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Subject: Re: hangs using opengl
From: "Nix N. Nix" <nix@go-nix.ca>
To: vda@port.imtp.ilyichevsk.odessa.ua
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <200201171926.g0HJQUE19410@Port.imtp.ilyichevsk.odessa.ua>
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	<1011294257.13517.1.camel@tux> 
	<200201171926.g0HJQUE19410@Port.imtp.ilyichevsk.odessa.ua>
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Date: 17 Jan 2002 16:38:32 -0500
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On Thu, 2002-01-17 at 18:26, Denis Vlasenko wrote:
> On 17 January 2002 17:03, Nix N. Nix wrote:
> > > Via has recently released a patch to Via-chipset based boards that
> > > addresses issues Windows XP users have been experiencing (BSODs and
> > > friends) while playing OpenGL games, especially with NVidia chips.  The
> > > problem and the description of the fix (as taken from the Readme.txt
> > > from Via's patch) are as follow:
> > >
> > > So what does it do? It closes the RX55 memory register in BIOS. The RX55
> > > register's official name and function is Memory Write Queue (MWQ) timer.
> > > The MWQ timer is actually a timing device included in the memory host
> > > controller to prevent write data being held in the memory queue too
> > > long. After the data has been in the queue too long it times out. This
> > > timed out data is then given a higher write request priority. Now that
> > > might sound nice a bit of extra performance BUT the procedure fails when
> > > overloaded. 3D games and Win XP put too much load on the memory queuing
> > > timer procedure. The nVidia new driver exaggerates the problem even more
> > > as the driver enables nVidia cards to use even more memory than previous
> > > driver versions.
> 
> [snip]
> 
> > > In light of VIAs discoveries, and the fact that the patch that they now
> > > have available for Windows is not available for Linux also, I was
> > > wondering if somebody on this list may be kind enough to help us with
> > > what may very well be the symptoms of the same problem, but on Linux.
> > > Could the code that accomplishes the above (turn off the RX55 register)
> > > be made into a patch that can be applied to the kernel, thus providing
> > > an equivalent patch for Linux systems ?
> 
> Athlon bug stomper is already in mainline. If latest kernel does not work for 
> you, check that register (man lspci) and 0x95 also. Try to disable them (man 

I did lspci -vv -xxx
Each entry is followed by a table of hex.  Is it entries 0x55 and 0x95
in that table that you're referring to ? If so, well, they're both 0:

01:00.0 VGA compatible controller: nVidia Corporation NV11 (rev a1)
(prog-if 00 [VGA])
        Subsystem: Asustek Computer, Inc.: Unknown device 4015
        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 (1250ns min, 250ns max)
        Interrupt: pin A routed to IRQ 11
        Region 0: Memory at ee000000 (32-bit, non-prefetchable)
[size=16M]
        Region 1: Memory at f0000000 (32-bit, prefetchable) [size=128M]
        Expansion ROM at efff0000 [disabled] [size=64K]
        Capabilities: [60] 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: [44] AGP version 2.0
                Status: RQ=31 SBA- 64bit- FW+ Rate=x1,x2
                Command: RQ=31 SBA- AGP+ 64bit- FW- Rate=x2
00: de 10 10 01 07  00  b0 02 a1 00 00 03 00 f8 00 00
10: 00 00 00 ee 08  00  00 f0 00 00 00 00 00 00 00 00
20: 00 00 00 00 00  00  00 00 00 00 00 00 43 10 15 40
30: 00 00 00 00 60  00  00 00 00 00 00 00 0b 01 05 01
40: 43 10 15 40 02  00  20 00 17 00 00 1f 02 01 00 1f
50: 01 00 00 00 01 [00] 00 00 ce d6 23 00 0f 00 00 00
60: 01 44 02 00 00  00  00 00 00 00 00 00 00 00 00 00
70: 00 00 00 00 00  00  00 00 00 00 00 00 00 00 00 00
80: 00 00 00 00 00  00  00 00 00 00 00 00 00 00 00 00
90: 00 00 00 00 00 [00] 00 00 00 00 00 00 00 00 00 00
a0: 00 00 00 00 00  00  00 00 00 00 00 00 00 00 00 00
b0: 00 00 00 00 00  00  00 00 00 00 00 00 00 00 00 00
c0: 00 00 00 00 00  00  00 00 00 00 00 00 00 00 00 00
d0: 00 00 00 00 00  00  00 00 00 00 00 00 00 00 00 00
e0: 00 00 00 00 00  00  00 00 00 00 00 00 00 00 00 00
f0: 00 00 00 00 00  00  00 00 00 00 00 00 00 00 00 00

> setpci). Report back - we may need to further improve stomper.
> --
> vda
> 


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