Massive Latency, and no PCI port Acer

Edit:OOPS! I see what I did wrong there

I think I figured out how to change GRUB_CMDLINE_LINUX_DEFAULT on the original acer

either it didn't work or I did it wrong. Latency 15Million

GRUB_DEFAULT=0
GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=0
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_idle.max_cstate=0 processor.max_cstate=1 idle=poll isolcpus=x"
GRUB_CMDLINE_LINUX=""

I get this whenever I try to edit GRUB_CMDLINE_LINUX_DEFAULT

** (gedit:2585): WARNING **: : Set document metadata failed: Setting attribute metadata::gedit-encoding not supported

WOW!!!

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash idle=poll isolcpus=2,3"

Quick test:
servo thread:109k
Base thread: 481K

Way down from 15million, now I can try the script for the latency maybe? It just ran and closed before I believe since it was over 1m

Still very high numbers, Do you still have an nvidia gpu in that system? If: get rid of it, use matrox, on board, or else but *not* nvidia. I never got good results with nvidia.

If you run the script, it will prompt all relevant hardware and relevant other data that might still be required. Post your results here . Later in the process, you might get the system run with a better latency. If kindly document the changes, for others to see.

If that machine has a bios with options, kindly also document the settings of these options. My script cannot see these options.

I usually set the following (if available):

• Hypertreading off
• sound off
• grafics to onboard (that should be a way in your case, as to my experience core 2 have a well working onboard gpu in them
• virtualization off
• ...
• (if nothing helps) multicore off

hth chris

Just went back and reread the original topic,
-Mesa does have PCI-E anything IO cards, namely the 6i25 that i use often and some others,
- When running latency script, choose not to run the default, and choose not to use base period/thread.
That 109K should be good for running a Mesa board, be it PCI-E or Ethernet.
I still think that you have something enabled in BIOS that is causing such high latency numbers, so since you have Mint :
- right click on the bottom panel and choose "add to panel"
- Select "CPU frequency scaling monitor" and click add,
- While running any latency test, check that frequency monitor for changes in frequency
If there are changes, speed step or cpu thermal throttling is active, speed step can be disabled in BIOS, thermal throttling also, but i would remove the cpu cooler and check that it is making proper contact with the cpu and the fan is working, then remove the old thermal paste and add new.

Tommy

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

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?

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

Greez
chris