Anyone else get inconsistent performance?

[Stephen7853]

No idea how to troubleshoot this, so I thought I'd ask here.
SteamVR Home is unplayable unless I restart my computer, I don't have it on by default but most of the time it just runs at like 10 fps, other times perfectly fine.

It seems a lot more common than it used to be, just now with H3VR, at 90hz and 95% resolution on my i5 4670 and GTX 970, I was getting constant reprojection. I restarted SteamVR twice, didn't do anything else, and now it's running fine. Same resolution, same refresh rate.

Here's a picture of my frame timings before and after restarting SteamVR. I'm not too sure how to read this to get any useful information. All the CPU spikes in the top one are from head movement
https://i.imgur.com/o4rj9x6.png

[BOLL]

Is this with an Oculus headset and while wearing the device? I'm asking because the rendering rate will, since a few updates back, go down to 10 Hz when the headset is idle.

[Stephen7853]

Publicado originalmente por BOLL:

Is this with an Oculus headset and while wearing the device? I'm asking because the rendering rate will, since a few updates back, go down to 10 Hz when the headset is idle.

It's an index, and not idling as far as I know. I think it's just stuck reprojecting, so 45hz in this case

[BOLL]

If it was precisely 10 fps it sounded like the idle Hz Valve implemented for the Oculus headset, but reprojecting to half of the headset Hz is more common.

This happens when the machine takes a longer time to render the frame than what it has available for a full frame-rate, which is what you're seeing in the frame-timing shots you provided.

I would check CPU and GPU usage numbers and temps when this happens, to see if there's a bottle-neck somewhere, or thermal throttling.

[Stephen7853]

Publicado originalmente por BOLL:

If it was precisely 10 fps it sounded like the idle Hz Valve implemented for the Oculus headset, but reprojecting to half of the headset Hz is more common.

This happens when the machine takes a longer time to render the frame than what it has available for a full frame-rate, which is what you're seeing in the frame-timing shots you provided.

I would check CPU and GPU usage numbers and temps when this happens, to see if there's a bottle-neck somewhere, or thermal throttling.

I mean that's the thing, it's reprojecting when it shouldn't be, unrelated to a hardware bottleneck because restarting SteamVR, without changing any settings, is enough to fix it.

I'll have to check the GPU and CPU usage next time this happens (I don't know how to replicate the issue) and compare, but judging by the frame timing graph, I imagine it'd be lower than what it should be

Edit: I tested SteamVR Home since it pretty much has bad performance all the time unless I restart my PC, I'm 99% sure a SteamVR update broke it cause it used to run fine.
I took a picture with the CPU and GPU usage here, both are actually at 100%
Frame timing's at 172 of 11.1 ms, I've had this scene perform just fine at 90hz and 100% resolution before. Frame timing drops to like 17-19ms at 20% resolution, so it's still reprojecting
https://i.imgur.com/Ig3DOR1.png
All applications in my settings are running with global resolution settings, so nothing's rendering higher than it should
Edit 2:
This time I didn't restart my PC, I reinstalled graphics drivers and my SteamVR Home frame timing dropped from 172ms to 8ms, eliminating reprojection. Whatever the cause is, I'll have to create a system report and submit it to steam support next time it happens

[BOLL]

Did you recently move your PC? If you had dry thermal paste it could crack/deteriorate and leave it undercooled. As your performance is taking a dump I would check temperatures and if there's thermal throttling. I use OpenHardwareMonitor[openhardwaremonitor.org] for that.

[Stephen7853]

Publicado originalmente por BOLL:

Did you recently move your PC? If you had dry thermal paste it could crack/deteriorate and leave it undercooled. As your performance is taking a dump I would check temperatures and if there's thermal throttling. I use OpenHardwareMonitor[openhardwaremonitor.org] for that.

No I haven't moved my PC in a long while, I installed the intel extreme tuning utility, I'll check for thermal throttling as soon as my frame times drop again.
Since my last post they went back up to 120ms, so I sent a ticket to steam support and then installed the intel utility, restarted PC to complete installation, frame times back to 8. Very strange

Edit:
103ms in SteamVR Home and the intel utility says there's no thermal throttling

[Poison Dart Frag]

Could it be some app running in the background? Maybe something that fires up after you don't move the mouse nor press an key for too long?

[Stephen7853]

Publicado originalmente por Poison Dart Frag:

Could it be some app running in the background? Maybe something that fires up after you don't move the mouse nor press an key for too long?

No, I think it has to do with my GPU not doing what it's supposed to. I dunno why or what would cause it, but steam support recommended I completely reinstall my drivers with DDU, so I'll try that out over the weekend.

Since my last post I did find a way to get around this issue without having to restart SteamVR, just lowering the resolution to the point where it stops reprojecting, then raising it back up to 100%.

Edit: Uninstalling and reinstall drivers didn't work, it is a mystery. I think steam support is out of ideas as well