[mythtv-users] setpci [was Re: My HDTV woes]

Robert Tsai rtsai1111 at comcast.net
Fri Apr 7 23:03:00 UTC 2006


On Mon, Apr 03, 2006 at 01:50:53PM -0400, Daniel Kristjansson wrote:
> On Mon, 2006-04-03 at 11:02 -0500, leland sindt wrote:
> > > Also if you have an nVidia or ATI card lower the pci latency
> > > timer to 60 with setpci (see also lspci). My command:
> > >
> > >   setpci -v -s 01:00.0 latency_timer=60
> >
> > Can you provide some justification/evidence for changing the
> > latency timer for your nVidia card?  What have you seen to show
> > that it does not need the full 'ff' value?
> 
> You don't need the full bandwidth for the graphics when running
> mythtv, and allowing the video card to monopolize the PCI bus
> prevents other high bandwidth devices like your HDTV card from using
> the bus. You may not need to do this, but it can help, especially if
> you have multiple HDTV cards.
> 
> I've found that this makes for a more responsive system, even when
> you are playing a graphics intensive game. Though absolute fill
> rates suffer a few percentage points.

Daniel, do you have an AGP or PCI (or PCI-E) video card? I'm thinking
of the comment in this post that possibly implies this "setpci" trick
might not help for AGP video cards (not that I have any expertise in
this subject):

	http://www.gossamer-threads.com/lists/mythtv/users/78248#78248

--Rob
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