5 posts tagged with "hw"

For this holiday season my friend had an idea to make a traditional Lithuanian straw mobile but with a twist: lets use a LED strip to make it shine, and lets make it big!

Neseniai teko debuginti esphome generuojamą PWM signalą, kuris valdo servo motorą. Iki galo suprasti kas vyksta padėjo osciloskopas veikiantis ant 8.5EUR RPi Pico mikrovaldiklio.

I was fortunate enough to upgrade my CPU to AMD Ryzen 9 5950x, and I figured to do a frametime and utilization comparison in iRacing using fpsVR.

I had recently acquired three Google WiFi pucks to upgrade the networking setup in my current apartment. I have had a pretty good experience with Google WiFi when I set it up at my parents home almost a year ago.

I have just recently started iRacing and this week I was racing quite a bit in the Lime Rock Park with MX-5. Unfortunately I used to get around 60 FPS during starts and that is a very tense part of the race. Every frame counts during those moments. Since I have a pretty decent system, I though I should be able to get more FPS in VR. My relevant PC specs are:

Intel i7-4790K, 32GB Ram, Radeon VII and Samsung Odyssey+

First I turned down most of the graphics settings in iRacing. But even if turning off cubemaps and shadows would bump the FPS quite a bit, it was still far from solid 90. Then I noticed that some parts of the track are fine, but others are still choppy. Turning off Event Objects, Crowds and Grandstands helped with that a bit, but still no cigar.

Then after quite a bit of searching I noticed old forum threads regarding the multi-thread usage of iRacing almost three years ago, where setting CPU affinity of iRacing to a single core would help quite a bit. But that was acknowledged as a bug and was fixed in iRacing since. I tried setting affinity anyways, but I would get "Access Denied" (even when running with Admin rights) from Task Manager.

So finally today I took the plunge and rebooted to BIOS (or more correctly to UEFI F/W) and turned off HyperThreading and voila, 90 FPS throughout all the race I just did.

Here are the render stats from the excellent fpsVR of the last session before turning off HT and then with the HT turned off:

HT ON

HT OFF

HT ON

HT OFF

The median frametimes did not drop that much, but the 99.9th percentile (1 out of 1000) of CPU frametimes crucially did not reach 11ms - the amount of time available to render a frame, if GPU is pushing 90FPS.

Hope this is useful and helps to someone else as well.