[Savage40] 3D Support for SuperSave IX/C SDR

Tue Oct 5 15:00:19 PDT 2004

--- Hassan Aurag <aurag at cae.com> wrote:

> Hi alex,
> 
> I downloaded the latest stuff (xorg cvs) and just wanted to say
> thanks
> again. It's really cool.
> 
> I have one question  and one bug report though ;-)
> 
> 1- question: how does the caluclation goes as resolution/depth vs
> video
> memory to get both my screens dri'ed.

The DRI doesn't work with "regular" xinerama multi-head which is what I
committed to xorg cvs.  xinerama and multi-head have issues with the
DRI that I won't get into here.  The DRI will eventually work with
dualhead once I merge my savage MergedFB code.  It will follow the
behavior of mergedfb in the radeon and sis drivers in xorg cvs.

Unfortunately since the DRI does not allocate back and depth buffers
per drawable, it has pretty hefty memory requirements.  you need 
virtualx res * virtualy res * bytes/pixel * 3 = bytes required for 3d
and that's just for the front, back, and depth buffers.  you also need
space for hwcursor and BCI buffer. It's nice to have some space for
textures as well, although they can be stored in AGP memory if need be.

so for a 1024x768 desktop at 16 bpp you have:
1024*768*2 bytes*3 buffers = ~4.6 Megs
with dualhead (two desktops of 1024x768 @ 16 bpp) you'd need:
2 screens*1024*768*2 bytes*3 buffers = ~9.2 Megs

eventually once we get a new memory manager in the drm we can look at
allocating per drawable which will alleviate the heavy requirements.

> 2- Bug report: I have been experiencing this problem for a while now
> and not
> just with cvs xorg but also with previous versions too. Mozilla will
> sometimes hang X and the only way to get out is to actually switch to
> a
> console then kill mozilla or any mozilla based browser (epiphany,
> firefox
> ....). The switching (to console) always takes huge amounts of time,
> but
> there does not seem to be any real activity going on. And everytime
> it was
> when my browser was on screen 1. I'm using dual head with clone
> option and
> not spanning option. I am attaching a zipped version of
> Xorg.0.log.old to
> see if this helps. 

I'm not sure I understand exactly what clone mode you are talking about
here.  Clone support isn't available in xorg yet (that'll come with
mergedfb).  it's either dual or single head.  Maybe you are running
dualhead without xinerama.  in that case gnome or kde starts on both
heads, which I suppose could be seen as a cloned desktop.  that said,
you here are a few things you might try:

- set AGPMode to 2x or 4x.  Some people report problems in 1x mode.

- set the shadowstatus option on both devices.  some chips hang when
reading the regular status register.

- try disabling certain XAA routines. use the XaaNo... options on each
screen.  See the xorg.conf or XF86Config man pages.

Alex

> 
> -----Original Message-----
> From: savage40-bounces at probo.com [mailto:savage40-bounces at probo.com]
> On
> Behalf Of Alex Deucher
> Sent: Tuesday, September 28, 2004 12:39 PM
> To: Martin Steigerwald; savage40 at probo.com
> Subject: Re: [Savage40] 3D Support for SuperSave IX/C SDR
> 
> 
> 
> --- Martin Steigerwald <Martin at lichtvoll.de> wrote:
> 
> > 
> > Hello,
> > 
> > Does the most recent Savage driver support the 3D hardware of this
> > graphics controller?
> 
> Yes.  Although you'll need to use xorg cvs.  xorg 6.8.0/1 did not
> include 3d
> support.  It will also support dualhead once I commit my latest
> patch.
> 
> In order to build you'll need to check out xorg cvs:
> http://www.freedesktop.org/XOrg/CvsPage
> then add:
> #define BuildDevelDRIDrivers YES
> to your xc/config/cf/host.def
> then build the tree (change to xc and run 'make World'). Install the
> newly
> built tree (change to xc and run 'make install' as root). finally
> build and
> install the savage drm change to xc/extras/drm/linux and run 'make',
> then
> copy the resulting savage.o (2.4 kernel) or savage.ko (2.6 kernel) to
> the
> apporiate place in your kernel modules tree (usually
> /lib/modules/$KERNEL_VERSION/kernel/drivers/char/drm/) and run
> 'depmod -a'.
> you'll need a copy of your current kernel source installed.  on 2.4
> you'll
> also have to run 'make dep' on your kernel tree or the drm won't
> build.
> 
> good luck.
> 
> Alex
> 
> 
> > 
> > 0000:01:00.0 0300: 5333:8c2e (rev 05)
> > 0000:01:00.0 VGA compatible controller: S3 Inc. SuperSavage IX/C
> SDR 
> > (rev
> > 05) (prog-if 00 [VGA])
> >         Subsystem: IBM ThinkPad T23 (2647-4MG)
> >         Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
> > ParErr- Stepping- SERR- FastB2B-
> >         Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium
> > >TAbort-
> > <TAbort- <MAbort- >SERR- <PERR-
> >         Latency: 248 (1000ns min, 63750ns max), Cache Line Size:
> 0xff
> > 
> > (1020 bytes)
> >         Interrupt: pin A routed to IRQ 11
> >         Region 0: Memory at c0100000 (32-bit, non-prefetchable)
> > [size=512K]
> >         Region 1: Memory at e8000000 (32-bit, prefetchable)
> > [size=64M]
> >         Region 2: Memory at e4000000 (32-bit, prefetchable)
> > [size=64M]
> >         Region 3: Memory at e0000000 (32-bit, prefetchable)
> > [size=32M]
> >         Capabilities: [dc] Power Management version 2
> >                 Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA 
> > PME(D0-,D1-,D2-,D3hot-,D3cold-)
> >                 Status: D0 PME-Enable- DSel=0 DScale=0 PME-
> >         Capabilities: [80] AGP version 2.0
> >                 Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA- ITACoh-
> GART64-
> > 
> > HTrans- 64bit- FW- AGP3- Rate=x1,x2,x4
> >                 Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64-
> 64bit-
> > FW-
> > Rate=<none>
> > 
> > >From what I found via Google 3D is not yet supported. But maybe
> that
> > 
> > information is outdated.
> > 
> > Regards,
> > --
> > Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
> 
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> 

> ATTACHMENT part 2 application/octet-stream name=Xorg.0.log.old.zip

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