arch/2004-November/003085.html

I was traveling out of the country so I didn't get a chance to comment. 
  The two caveats I'm aware of is a slight loss in processes that are 
CPU bound and an audio hum from ACPI CPU idling.  The latter is rather 
interesting actually.  At hz=100, it's just a quiet low buzz but at 
1000, it is readily audible on many laptops and annoying.  Windows uses 
hz=1000 too and has the same problem.  I believe it's related to the 
capacitors and other devices charging/discharging when clocks are stopped.

I'm fine with this change and just wanted to make sure people know where 
these behavioral changes are coming from when reports come in.

-- 
Nate