Choppy Preformance with Wirless Adapter

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tris2n
Settler

Re: Choppy Preformance with Wirless Adapter

I spoke too soon!

 

I am still seeing high CPU utlisation with the CPU i5 7600K running on Windows 10, 32GB memory, Nvidia GTX1080, latest BIOS and non-beta SteamVR.

 

I have even tried dialling down the resolution to 160% - SteamVR recommands 200% for my CPU/GPU.

 

@Synthesis any further thoughts on what else I can do?

 

One is at 180% and one is at 160% (time of capture makes it look a bit better than it actually is).110119 Capture - Golf Club VR with smooth motion and 180%.JPG

110119 Capture - Golf Club VR with smooth motion and 160%.JPG

Saint666
Explorer

Re: Choppy Preformance with Wirless Adapter

@tris2n Try starting with setting both supersampling values to 100%. And see the CPU load together in fpsVR and windows task manager (they show different values). Gradually increase the global resolution setting in steps of 10%. The algorithm for automatic set of supersampling by 200%, depending on the video card model, is unknown to us. Start with 100% and increase until the frame rendering time is less than 9 ms.

tris2n
Settler

Re: Choppy Preformance with Wirless Adapter

You are right @Saint666 there is roughly a 20% difference between what fpsVR show and what windows task manager shows, with task manager being the higher. For clarity, all of my CPU percentages below are from windows task manager. All of my frame rendering times are from fpsVR.

 

I started doing what you said and there was only a small jump in frame timing improvement between running at 50, 100, 150, 200 and even 300% resolution. My next thought is this has to be CPU bound.

 

I shutdown as many tasks as possible, chrome browser, items in the quick bar, etc. even the Advanced Frame Timing tool in the SteamVR settings, which I noticed uses roughly 15% CPU. That reduced my general CPU usage with SteamVR running to around 70% before running a game (it is usally 80-85%).

 

Then I started my reference game and slowly increased the resolution from 50% up to 300%. The CPU always stayed below 100%, and the CPU refresh rate well below 9ms, even when I was at 300% resolution! It was only really the GPU that went up each time and even that only went above 9ms (to 12ms) when I was at 300% resolution.

 

So for me anyway, this is most definitely a CPU bound issue, regardless of the resolution. In otherwords if I hit 100% CPU, even for a short time it will result in poor performance, which I guess is what you'd expect. 

 

I think the only way this can be resolved is for Steam / HTC / whoever to improve the efficiency of SteamVR, which currently stands at 40%+ CPU on my fairly decent system, and the Compositor, which stands at 35%+ CPU, which is collectively between 75-80% CPU and that is before running a game, which will take upwards of 10-20%.

 

Until they improve those two items I will need to play with quite a lot of things shut down or build an even more expensive CPU beast (mine was pretty expensive as it is).

Saint666
Explorer

Re: Choppy Preformance with Wirless Adapter

@tris2n But how does the system behave when connecting the helmet with a wire? What processor load and what processes on the reference super-sampling value are 100%? you need to understand the difference in the load on the processor between the wired and wireless connection

tris2n
Settler

Re: Choppy Preformance with Wirless Adapter

@Saint666 I'd assumed there is a difference purely because I had absolutely no stuttering /  choppy performances using wired, which I had used for nearly two years. I agree though, that's the only way to know for sure so I'll do some measurements but it'll probably be in a week's time when I have more free time. I'll post back once I have them.

 

Even if I get similar measurements, i.e. Wired = Wireless then the Wireless may not be at fault, at least for me, but Vive's CPU working specs are clearly wrong as I am well within their specification.

Saint666
Explorer

Re: Choppy Preformance with Wirless Adapter

@tris2n I think the guys from VIVE were very modest in describing the minimum requirements for a wireless adapter Smiley Happy A computer for VR should have sufficiently high characteristics. Couldn't they say, “hey guys, we released a cool product, but you still have to improve your processors” Smiley Happy

EjGarfield
New Arrival

Re: Choppy Preformance with Wirless Adapter

I am also having this issue withan i7-1930 @@3.4GH 3.70 GHz, 64 GMB RAM, 64 bit. i feel like this should just be plug and play...

sking06
New Arrival

Re: Choppy Preformance with Wirless Adapter

I will readily admit that I am at the bottom of the knowledge totam pole with regards to this issue, but it turns out that the solution for me was to remove the second of my $850 RTX2080 video cards..... a very bitter sweet solution.

Jason
Contributor

Re: Choppy Preformance with Wirless Adapter

Im another victim here Smiley Sad.
I have a 2500k i5 1070ftw
Wired it runs butter smooth even with high ss, wireless kills performance too much, cant play dirt rally now (vive) all is blocky, if this is corrected a vive version 6 might be out.
Waste of my cash.......
I will disconnect wireless and go back to cables.... no options available ....
beshkenadze
Settler

Re: Choppy Preformance with Wirless Adapter

2-gen Intel processor should be changed to something more modern Smiley Happy

Zacware
Explorer

Re: Choppy Preformance with Wirless Adapter

As someone wth a high end PC and a Vive Pro that is unusable with Vive Wireless due to jitter, I would appreciate it if Vive Support could at least give some examples of PC configs that we’re used for testing at Vive that are known to be good. At least that would help some of us determine what the cause might be.

 

Vive Pro

Clean Windows 10 Install

MSI Carbon AC Z370

Intel i7 8700

GTX 1080Ti

Corsair 3200 MHZ Ram

 

AlteredRealitiesVRArcade
Explorer

Re: Choppy Preformance with Wirless Adapter

Feel free to shoot full of holes as I'm using observational references at this time.

 

I have an i7-7700K with 32GB RAM and have intermittent grey-outs while playing. I've been able to mitigate these by turning off my antivirus and firewall (both Microsoft Windows 10 default products). When I DO have grey outs the issue appears as a disconnect in SteamVR, not an issue with the general OS function or GPU function. My pet theory is the Intel WiGig pushes the CPU so hard any break in the timing, like the AV updating or scanning (priority issue?) will cause SteamVR to read that as an interruption of connection to the headset and disconnect temporarily. I really really wish Intel had made this thing work through a discrete GPU or at least allow us to offload the process to the built-in GPU on the CPU.

 

It's probably made worse by recent OS 'fixes' and new Intel microcode that mitigate the Spectre vulnerabilities discovered last year. Those fixes trash some performance use cases on Intel processors, and won't be re-worked into a less performance-trashy form in Windows 10 until March (or whenever it ended up getting pushed out till).

 

I'm going to try the wireless out on an i7-8700K next week and see if there's better performance for me.

snackdaddy185
Explorer

Re: Choppy Preformance with Wirless Adapter

Are most of these issues more common on the regular vive (not pro)? I've had 3 different pc configurations so far and all have been working well on the original vive. I have an opportunity to get a vive pro but would hate to get it if my setup doesnt work.