Re: [ckpatch][15/29] hz-no_default_250.patch
- From: Lee Revell <rlrevell@xxxxxxxxxxx>
- Date: Sun, 18 Jun 2006 21:30:31 -0400
On Sun, 2006-06-18 at 20:52 -0400, Albert Cahalan wrote:
Make 250 HZ a value that is not selected by default and give some
better recommendations in help.
No, 250 is a good default.
We can't reliably do 1000. There are many systems, including both
laptops and servers, which have a BIOS that uses SMM/SMI to grab
the CPU for longer than a millisecond. We'd lose clock ticks if
we had HZ at 1000.
Doesn't this become a non-issue with John Stultz's gettimeofday rework?
NTSC video is 59.94 fields per second. Though a sample rate of
double that would satisfy the Nyquest theory, in practice you
need to go to 4x to 5x the rate you want. This comes out to be
around 240 to 300 as a minimum.
Realtime audio wants higher framerates than video. Of course many of
these systems with the SMM bug are fatally broken for these
applications.
Lee
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