Re: swapready

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Sharon Clay (src++at++rose.engr.sgi.com)
Wed, 17 Jun 1998 02:27:58 -0700

+>---- On Jun 17, 7:49am, Mark Lewis wrote:
> Subject: Re: swapready
->From guest++at++holodeck Tue Jun 16 23:54:00 1998
->
->Beware: I have experienced a severe problem with PFCHAN_SWAPBUFFERS_HW
->using Performer 2.2. I found that my application, when running
->multi-pipe and compiled with Performer 2.2, ran at a miserable 0.7 Hz,
->while the same application compiled with Performer 2.1 ran at 60 Hz.

FYI, Performer2.1 didn't have PFCHAN_SWAPBUFFERS_HW implemented so you
were not getting HW synchronization.

->When I removed the PFCHAN_SWAPBUFFERS_HW bit from the pfChanShare call,
->I got 60 Hz again (with 2.2). I know that I am not the only one to
->experience this problem, and would appreciate any comments / solutions.

First to check is that you have up to date Onyx2 X patches since there
were some late 6.4 X fixes in regard to swap ready.
If you are running at 1 Hz on up to date system software, then another
cause could be that somehow, one of the
pfPipes is not getting synced. If this is the case, it will be
very evident with output from setting your PFNFYLEVEL environment
variable to 9 and looking at the output which you can send me.
If that is the problem, then there will a simple WAR for the immediate
present.

src.

->
->Jean-Claude Bachmann wrote:
->>
->> I would like to synchronize buffer swapping of a couple of pfChannels
->> using channel groups, sharing the PFCHAN_SWAPBUFFERS_HW bit.
->>
->> Is it sufficient to wire the swapready connectors on the pipes of a
->> Onyx2 or do I have to genlock the pipes as well?
->>
->> If genlocking is required, I remember that somebody offered a map of
->> pin assignments for the special SGI video cable that is needed which
->> seems to be quite expensive ;-). Who was it?
->>
->> By the way I was trying to ftp the monthly archives, and the archiving
->> kind of stopped last year. Did the archive move?
->>
->> J.C.
->>
->>
->> --
->>
->> ********************************************************************
->> * Artemedia GmbH | Tel.: +49 [0]30 25443 - 0 *
->> * Jean-Claude Bachmann | Tel.: +49 0172 - 219 13 76 *
->> * Hardenbergplatz 2 | Fax.: +49 [0]30 25443 - 400 *
->> * D-10623 Berlin | email: jean-claude.bachmann++at++artemedia.de *
->> * Germany | Web Page http://www.artemedia.de *
->> ********************************************************************
->>
->>
->
->--
->Mark C Lewis
->Principal Development Engineer
->Equipe Electronics Ltd.
->13 Liverpool Gardens
->Worthing, W. Sussex
->BN11 1RY
->ENGLAND
->
->Phone +44 (0) 1903 216622
->FAX +44 (0) 1903 216633
->
->mailto:markl++at++equipe.ltd.uk
->http://www.equipe.ltd.uk
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->
+>---- End of excerpt from Mark Lewis

-- 
-----{-----{---++at++   -----{----{---++at++   -----{----{---++at++   -----{----{---++at++
Sharon Rose Clay - Silicon Graphics, Advanced Systems Dev.
src++at++sgi.com  (650) 933 - 1002  FAX: (650) 965 - 2658  MS 8U-590
-----{-----{---++at++   -----{----{---++at++   -----{----{---++at++   -----{----{---++at++
=======================================================================
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