Nealius Posted March 31 Posted March 31 I'm having terrible performance issues in the Mudhen, specifically around Bagram, that's not an issue in any other module--including the notoriously unoptimized Chinook. I get constant stutters and freezes around Bagram in one of my missions. Looking left/right during startup checks, taxiing, even once airborn and screaming down the runway I get stutters and 1~2 second freezes. Doing a tactical overhead at 3,000ft AGL, I get a 1 second freeze as soon as I get into the break turn, and constant stutters as I look left to check my downwind spacing. Base, final, and touchdown are smooth but after touchdown and towards the end of my rollout, massive stutters and 1-second pauses continuing for the duration of my taxi back to parking and shut down. Even once shut down and in F2 view positioned way out away from my jet, massive frame time spikes and stutters despite locked 72fps in my VR headset. If I fly the same mission in the Viper, Warthog, Apache, or Chinook, it's smooth as butter with no stutters at all. Only the Mudhen is affected.
VR Flight Guy in PJ Pants Posted March 31 Posted March 31 Any details to share? I Fly, Therefore I Am. One cannot go around not saying "Thank you" every time these days, can't you? YouTube: https://www.youtube.com/channel/UCc9BDi-STaqgWsjNiHbW0fA
Nealius Posted March 31 Author Posted March 31 Ah, forgot my specs: 7800X3D, 4070Ti Super (16GB), 64GB DDR5, all SSDs. DCS graphics settings are medium-low.
draconus Posted March 31 Posted March 31 Check if you hit VRAM or RAM limits in this case. Win10 i7-10700KF 32GB RTX4070S Quest 3 T16000M VPC CDT-VMAX TFRP FC3 F-14A/B F-15E CA SC NTTR PG Syria
Nealius Posted March 31 Author Posted March 31 (edited) At first glance everything looked fine other than occasional GPU usage dips that always coincided with ethernet usage spikes. RAM around 40GB, VRAM 14GB. GPU usage in the 80s, CPU usage in the 30-40 range. Then I took a look at my CPU cores and noticed four of them were maxed at 100%. When I looked at application affinity DCS was set to only run on four cores and I don't know why. I enabled all cores and the stutters disappeared. Other than how/why I had so many disabled cores, why would this only affect the Mudhen and not any of the other modules? At any rate, problem solved for now. I would have never thought to look at my core usage because I never messed with the affinity that I can recall. Edited March 31 by Nealius
BJ55 Posted March 31 Posted March 31 I don't have the F-15 anymore but... If it sets it's own affinity for the systems/radar, like the F-4 does, then disabling cores could cause performance issues. With my "inferior" PC I've had stutters at Bagram from day one with every aircraft (50%RAM 30%CPU and 70%GPU usage, after landing GPU goes to 100% usage), since also the F-15 is resources demanding... 2 I7-12700F, 64GB DDR4 XMP1 3000MHz, Asus Z670M, MSI RTX 3070 2560x1440 60Hz, TIR 5, TM WH VPC base, TM rudder, Win10 Pro
Tenkom Posted March 31 Posted March 31 2 hours ago, draconus said: Check if you hit VRAM or RAM limits in this case. How do you know if you have VRAM issues? It seems to use up all my VRAM(16GB) most of the time but I still have good performance, most of the time. Sometimes it just tanks for no apparent reason but that's been the case in DCS for me throughout DCS history and all my pcs.
Mr_sukebe Posted March 31 Posted March 31 Open the FPS counter in DCS (twice) to bring up the more detailed version. In the last row but one, it now states how much is USED and how much is RESERVED. 7800x3d, 5080, 64GB, PCIE5 SSD - Oculus Pro - Moza (AB9), Virpil (Alpha, CM3, CM1 and CM2), WW (TOP and CP), TM (MFDs, Pendular Rudder), Tek Creations (F18 panel), Total Controls (Apache MFD), Jetseat
draconus Posted March 31 Posted March 31 28 minutes ago, Tenkom said: How do you know if you have VRAM issues? There are plenty of apps, most are free (ex. gpu-Z) but also built-in windows task manager has RAM and GPU tabs if you keep it running in background. @Nealius Check the DCS special options tab for F-15E. You can try different CPU core settings for radar calculations. Win10 i7-10700KF 32GB RTX4070S Quest 3 T16000M VPC CDT-VMAX TFRP FC3 F-14A/B F-15E CA SC NTTR PG Syria
Nealius Posted March 31 Author Posted March 31 1 hour ago, BJ55 said: If it sets it's own affinity for the systems/radar, like the F-4 does, then disabling cores could cause performance issues. That could be it. I haven't had performance issues with the F-4, but I also haven't tried it in the same mission as I had the Mudhen issues in.
Tenkom Posted April 1 Posted April 1 17 hours ago, Mr_sukebe said: Open the FPS counter in DCS (twice) to bring up the more detailed version. In the last row but one, it now states how much is USED and how much is RESERVED. I was looking at this last night. I was playing with a steady fps. Used and reserved hovered around 14,5GB. They were usually very close. Sometimes USED was higher than Reserved. Does this game really require 16GB minimum of VRAM? Or is it a case of the game just grabbing whatever it can get it hands on? Anecdotally I also have a 4070super GPU with 12GB and it actually gives me higher FPS than my 6900XT but it's a stutter fest so I cannot use it. I guess this does indicate that 16GB is indeed required(for 4k high setting at least). Makes me happy about choosing the 6900xt over the 3080ti back in the day.
Nealius Posted April 1 Author Posted April 1 14.5GB in VR sounds about right I think. I had about 10GB in 2D with the same settings on the same mission. That said I do use optimized textures via the method here, which I think has reduced some of my VRAM usage. 1
draconus Posted April 1 Posted April 1 (edited) 17 minutes ago, Tenkom said: Does this game really require 16GB minimum of VRAM? Or is it a case of the game just grabbing whatever it can get it hands on? The game will use whatever amount of RAM and VRAM it needs when available. When VRAM is full the rest is going to RAM and the cleaning/data moving process can affect performance. When RAM is full the rest goes to the disk page file and yet again cleaning/data moving process will affect performance even more. When there's no room on the page file it will crash. Current DCS reqs: Minimum system requirements (LOW graphics settings): OS 64-bit Windows 10; DirectX11; CPU: Intel Core i3 at 2.8 GHz or AMD FX; RAM: 16 GB; Free hard disk space: 200 GB; Discrete video card NVIDIA/AMD 6GB; requires internet activation. Recommended system requirements (HIGH graphics settings): OS 64-bit Windows 10/11; DirectX11; CPU: Core i5+ at 3+ GHz or AMD FX / Ryzen; RAM: 32 GB ; Free hard disk space: 500 GB on Solid State Drive (SSD) + extra space for paid content ; Discrete video card NVIDIA/AMD with 8GB VRAM+; joystick; requires internet activation. Recommended VR systems requirements (VR graphics settings): OS 64-bit Windows 10; DirectX11; CPU: Core i5+ at 3+ GHz or AMD FX / Ryzen; RAM: from 32 GB; Free hard disk space: 500 GB on Solid State Drive (SSD); Discrete video card NVIDIA/AMD from 8GB VRAM; Joystick; requires internet activation. But it's rarely hardware limit. More like a recommendation. If you use High textures settings on new DCS maps and modules it will eat RAM and VRAM easily, even above 16GB. It also depends on the mission. Edited April 1 by draconus Win10 i7-10700KF 32GB RTX4070S Quest 3 T16000M VPC CDT-VMAX TFRP FC3 F-14A/B F-15E CA SC NTTR PG Syria
Mr_sukebe Posted April 1 Posted April 1 (edited) 1 hour ago, draconus said: The game will use whatever amount of RAM and VRAM it needs when available. .. Again, we can now see how much is RESERVED, which seems to be pretty much all of it, and how much is USED, which is clearly NOT the same. I've yet to see DCS USING more than 12GB, regardless of the amount reserved, though that is all single player. Most of my single player missions seem to USE around 6-7GB of VRAM Edited April 1 by Mr_sukebe 7800x3d, 5080, 64GB, PCIE5 SSD - Oculus Pro - Moza (AB9), Virpil (Alpha, CM3, CM1 and CM2), WW (TOP and CP), TM (MFDs, Pendular Rudder), Tek Creations (F18 panel), Total Controls (Apache MFD), Jetseat
Tenkom Posted April 1 Posted April 1 2 hours ago, Mr_sukebe said: Again, we can now see how much is RESERVED, which seems to be pretty much all of it, and how much is USED, which is clearly NOT the same. I've yet to see DCS USING more than 12GB, regardless of the amount reserved, though that is all single player. Most of my single player missions seem to USE around 6-7GB of VRAM I'm usually on one of the 4ya servers where there are hundreds of units. So probably worst case.
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