Re: No Genlock Warning

New Message Reply Date view Thread view Subject view Author view

From: Lee Marden (Lee_Marden++at++res.raytheon.com)
Date: 04/02/2001 07:49:39

Tze Lin,

  I'm having graphics stress related issues with my application on this
3 pipe (6 channel) system. My understanding is that if the
pipes/channels are not synchronized correctly, then delays can be
introduced in the rendering process. Since both perfly and my app issue
this "No Genlock" warning, I thought that maybe my throughput issues
might be related. I know my application is not setup, nor designed for,
gangdraw. I've been told that I don't need gangdraw to optimally render
on this hardware. However, I would like to get rid of this warning if
possible. So... I'd like to know if the "No Genlock" message is truly
genlock (i.e. video display) related, or if it's something more
substantial, and the graphics pipes are out of alignment, and it's
effecting my performance (cull/draw times, etc.).

Thanks for your help,
Lee

Ong Tze Lin wrote:
>
> Hi Lee,
>
> Yup, Genlock locks the pipe to ensure they all
> generate video frames at the same time. Yes, this can
> also be used to ensure sync with the display device.
>
> Gangdraw OTOH makes sure they all swap buffers at
> exactly the same time. This feature requires
> you to cable up the Swap Ready ports on your
> graphics hardware.
>
> So- for a fully synchronised hardware setup, you'd
> connect up both genlock and swap ready.
>
> I'm not sure where exactly this check is performed,
> although its bound to be at a very low level.
>
> Is there any particular reason you're looking for
> this message? If you're looking just to disable it,
> then use PFNFYLEVEL.. it will always appear when
> multiple unsynchronized pipes are detected...
>
> Cheers,
> Tze Lin
>
> --
> Ong Tze Lin Tel/VNET: +65 771 0219
> Principal Consultant Mobile : +65 9832 7125
> SGI Asia Pacific Fax : +65 779 3650
> 89 Science Park Dr, #03-03/05, Singapore 118261
>
> On Thu, 29 Mar 2001, Lee Marden wrote:
>
> > Thanks. When you mean hardware genlock between the pipes, are talking
> > gangdraw between the pipes? My understanding is that gangdraw is
> > responsible for synching between pipes, while genlock is for synching to
> > an external video, such as the projectors. I believe this message is
> > coming from Performer, but I don't know what sub-system, or library.
> > Would you know the name of the part of Performer that's checking for
> > this?
> >
> > Thanks,
> > Lee
> >
> > Ong Tze Lin wrote:
> > >
> > > Hi Lee,
> > >
> > > Just means you don't have hardware genlock between
> > > your pipes. Your channels are still sync'ed
> > > internally, which may or may not be adequate for
> > > your simulation needs.
> > >
> > > Cheers,
> > > Tze Lin
> > >
> > > --
> > > Ong Tze Lin Tel/VNET: +65 771 0219
> > > Principal Consultant Mobile : +65 9832 7125
> > > SGI Asia Pacific Fax : +65 779 3650
> > > 89 Science Park Dr, #03-03/05, Singapore 118261
> > >
> > > On Wed, 28 Mar 2001, Lee Marden wrote:
> > >
> > > > pfUsers,
> > > >
> > > > I'm getting a warning when I run perfly, that indicates that there is
> > > > a problem with genlock across my three pipes. I use the following to
> > > > setup the three MCOs (2 channels each):
> > > >
> > > > ---
> > > > set DISPLAY=:0.0
> > > > /usr/gfx/setmon -x -S -p 0 2++at++1025x768_60
> > > > set DISPLAY=:0.1
> > > > /usr/gfx/setmon -g -x -S -p 1 2++at++1025x768_60
> > > > set DISPLAY=:0.2
> > > > /usr/gfx/setmon -g -x -S -p 2 2++at++1025x768_60
> > > >
> > > > /usr/gfx/stopgfx; /usr/gfx/startgfx &
> > > > ---
> > > >
> > > > The scene looks ok, so I know that the MCOs are working, but I get the
> > > > following warnings:
> > > > 17724 PF Warning/Resource: !!!!!!!!!!!!!!!!!! NO GENLOCK
> > > > !!!!!!!!!!!!!!!!!!!!!!
> > > > 17724 PF Warning/Resource: Screen 1 is phase-shifted 68.657346
> > > > degrees from master screen 0.
> > > > 17724 PF Warning/Resource: !!!!!!!!!!!!!!!!!! NO GENLOCK
> > > > !!!!!!!!!!!!!!!!!!!!!!
> > > > 17724 PF Warning/Resource: !!!!!!!!!!!!!!!!!! NO GENLOCK
> > > > !!!!!!!!!!!!!!!!!!!!!!
> > > > 17724 PF Warning/Resource: Screen 2 is phase-shifted 78.312222
> > > > degrees from master screen 0.
> > > > 17724 PF Warning/Resource: !!!!!!!!!!!!!!!!!! NO GENLOCK
> > > > !!!!!!!!!!!!!!!!!!!!!!
> > > >
> > > > I've looked through the perfly code and can't find this message. Is
> > > > this a Performer message? Any ideas what might be causing this? Should
> > > > I be concerned?
> > > >
> > > > Thanks,
> > > > Lee
> > > > --
> > > > ------------------------------------------------------------------------
> > > > Lee Marden Raytheon Company
> > > > Principal Software Engineer Northeast C3I Systems
> > > > Advanced Modeling & Simulation 50 Apple Hill Dr. (T3MJ21)
> > > > Technology Section Tewksbury, MA 01876
> > > > Phone: (978) 858-9487 Fax: (978) 858-4336
> > > > Email:lee_marden++at++raytheon.com Intranet: http://amasts.msd.ray.com/~lms
> > > > ------------------------------------------------------------------------
> > > > -----------------------------------------------------------------------
> > > > List Archives, FAQ, FTP: http://www.sgi.com/software/performer/
> > > > Open Development Project: http://oss.sgi.com/projects/performer/
> > > > Submissions: info-performer++at++sgi.com
> > > > Admin. requests: info-performer-request++at++sgi.com
> > > >
> >
> > --
> > ------------------------------------------------------------------------
> > Lee Marden Raytheon Company
> > Principal Software Engineer Northeast C3I Systems
> > Advanced Modeling & Simulation 50 Apple Hill Dr. (T3MJ21)
> > Technology Section Tewksbury, MA 01876
> > Phone: (978) 858-9487 Fax: (978) 858-4336
> > Email:lee_marden++at++raytheon.com Intranet: http://amasts.msd.ray.com/~lms
> > ------------------------------------------------------------------------
> >
>
> -----------------------------------------------------------------------
> List Archives, FAQ, FTP: http://www.sgi.com/software/performer/
> Open Development Project: http://oss.sgi.com/projects/performer/
> Submissions: info-performer++at++sgi.com
> Admin. requests: info-performer-request++at++sgi.com 

-- 
------------------------------------------------------------------------
Lee Marden                     Raytheon Company
Principal Software Engineer    Northeast C3I Systems
Advanced Modeling & Simulation 50 Apple Hill Dr. (T3MJ21)
Technology Section             Tewksbury, MA  01876      
Phone:  (978) 858-9487         Fax:  (978) 858-4336
Email:lee_marden++at++raytheon.com  Intranet: http://amasts.msd.ray.com/~lms
------------------------------------------------------------------------

New Message Reply Date view Thread view Subject view Author view

This archive was generated by hypermail 2b29 : Mon Apr 02 2001 - 07:50:23 PDT

This message has been cleansed for anti-spam protection. Replace '++at++' in any mail addresses with the '@' symbol.