Massive Latency, and no PCI port Acer

seuchato wrote: I'll study a possibility to determine if cpu freq scaling is active from my script.

I would not bother with it as new CPU's and mobo's do not care what the operating systems sets them to, they just do what they are programmed to.

seuchato wrote: I am also thinking of probably using "cpuspeed" to set the min and max speed at the same below max speed value for thermal reasons. Do you have any experience on this?

Linux does have cpu governor included, but on most PC's i use even setting the governor to "performance" does not keep the CPU from lowering the frequency as it should.

seuchato wrote: Also I suggest a table with all the bios options to play with.

Given all the BIOS vendors and versions, it would be very messy, especially due to the naming conventions ( or lack thereof ), but having a rough list of stuff is doable.
I think i wrote about this, but here it is again:
Lately i have noticed that when using LinuxCNC and latency test the CPU speed will vary on some PC's despite everything disabled in BIOS, but that will not happen while running latency histogram, the frequency will not change while the GUI version of latency histogram is running. That seems strange and that is the reason that lately when replying to latency figures posted by other members i always use the "should work" expression as i am aware that latency histogram numbers might be very good, but using LinuxCNC might still allow for latency excursions.

I Did find some more items to disable in the bios. When it booted the computer blew out some dust, apparently the fan hasn’t ran in a while.

Round 2

Seems a common bios and I think you turned off what seems appropriate. I dunno if wake up from usb mouse/keyboard will affect latency, however, do you really need this? If not, just turn it off.

Would be nice to see the effect of your latest adjustments on latency.

greez
chris

update: forgot to mention: LAN could remain enabled and should be if you are going to use mesa ethernet

I couldn't find the previous screenshot from before the BIOS Changes

That is not usable.
You should remove the CPU cooler and clean it and the cpu properly, then add some thermal paste and reseat the cooler. Also check if the fan is spinning freely.
If you have more than one bank of memory, try removing them and test one by one.