thanks for sharing these infos. I am relativly sure that i encounted a crash near munich a few weeks ago ON WINDOWS7! I tried a flight from EDDF to EDDM three times, always with a CTD near munich. Don’t know it its related, but may be (Window7, 64bit, GeForce 560 TI)

I don’t know what’s optimal, but default does appear to work okay. I didn’t find anything that made things hugely better.

any recommendations for the NVIDIA driver settings ? Or should the be left on default ?

Hrm – maybe the same bug then…let me see if I can repro it on my linux box.

Re 580: On the i7/Triple-580GTX/Win7-64 box I have tried, X-Plane 10 is not playable at all, even at minimum detail settings, FPS is around 30 with minimum settings. Increasing detail level decreases FPS but not dramatically. I have tried enabling and disabling SLI from the control panel and there is a ~3x difference in FPS (without SLI, single screen only, is better), using the same (small) window size. I think there is a strange compatibility issue, and I think that it’s because both XP10 _and_ the Nvidia drivers have some bugs that together cause this. My plan is to try installing Linux on this box to see if it works better. Feel free to contact me through e-mail and we can debug this issue together. I don’t know if you have access to a huge triple-GPU SLI setup, so I can help you on that front.

Re glMapBuffers: I don’t know about the driver in question and this use case in particular. On the GL(ES) driver I work on, I’ve noticed that sticking to simple use cases if usually the fastest path. Exploring the dark corners of GL (like texture completeness oddities) will often trigger a nasty software workaround, which may be slow and/or buggy.

Re math bug: Playing around with different compiler versions and optimization flags is laboursome but may reveal nasty bugs, but you have to be able to reliably reproduce the problem to get anything meaningful. Depending on the subset of C or C++ you’re using, changing from GCC to Clang may be anything from trivial to impossible. Clang is intended to be GCC compatible, but all (C++) features are not quite ready yet.

Just tried it on 64-bit Arch Linux, AMD 6950. Over KPDX with no clouds and cars set to “Siberian” the framerate is about 25 fps. Changing cars to “none” the framerate immediately goes up to 45 fps. I don’t know if it’s related to the Windows bug but cars really impact the fps in Linux on my machine.

Thanks for the updates Ben – I enjoy reading the posts that you and Chris post.

Hi,

I have a 580 and i7 920 non-overclocked with 6gb of ram and running Win 7 64 bit.

How can I help?

Cheers
Mark

If you want I send you my email again with the crashlog.