4 hours ago, kand said:

Why all this talk of turning Hyperthreading off in BIOS? why not just run the affinity mask to block the threads from running on the logical cores and only allow P3d to use the physical cores? best of both worlds then when it comes to your other applications which may benefit 

Excellent Question! And here is my answer. The point of hyperthreading is that many times when you are executing code on the processor, there are parts of the processor that are idle. By including an extra set of CPU registers, the processor can act like it has two cores and thus use all parts of the processor in parallel. When 2 threads both need to use one component of the processor, then one thread ends up waiting! This waiting can cause performance issues in P3D. If all you do is set an affinity mask and don't turn off hyperthreading your logical cores are still trying to execute 2 threads in parallel on the cores that you masked. If you turn hyperthreading off you restrict each logical core to 1 thread thus no more waiting when 2 threads are trying to execute at the same time. Each thread gets it own core all to itself. 

Give it a try. You can always turn it back on.

I will have a look later, but not sure if HT can be turned off on my Laptop Bios.

 

On 12/4/2018 at 9:24 AM, Langyboy63 said:

Bnash,

Hyper threading off?

I have heard this before, could you just explain how you do this, I assume it is at the boot menu somewhere.

The biggest improvements i have seen are when I use Process Lasso to move P3d on the processors 2-7 and everything else onto the remaining processors.

I use a Gaming Laptop with a GTX980m GPU, have tried different tweaks, but find that if the worse blurries occur when using shader enhancers like PTA tweaks, so I only use the Enshade default shaders and find if I regularly delete the shaders this helps. 

There is always a bit of a trade off between performance and appearance, but with Vsync set to 1/2 (60hz monitor) and frame rate limiter to 29.5FPS and Vsync on and unlimited frames with Triple Buffering in P3d, I am getting the best results I have ever seen without any CFG tweaks at all.

Don't forget, the poster has 6 physical cores.

P3D only use 5 or 6 efficiently.

If, like me, you have 4 physical cores and 8 threads, HT should be on, but only using 5.

I use 244 for an i7 7700k.

Perfect.

Edited December 9, 20187 yr by Gabe777

this HT ON/OFF discussion has gone for ages now.

@SteveW shared with us a great test procedure to determine which Affinity mask will work better with user processor. after working with 8 different AM combinations with HT ON it turned out that my I7 6700K @4.4 didin't start P3D V4.3 as fast as HT OFF @4.6. 

So I decided to turn off HT and no AM in cfg.

Now, that was my experience, I run the test and came to that conclusion. But for some people it worked and they preferred HT ON with the optimal AM.

Based on this, I have bought a i7 9700k and not the 9900k because I won't be using HT anymore.