Hi, For the 7900 card, the driver version that fixed the slow down was 83.91.
For the 8800 GTX card, I have not been able to find a driver version to fix it. However, after hearing that it happened on another dual core machine, I was able to find others with the problem. It appears that it is an Nvidia bug. There are a couple of possible solutions. In the Nvidia control panel you may have a setting called Threaded Optimization. One of our computers has that setting available, but for some reason it doesn't appear on another. If you do have that setting, turning it off appears to fix the problem. If you don't have the setting, you can still turn it on or off in the registry. The path to the value is HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Video\[your GUID here]\0000 if you have the value OGL_ThreadControl, set it to DWORD:00000002. If you don't have it, you can add it. I did this on my dual core machine and that seemed to fix the problem. This setting apparently controls the driver threading, and there are a number of people that have reported the problem on dual core machines. This site: http://forums.nvidia.com/lofiversion/index.php?t9875.html has some information about the problem. I hope this works for you, let me know how it turns out. Good luck, Will On Nov 12, 2007 10:59 PM, Akhtar Shamim <[EMAIL PROTECTED]> wrote: > Thanks very much Charles and Will for your support. Very much appreciated. > > Best regards, Shamim > > > > On Nov 13, 2007 12:52 AM, Will Dicharry <[EMAIL PROTECTED] > wrote: > > I don't have access to the machine that I was able to fix it on right > > now, so I don't know the exact version of the drivers. For the 7900 > > card, all I had to do was install the vendor drivers that came with > > the card. I believe the vendor on that one was EVGA. I will be able > > to check the version tomorrow. > > > > I've had the problem on two 8800 GTX cards, one an Asus, the other an > > Evga. I have not been able to fix it on the Evga card yet. On the > > Asus card, there is an option in the Nvidia control panel under the 3d > > settings about threading that doesn't appear on the Evga machine. I > > have no idea why that is. That option fixed the problem on the Asus > > card. I will be able to check the exact name and setting of that > > option tomorrow. > > > > I will send another email tomorrow after I check the driver version > > and the extra setting to give you more information. > > > > Will > > > > > > > > > > On Nov 11, 2007 7:36 PM, Akhtar Shamim <[EMAIL PROTECTED]> wrote: > > > Hi Will, > > > > > > Is it possible for you to link me to the driver which solves the > problem? > > > That will be very helpful to me. > > > > > > Regards, Shamim > > > > > > > > > > > > On Nov 12, 2007 9:02 AM, Akhtar Shamim < [EMAIL PROTECTED]> wrote: > > > > Thanks for your replies. Robert, I am using windows XP Pro with > service > > > pack 2. The problem happens with GeForce 8800 GTX cards. > > > > > > > > Will, is there any solution to this or do I need to change my graphics > > > cards? > > > > > > > > Regards, Shamim > > > > > > > > > > > > > > > > > > > > > > > > On Nov 12, 2007 5:53 AM, Will Dicharry <[EMAIL PROTECTED] > wrote: > > > > > > > > > Hi, I am not sure if this is the same problem, but I have an > > > > > application that uses large paged databases and have seen a slow > down > > > > > on a higher end machine with a GeForce 7900 The slow down was only > on > > > > > Windows, Linux ran fine. After tracking it down, I found out that > the > > > > > bottleneck was actually in the graphics drivers. After installing > an > > > > > older version of the drivers, the performance went back up again. > > > > > I've also seen the same behavior on a machine with a GeForce 8800 > GTX. > > > > > Unfortunately, I cannot find an older version of the drivers for > that > > > > > card. Again, I don't know if this is the same problem, but the > > > > > performance loss on a higher end machine rang a bell in my head. > > > > > > > > > > Will > > > > > > > > > > > > > > > > > > > > > > > > > On Nov 10, 2007 12:31 AM, Akhtar Shamim < [EMAIL PROTECTED]> wrote: > > > > > > Dear All, > > > > > > > > > > > > Lately I had been seeing a very obscure problem with our OSG > > > application. > > > > > > > > > > > > The application uses a very large Terra Vista paged terrain. I see > the > > > > > > following two phenomena: > > > > > > > > > > > > 1. With all our old computers ( i.e. computers having a single > core > > > CPU, 1 GB > > > > > > or less RAM and with graphics card < NVidia 6600) the application > > > gives a > > > > > > constant update rate of 60 Hz. No problem with any refresh rate > > > issues. > > > > > > > > > > > > 2. However, when I try the same application on a high end machine > > > (Dual Core > > > > > > CPU or Quad Core CPU and with graphics card 7800 GT++) the > performance > > > is > > > > > > very poor and quite unpredictable. I looked at the CPU usages and > > > found that > > > > > > the CPU usage is below 20 % for most of the CPUs. The application > > > crawls at > > > > > > less than 6-7 Hz. However, if I change the BIOS setting to use > only > > > one CPU > > > > > > the application is back to normal and runs at constant 60 Hz. > > > > > > > > > > > > It seems to me that the database pager isnt working perfectly with > > > multiple > > > > > > CPUs and gets deadlocked. I am very confused with this situation. > For > > > our > > > > > > deployment we have all new machines with dual and quad core CPUs > and > > > latest > > > > > > graphics cards. > > > > > > > > > > > > I would be very happy to hear suggestion/advice on how to solve > this > > > > > > performance issue. To be honest I am quite stuck with the problem. > I > > > have > > > > > > tried compiling our application with OSG 1.2 and OSG 2.0. The > > > phenomenon is > > > > > > the same. > > > > > > > > > > > > Best regards. > > > > > > > > > > > > > > > > > > > > > > > > > > > _______________________________________________ > > > > > > osg-users mailing list > > > > > > osg-users@lists.openscenegraph.org > > > > > > > > > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > > > > > > > > > > > > > > > _______________________________________________ > > > > > osg-users mailing list > > > > > osg-users@lists.openscenegraph.org > > > > > > > > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > > > > > > > > > > > > > > > > > > > > _______________________________________________ > > > > > > > > > osg-users mailing list > > > osg-users@lists.openscenegraph.org > > > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > > > > > > _______________________________________________ > > osg-users mailing list > > osg-users@lists.openscenegraph.org > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > >
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