[linux-dvb] Re: Removing PCI-latency settings from CVS

["Dr. Werner Fink" <werner@suse.de>]

On Fri, Aug 01, 2003 at 01:20:21PM +0200, Oliver Endriss wrote:
> >
> > Wouldn't it be better to do the calculating instead of breaking other
> > systems which do it better _with_ a latency of 64?
> 
> Sure, if someone really *knows* how to do that correctly. ;-)
> (I don't know enough about the PCI bus specs.)
> 
> I considered the following:
> - DVB kernel does not set this value.
> - If required you can simply put setpci into your local boot script.
> - Many bioses allow to specify the default latency value.
>   (64 seems to be a common default value.)
> - The value 64 produces artefacts on some systems.
> - A built-in value makes it harder to use setpci to specify the correct
>   value. You have to call setpci each time after the driver has been 
>   loaded.
> - I'm not sure whether the DVB driver ist the correct place to do it.
> 
> Anyway, if you prefer I could make it a module parameter.
> (default is 0 --> no change, otherwise set the specified value).

Yep ... would be perfect for me.  This will help to do recording and
replaying on the same card with(out|less) glitches at least on my
33MHz PCI system ;^) ... OK beside this a setpci command would
also help but requires lspci for getting the correct device/vendor.

Btw: This change was part of a patch of mine but I do not have
CVS access ;^)


      Werner


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