[Asterisk-Dev] what's the value of a jiffie in zaptel driver ?

[Steven Critchfield]

On Mon, 2004-11-22 at 13:29 +0800, Dinesh Nair wrote:
> hi all,
> 
> i'm trying to reconcile the register settings and proslic calibration 
> procedure for the wcfxs/wctdm driver between the linux zaptel drivers and 
> the freebsd zaptel drivers. i'm pretty much sure that a lot of the problems 
> is timing (i.e. wait/sleep time) based differences and a lot of this is due 
> to the assumption of what the variable jiffie contains.
> 
> i do believe that it is the number of clock ticks, however what's the 
> frequency of the clock ticks ? is it 100 per second or 1000 per second ? 
> this has a vast difference when used in code like this:
> 
> 		origjiffies=jiffies;
> 		while((jiffies-origjiffies)<4);
> 
> is the above while looping for 4ms or 40ms ? the lack of comments in the 
> file make it difficult to port, for freebsd's clock ticks are defined by 
> the HZ kernel variable, which by default is set to 100, but can be 
> increased (and is usually increased) to 1000 for performance sensitive 
> deployments.
> 
> can anyone assist in clarifying what a jiffie is ?

I'm going to make a quick, unverified guess. It should be the one
defined in the linux kernel. Should be 100. 

-- 
Steven Critchfield <critch at basesys.com>