DavidCG

I have played about extensively with CPU Affinity and FSX.CFG and compared the core loadings in Task Manager whilst FSX is in windowed mode. I am aware that this is not an exhaustive test.My conclusions so far are:- Hyperthreading should be turned off. With the Affinity set in the .CFG then my experiments have shown that once the aircraft has been loaded then core loading changes and FSX runs on core 0 and 1 and performance drops regardless of the setting in FSX.CFG. Setting Affinity without using FSX .CFG gives consistent core loading when ever FSX is running and can be applied to any program and not just FSX. I am aware that some people have no problems with setting Affinity in FSX.CFG and thats fine. However, this is not what I have found. My system is an I7 860 runing Windows 7.Kind RegardsDavid Gunton

If you use task manager rather than FSX.CFG to set the Affinity as I mentioned in the first post eg shortcutC:\Windows\System32\cmd.exe /C START "" /AFFINITY E "D:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\fsx.exein the statement "/AFFINITY E" above the "E" is the HEX (not decimal) representation of the cores ie 1110 in this example cores 1, 2 & 3 are assigned to FSX leaving Core 0 to the system.David Gunton

I have found that using[JOBSCHEDULER]Affinitymask =14or any value in the FSX.CFG file does not work. Running FSX and looking in Task Manager, the CPU Affinity is always set to all cores.However, if you create a shortcut with the target at followsC:\Windows\System32\cmd.exe /C START "" /AFFINITY E "D:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\fsx.exeThis will correctly set the affinity to cores 1,2 & 3 leaving core 0 free for the system.This will also work for any program, just change the relevant path.Just thought that you would find this interesting!David Gunton

I have been reading these HT postings for a while now and decided to carry out my own tests in order to make up my own mind as to which was best HT on or off. I have Windows 7 64 bit opereating system.I have HT set to on in the BIOS, Task manager Running with the performance tab visible and FSX running in windowed mode. I have 4 cores 8 processors. First 2 lines in FSX.cfg is[Jobscheduler]Affinitymask=XIf I change the Affintitymask to any value there is no change to core loading as seen on the performance tab. Only cores 0 & 1. Why?If I go into the processes tab of Task Manager look at the FSX process and right click Affinity it always says <All Processors> regardless of the Affinitymask setting.If I manually change the Affinity on the fsx process I get maximum frame rates if I set CPU 2 and 4 to run.I conclude that HT off probably will make sense but my question is why is Affinitymask=X having no effect?Many ThanksDavid Gunton

I have been reading these articles for a while now and decided to carry out my own tests in order to make up my own mind as to which was best HT on or off. I have Windows 7 64 bit opereating system.I have HT set to on in the BIOS, Task manager Running with the performance tab visible and FSX running in windowed mode. I have 4 cores 8 processors. First 2 lines in FSX.cfg is[Jobscheduler]Affinitymask=XIf I change the Affintitymask to any value there is no change to core loading as seen on the performance tab. Only cores 0 & 1. Why?If I go into the processes tab of Task Manager look at the FSX process and right click Affinity it always says <All Processors> regardless of the Affinitymask setting.If I manually change the Affinity on the fsx process I get maximum frame rates if I set CPU 2 and 4 to run.I conclude that HT off probably will make sense but my question is why is Affinitymask=X having no effect?Many ThanksDavid Gunton