Mailing List Archive

On Fri, 23 Jun 2006 17:16:47 -0700, Mark <list@onnow.net> wrote:

> I have set up several Mythboxes before no problem. ( 32 bit and PVR
> 250's )
>
> This time, I have an athlon 64 ( FC5 X64 version ) and a PVR 500.
>
> I am getting no where with this setup so far ( any volunteers for
> assistance? )
> If I rmmod ivtv and modprobe ivtv then I can capture raw off /dev/video0
> and /dev/video1
> But then it seems to hang after a bit and I have to rmmod it.
>
> Should I just be going with the 32 bit OS?
>
> Some assistance to get past this would be appreciated. I have never run
> into this many issues in the past.

I have an Athlon64 and I gave up on 64-bit with FC2. I'm now running
FC4-32bit with no problem. Unfortunately, 64bit just isn't there yet,
especially on Fedora. It should be, though. What a great opportunity for
Linux to beat the pants off of Windows.

brad
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How about the 64 bit mythtv rpms from atrpms? They are there, but are they
just too problematic ( ivtv ) to use?


----- Original Message -----
From: "Brad Fuller" <bradallenfuller@yahoo.com>
To: "Discussion about mythtv" <mythtv-users@mythtv.org>
Sent: Friday, June 23, 2006 6:26 PM
Subject: Re: [mythtv-users] Myth and 64 bit OK? Seeing too many issues


On Fri, 23 Jun 2006 17:16:47 -0700, Mark <list@onnow.net> wrote:

> I have set up several Mythboxes before no problem. ( 32 bit and PVR
> 250's )
>
> This time, I have an athlon 64 ( FC5 X64 version ) and a PVR 500.
>
> I am getting no where with this setup so far ( any volunteers for
> assistance? )
> If I rmmod ivtv and modprobe ivtv then I can capture raw off /dev/video0
> and /dev/video1
> But then it seems to hang after a bit and I have to rmmod it.
>
> Should I just be going with the 32 bit OS?
>
> Some assistance to get past this would be appreciated. I have never run
> into this many issues in the past.

I have an Athlon64 and I gave up on 64-bit with FC2. I'm now running
FC4-32bit with no problem. Unfortunately, 64bit just isn't there yet,
especially on Fedora. It should be, though. What a great opportunity for
Linux to beat the pants off of Windows.

brad
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On Jun 23, 2006, at 6:16 PM, Mark wrote:

> I have set up several Mythboxes before no problem. ( 32 bit and PVR
> 250's )
>
> This time, I have an athlon 64 ( FC5 X64 version ) and a PVR 500.
>
> I am getting no where with this setup so far ( any volunteers for
> assistance? )
> If I rmmod ivtv and modprobe ivtv then I can capture raw off /dev/
> video0 and /dev/video1
> But then it seems to hang after a bit and I have to rmmod it.
>
> Should I just be going with the 32 bit OS?
>
> Some assistance to get past this would be appreciated. I have
> never run into this many issues in the past.

I once was running an Athlon64 with Gentoo in 64-bit mode. MythTV
built and ran fine using the standard Gentoo Ebuild, so I don't think
there is anything inherently not 64-bit clean in Myth, although some
ancillary stuff might have problems.

This was back with version 0.18.

I'm now running that hardware with a MythDora installation, which is
a 32-bit FC system, and as far as I can tell there is no advantage to
running Myth in 64-bit mode.

Certainly more folks are running 32-bit Myth systems, even those with
64-bit CPUs, and you;re usually better off running something more
common.

There are the usual problems with 64-bit Linux of course, the lack of
a 64-bit flash plugin/player being one, if you consider that a
problem :-) Also some "proprietary binary blob" type drivers are
either not available or lag behind their 32-bit cousins. You also
can't use the Windows codecs easily, as you can with 32-bit Linux.

But it ought to work.

On Fri, 2006-06-23 at 18:16 -0600, Mark wrote:

> This time, I have an athlon 64 ( FC5 X64 version ) and a PVR 500.

I have been running MythTV in a wintv-pvr-350 since SuSE 9.2 all in 64.
I have now amd fx-55 and SuSE 10.1.

With this new kernel the installation of ivtv changes a little bit. ivtv
0.6.3 has been the key in the installation. I could not compile 0.6.2.
SuSE 10.1 (box) is a pretty solid distro. I do not have experience with
others :-(
My suggestion would be to first test the ivtv module with mplayer. If OK
then the problem is with myth. I first load the ptune-ui and then
mplayer and I have a TV application. If you have problem with these
steps please e-mail me.

-=terry(Denver)=-



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On Fri, 23 Jun 2006 17:32:58 -0700, Brian Wood <beww@beww.org> wrote:

>
> On Jun 23, 2006, at 6:16 PM, Mark wrote:
>
>> I have set up several Mythboxes before no problem. ( 32 bit and PVR
>> 250's )
>>
>> This time, I have an athlon 64 ( FC5 X64 version ) and a PVR 500.
>>
>> I am getting no where with this setup so far ( any volunteers for
>> assistance? )
>> If I rmmod ivtv and modprobe ivtv then I can capture raw off /dev/
>> video0 and /dev/video1
>> But then it seems to hang after a bit and I have to rmmod it.
>>
>> Should I just be going with the 32 bit OS?
>>
>> Some assistance to get past this would be appreciated. I have
>> never run into this many issues in the past.
>
> I once was running an Athlon64 with Gentoo in 64-bit mode. MythTV
> built and ran fine using the standard Gentoo Ebuild, so I don't think
> there is anything inherently not 64-bit clean in Myth, although some
> ancillary stuff might have problems.
>
> This was back with version 0.18.
>
> I'm now running that hardware with a MythDora installation, which is
> a 32-bit FC system, and as far as I can tell there is no advantage to
> running Myth in 64-bit mode.
>
> Certainly more folks are running 32-bit Myth systems, even those with
> 64-bit CPUs, and you;re usually better off running something more
> common.
>
> There are the usual problems with 64-bit Linux of course, the lack of
> a 64-bit flash plugin/player being one, if you consider that a
> problem :-) Also some "proprietary binary blob" type drivers are
> either not available or lag behind their 32-bit cousins. You also
> can't use the Windows codecs easily, as you can with 32-bit Linux.
>
> But it ought to work.

When I started 64bit with FC2 a few of the myth components were not 64 bit.
But, what was really a problem was all the other stuff - as mentioned by
Brian here.


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--- Brad Fuller <bradallenfuller@yahoo.com> wrote:

> On Fri, 23 Jun 2006 17:32:58 -0700, Brian Wood <beww@beww.org> wrote:
>
> >
> > On Jun 23, 2006, at 6:16 PM, Mark wrote:
> >
> >> I have set up several Mythboxes before no problem. ( 32 bit and PVR
> >> 250's )
> >>
> >> This time, I have an athlon 64 ( FC5 X64 version ) and a PVR 500.
> >>
> >> I am getting no where with this setup so far ( any volunteers for
> >> assistance? )
> >> If I rmmod ivtv and modprobe ivtv then I can capture raw off /dev/
> >> video0 and /dev/video1


I'm running FC5 on an AMD64 system without any problems and I have both a
PVR150 and PVR500

David Novick
dknovick@yahoo.com

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On 6/23/06, Mark <list@onnow.net> wrote:
> Should I just be going with the 32 bit OS?
>
> Some assistance to get past this would be appreciated. I have never run
> into this many issues in the past.

I recently tried to help a friend get MythTV going on FC5-64bit on his
system, but we had a problem where the frontend and ivtv driver would
hang with live-tv channel changes. We ended up reinstalling with
FC5-32bit and that works fine now. Not sure if it's a Myth or ivtv
bug...

The rest seemed to work OK, but the new PVR500 has poor reception/lots
of static on /dev/video1 problem that has cropped up with the latest
PVR500s. /dev/video0 works perfectly.

There supposedly should be an updated ivtv driver to fix this soon
(maybe it's out already?), but as of a few weeks ago we had no luck
with it using any of the ivtv drivers available through ATrpms.

-Dave
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The strange thing is that I can:
mplayer -vo x11 on both dev/video0 and /dev/video1 with no problems.
Sometimes I have to rmmod ivtv and modprobe it back in though.

The problem seems to be in MythTV. It plays channel 2 then if I change
channel, it hangs and locks myth up.

Ideas?

Mark
----- Original Message -----
From: "David Rees" <drees76@gmail.com>
To: "Discussion about mythtv" <mythtv-users@mythtv.org>
Sent: Friday, June 23, 2006 6:55 PM
Subject: Re: [mythtv-users] Myth and 64 bit OK? Seeing too many issues


On 6/23/06, Mark <list@onnow.net> wrote:
> Should I just be going with the 32 bit OS?
>
> Some assistance to get past this would be appreciated. I have never run
> into this many issues in the past.

I recently tried to help a friend get MythTV going on FC5-64bit on his
system, but we had a problem where the frontend and ivtv driver would
hang with live-tv channel changes. We ended up reinstalling with
FC5-32bit and that works fine now. Not sure if it's a Myth or ivtv
bug...

The rest seemed to work OK, but the new PVR500 has poor reception/lots
of static on /dev/video1 problem that has cropped up with the latest
PVR500s. /dev/video0 works perfectly.

There supposedly should be an updated ivtv driver to fix this soon
(maybe it's out already?), but as of a few weeks ago we had no luck
with it using any of the ivtv drivers available through ATrpms.

-Dave
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1. TUNER SETUP:

Download the video frequencies:

http://prdownloads.sourceforge.net/ivtv/Video-Frequencies-0.03.tar.gz?download

Download the video
http://prdownloads.sourceforge.net/ivtv/Video-ivtv-0.13tar.gz?download

Download the config-ini files
http://search.cpan.org/CPAN/authors/id/W/WA/WADG/Config-IniFiles-2.38.tar.gz
need it to run ptune)

2. LOAD THE FIRMWARE

#depmod -ae
#modprobe ivtv

if you do not load the firmware when you try to install the perl modules
like Video-ivtv-0.13 it will complain that video0 does not exis ++++

3. DO THE INSTALLATIONS

Config-IniFiles-2.38
Video-Frequencies-0.03
Video-ivtv-0.13

in each new source directory do the following

# perl Makefile.PL
# make
# make test
# make install

Sometimes the make test will not find the file; its ok

3. TEST THE INSTALLATION.

Load tuner:

cd to the ~/mm/ivtv-0.6.3/utils/perl

$ perl ptune-ui.pl

now you should see the graphic tuner.

Load the tv application

$ mplayer /dev/video0

if you have problem droping frames or closing the application add some
cache like

$mplayer -cache 8192 /dev/video0

4. ETC

I did not include the installation of ivtv neither mplayer

In my system running SuSE 10.1 64 mythtv is working perfect. BTW I have
not had any problems with SuSE 64 in any place except in faad2 trying to
decode itunes.

Regards,

-=terry(Denver)=-






On Fri, 2006-06-23 at 18:38 -0600, Mark wrote:
> Thank you,
>
> How do I test ivtv with mplayer? cat /dev/video > file then view?
> That works if I rmmod ivtv and modprobe it back in. Then it seems to screw
> up again later.
>
> MArk
> ----- Original Message -----
> From: "Teruel de Campo MD" < >
> To: "Discussion about mythtv" <mythtv-users@mythtv.org>
> Sent: Friday, June 23, 2006 6:34 PM
> Subject: Re: [mythtv-users] Myth and 64 bit OK? Seeing too many issues
>
>
>
>
> On Fri, 2006-06-23 at 18:16 -0600, Mark wrote:
>
> > This time, I have an athlon 64 ( FC5 X64 version ) and a PVR 500.
>
> I have been running MythTV in a wintv-pvr-350 since SuSE 9.2 all in 64.
> I have now amd fx-55 and SuSE 10.1.
>
> With this new kernel the installation of ivtv changes a little bit. ivtv
> 0.6.3 has been the key in the installation. I could not compile 0.6.2.
> SuSE 10.1 (box) is a pretty solid distro. I do not have experience with
> others :-(
> My suggestion would be to first test the ivtv module with mplayer. If OK
> then the problem is with myth. I first load the ptune-ui and then
> mplayer and I have a TV application. If you have problem with these
> steps please e-mail me.
>
> -=terry(Denver)=-
>
>
>
> _______________________________________________
> mythtv-users mailing list
> mythtv-users@mythtv.org
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>
>

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Is there a performance diff on 32 vs 64 bit? Running on athlon 64 chip.


----- Original Message -----
From: "David Rees" <drees76@gmail.com>
To: "Discussion about mythtv" <mythtv-users@mythtv.org>
Sent: Friday, June 23, 2006 6:55 PM
Subject: Re: [mythtv-users] Myth and 64 bit OK? Seeing too many issues


On 6/23/06, Mark <list@onnow.net> wrote:
> Should I just be going with the 32 bit OS?
>
> Some assistance to get past this would be appreciated. I have never run
> into this many issues in the past.

I recently tried to help a friend get MythTV going on FC5-64bit on his
system, but we had a problem where the frontend and ivtv driver would
hang with live-tv channel changes. We ended up reinstalling with
FC5-32bit and that works fine now. Not sure if it's a Myth or ivtv
bug...

The rest seemed to work OK, but the new PVR500 has poor reception/lots
of static on /dev/video1 problem that has cropped up with the latest
PVR500s. /dev/video0 works perfectly.

There supposedly should be an updated ivtv driver to fix this soon
(maybe it's out already?), but as of a few weeks ago we had no luck
with it using any of the ivtv drivers available through ATrpms.

-Dave
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On Fri, 2006-06-23 at 19:02 -0600, Mark wrote:
> The strange thing is that I can:
> mplayer -vo x11 on both dev/video0 and /dev/video1 with no problems.
> Sometimes I have to rmmod ivtv and modprobe it back in though.
>
> The problem seems to be in MythTV. It plays channel 2 then if I change
> channel, it hangs and locks myth up.
Mark,

Install the tuner and play with the tuner and mplayer. At least you
eliminate a hardware problem and a module problem. With one of the old
ivtv modules I had a problem under myth with channels and spend many
days trying to figure out and finally I replace the ivtv for another
version and everything was ok.

-=terry(Denver)=-

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On Jun 23, 2006, at 7:04 PM, Mark wrote:

> Is there a performance diff on 32 vs 64 bit? Running on athlon 64
> chip.
>
>
> ----- Original Message -----
> From: "David Rees" <drees76@gmail.com>
> To: "Discussion about mythtv" <mythtv-users@mythtv.org>
> Sent: Friday, June 23, 2006 6:55 PM
> Subject: Re: [mythtv-users] Myth and 64 bit OK? Seeing too many issues
>
>
> On 6/23/06, Mark <list@onnow.net> wrote:
>> Should I just be going with the 32 bit OS?
>>

From what I have read there is no great benefit to running Myth in
64-bit mode.

Most of what Myth does is not floating-point intensive, or anything
that would seem to benefit from the 64-bit architecture. The basic
Myth just moves data around, except for the DB stuff, as most
processing is taking place on capture cards or video cards, unless
you're running frame-grabbers.

Some of the format conversions or maybe requant might benefit some,
but I suspect the difference would not be great.

One problem with codec-related things that seem as though they
*should* benefit from 64-bit is that they don't, because the 32-bit
versions have been optimized so well, while similar work has not
(yet?) taken place with the 64-bit code.




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Brad Fuller wrote:
> I have an Athlon64 and I gave up on 64-bit with FC2. I'm now running
> FC4-32bit with no problem. Unfortunately, 64bit just isn't there yet,
> especially on Fedora. It should be, though. What a great opportunity for
> Linux to beat the pants off of Windows.

My FC4 runs very well on an Athlon64. I run MythTV from SVN and update
every few weeks, depending on the recent commits and likelihood of breakage.

The only problems I've had, specifically with x86_64, is with Java and
Flash on Firefox. But these problems don't affect Myth functionality.

--
Graeme Hilton
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On Jun 24, 2006, at 4:02 AM, Graeme Hilton wrote:

> Brad Fuller wrote:
>> I have an Athlon64 and I gave up on 64-bit with FC2. I'm now running
>> FC4-32bit with no problem. Unfortunately, 64bit just isn't there yet,
>> especially on Fedora. It should be, though. What a great
>> opportunity for
>> Linux to beat the pants off of Windows.
>
> My FC4 runs very well on an Athlon64. I run MythTV from SVN and
> update
> every few weeks, depending on the recent commits and likelihood of
> breakage.
>
> The only problems I've had, specifically with x86_64, is with Java and
> Flash on Firefox. But these problems don't affect Myth functionality.

Sorry to be a bit OT:

I was able to get the Blackdown 32-bit java emulation to work on my
amd64 system. As for Flash I can run the 32-bit binary version of
Firefox if I need Flash to work (rare).

Not true 64-bit solutions, but they do work transparently to the user.

This is on a Gentoo box, don't know anything about FC4,
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On Fri, 23 Jun 2006 17:26:35 -0700, Brad Fuller wrote:
> I have an Athlon64 and I gave up on 64-bit with FC2. I'm now running
> FC4-32bit with no problem. Unfortunately, 64bit just isn't there yet,
> especially on Fedora. It should be, though. What a great opportunity for
> Linux to beat the pants off of Windows.

This is quite simply not true. Sure FC2 was a bit hit and miss on 64 bit
but that's years ago now. FC3 was fine and any remaining issues were gone
before FC4.

All my machines are 64 bit, now FC5, and I haven't seen a 64 bit related
issue for over a year. Myth runs in 64 bit fine (and has done ever since
0.17) and it's been mentioned on this list several times that Isaac
develops mythtv on a 64 bit machine.

As to speed improvement it depends on your application, but almost
everything runs faster in 64 bit. This is because the old 32 bit
architecture is very low on processor registers, which makes it harder
for the compiler to produce good code. When running in 64 bit the number
of registers of each type is doubled, which helps the compiler produce
efficient code. That alone is typically worth 5% or more.

Cheers,

Martin.

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On 6/24/06, Martin Ebourne <lists@ebourne.me.uk> wrote:
>
> On Fri, 23 Jun 2006 17:26:35 -0700, Brad Fuller wrote:
> > I have an Athlon64 and I gave up on 64-bit with FC2. I'm now running
> > FC4-32bit with no problem. Unfortunately, 64bit just isn't there yet,
> > especially on Fedora. It should be, though. What a great opportunity for
> > Linux to beat the pants off of Windows.


I'm running FC5 x86_64. Granted it's only a frontend but I haven't seen any
instability issues so far. It's acutally much more stable then my backend.

Mark wrote:
> I have set up several Mythboxes before no problem. ( 32 bit and PVR 250's )
>
> This time, I have an athlon 64 ( FC5 X64 version ) and a PVR 500.
>
> I am getting no where with this setup so far ( any volunteers for assistance? )
> If I rmmod ivtv and modprobe ivtv then I can capture raw off /dev/video0 and /dev/video1
> But then it seems to hang after a bit and I have to rmmod it.
>
> Should I just be going with the 32 bit OS?
>



I cant help with the FC5_X64, but I cant help but ask why.

If the 32 bit system works, use it. Unless, of course, you
expect some serious performance improvement or feature
enhancement using FC5_X64.

My mythtv system works very well. The backend is on an
Athlon +1800 and the front end is on a P-III. Frontend runs
Knoppmyth. Backend runs FC4 with Myth-Suite binaries from
ATrpms. Only one capture card but the backend could support
several more if needed.

After spending quite a bit of time getting all that to work
like I want, I would rather play with the working system
than get involved in developing a new system on FC5.

I dont see anything that FC5 does, that FC4 cant do as well.
At least as far as mythtv is concerned.

Regards,
Frank Kamp
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I replaced my SBE/workstation with a HP m7248 multimedia pc Athalon 4200 X2
and installed FC5 x86_64. I only had two issues.

1. The m7284 came with a Yaun PVR-550 tuner and I installed the Hauppauge
pvr-150 that I had in the old SBE. Mythfrontend would always crash when
switching between the two tuners. I did not have a problem with both tuners
when accessed from a remote front end. This issue was fixed by switching to
the fglrx ati graphics driver from the livna repository.

2. ivtv 6.2 drivers would time out when I tried to change channels on either
pvr-550 or the pvr-150. I downgraded to ivtv 6.1 from the sources kit, now
that problem is gone.

I never ran any older versions of Fedora Core on this box FC5 is all I ever
tried.

Now since its a workstation and a SBE I do not drive a TV with the ati
graphics card. I run mythfrontend in a window. I also can not speak for how
well Mysqld would or would not work on a FC5 X86_64 install, as a SBE mysqld
is not running.

All in all I am pretty happy with it.
Alan Anderson

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On 6/23/06, Mark <list@onnow.net> wrote:
>
> Is there a performance diff on 32 vs 64 bit? Running on athlon 64 chip.


You guys have given theoretical answers to this question but no one has
given any proof. Well, I've got some proof that running 64bit isn't
faster. I have a FE/BE machine that does everything, AMD 939pin 3200+, w/
1GB ram and SATA disks. I set it up about a year and a half ago on 32bit
Debian (after a short attempt at 64bit that wasn't successful). I've been
running the 32bit Debian with CVS (and then SVN) myth since then, updating
myth every couple weeks and upgrading all Debian packages once a month,
kernel every few months.
I watch OTA DVB transmissions in SD and HD on this machine. My benchmark
is watching a stream in 1080i with deinterlacing on. Last week I had an
issue with ReiserFS on RAID1 that caused me to lose my setup (whole other
story, I now run ext3). Since I was forced to rebuild, I figured I'd try
64bit again. I rebuilt it this weekend and this time it went smooth
(running Etch). Now that I have everything running like it was, I've found
my CPU usage on my benchmark is almost out of range. These are the results:

AMD 3200+ on 32bit Debian using 32bit NVIDIA 8762 @ 1920x1080 /w deint - 60%
to 80% cpu usage (depending on program)
AMD 3200+ on 64bit Debian using 64bit NVIDIA 8762 @ 1920x1080 /w deint -
90%+ cpu usage (not too much usage yet)

Over the next month or so, I plan on installing a chroot of 32bit Debian
on top of my 64bit system so I can run 32bit X with 32bit NVIDIA. I'm not
sure it's even possible at this time but I want to see if I can regain my
60-80% and it'll give me a much better comparison between 32bit and 64bit
setups for several functions.

-Greg

On 6/23/06, Mark <list@onnow.net> wrote:
>
>
> I have set up several Mythboxes before no problem. ( 32 bit and PVR 250's )
>
> This time, I have an athlon 64 ( FC5 X64 version ) and a PVR 500.
>
> I am getting no where with this setup so far ( any volunteers for
> assistance? )
> If I rmmod ivtv and modprobe ivtv then I can capture raw off /dev/video0 and
> /dev/video1
> But then it seems to hang after a bit and I have to rmmod it.
>
> Should I just be going with the 32 bit OS?
>
> Some assistance to get past this would be appreciated. I have never run
> into this many issues in the past.
>

I've been running a 64bit backend on FC4 for about a year, Jun 17th
2005 according to the timestamp of my /etc/issue. I have a PVR250 and
a PVR150 running 2.6.16 and it's been a solid platform for me. Are
you using the ATRPM IVTV drivers?

The CPU is a Athlon 64/3000 S754 on a SiS Motherboard. Have you tried
the PVR500 on windows to see if it's not a card issue?

good luck,

Yan
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On 6/25/06, Greg Grotsky <spikeygg@gmail.com> wrote:
>
> AMD 3200+ on 32bit Debian using 32bit NVIDIA 8762 @ 1920x1080 /w deint -
> 60% to 80% cpu usage (depending on program)
> AMD 3200+ on 64bit Debian using 64bit NVIDIA 8762 @ 1920x1080 /w deint -
> 90%+ cpu usage (not too much usage yet)
>

I just wanted to follow this email up, because I just found out that I still
had the default AGPGART loaded into the kernel. I just removed it and now
the NVIDIA driver is using NvAGP (like it should be) and I now get my 65%
cpu usage! YAY! The moral of the story is, if you have an NVIDIA card,
DON'T USE KERNEL SUPPLIED AGPGART!

-Greg

On Jun 29, 2006, at 9:20 PM, Greg Grotsky wrote:

> On 6/25/06, Greg Grotsky <spikeygg@gmail.com> wrote:
> AMD 3200+ on 32bit Debian using 32bit NVIDIA 8762 @ 1920x1080 /w
> deint - 60% to 80% cpu usage (depending on program)
> AMD 3200+ on 64bit Debian using 64bit NVIDIA 8762 @ 1920x1080 /w
> deint - 90%+ cpu usage (not too much usage yet)
>
> I just wanted to follow this email up, because I just found out
> that I still had the default AGPGART loaded into the kernel. I
> just removed it and now the NVIDIA driver is using NvAGP (like it
> should be) and I now get my 65% cpu usage! YAY! The moral of the
> story is, if you have an NVIDIA card, DON'T USE KERNEL SUPPLIED
> AGPGART!
>

Perhaps true in your case, but I thought it was usually a matter of
what chipset on your motherboard was providing the AGP interface.

The nVidia README says that some chipsets are not supported by their
driver, I believe they list the supported ones.

I guess the best solution is to try both AGP drivers to see which
gives the best result.

Also, in most cases you will have to re-compile your kernel in order
to use NvAGP, not a problem but something to be aware of.