[mythtv] Re: [mythtv-commits] mythtv commit: r7209 by danielk

Stuart Auchterlonie stuarta at squashedfrog.net
Thu Sep 8 17:04:39 UTC 2005

On Thu, Sep 08, 2005 at 12:57:00PM -0400, Daniel Kristjansson wrote:
> On Thu, 2005-09-08 at 17:38 +0100, Stuart Auchterlonie wrote:
> > Still not correct in 7211.
> > You should stick with passing in 5000ms and do
> I want 5 ms not 5000 ms. 5 ms is a LONG time for a computer running at
> greater than about 4.7 Mhz... i.e. anything post 8086. :)

The 5000ms was rather arbitrary anyway. :-)
I was thinking in terms of how long it might take to move
a satellite dish.

Technically you will still need to update the timeout setup.
It breaks for anything over 1000.

> All we really want to do is wait for a context switch to the kernel
> and back. As soon as we yield the backend driver should pick up the
> frontend command and write to a few i/o ports on the card and then
> return. The reason we don't just do a 50 ns sleep is because we want
> a yield and not a busy wait loop. A 5 ms sleep also lets the kernel
> do any other stuff it must do, such as set up DMA for disk writes,
> reschedule the thread priorities, etc.

This makes sense.


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