Latency test

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21 Jan 2023 18:38 #262599 by Stanislavz
Replied by Stanislavz on topic Latency test

I was eager to get BTRFS and F2FS squared away...

Installer now supports BTRFS, EXT4, F2FS and XFS.

1 file changed, 402 insertions(+), 32 deletions(-)
 

Super. Give me your adress will send floppy disks.

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23 Jan 2023 16:24 #262748 by NTULINUX
Replied by NTULINUX on topic Latency test

I was eager to get BTRFS and F2FS squared away...

Installer now supports BTRFS, EXT4, F2FS and XFS.

1 file changed, 402 insertions(+), 32 deletions(-)
 
Super. Give me your adress will send floppy disks.
 

Heh, the installer actually works with systemrescuecd but should work just fine with Debian Bookworm (Bullseye not new enough)

Once I have the Gentoo image ready, I'll post instructions on how to use the installer, burn the ISO, etc.

Waiting on the next PREEMPT_RT kernel and there's a bug right now in LinuxCNC git master that prevents it from starting atm. Have yet to test the fix from Seb, but it's a python opengl bug:

github.com/LinuxCNC/linuxcnc/issues/2264

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23 Jan 2023 18:52 #262756 by rodw
Replied by rodw on topic Latency test
If you install a X11 environment (like XFCE), that bug will not bite you. Its only a Wayland thing.
But Gmocappy probably won't run. It has bigger issues that have not been addressed

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24 Jan 2023 22:13 #262837 by NTULINUX
Replied by NTULINUX on topic Latency test

If you install a X11 environment (like XFCE), that bug will not bite you. Its only a Wayland thing.
But Gmocappy probably won't run. It has bigger issues that have not been addressed

I hit that problem with LXQt and XFCE, been taking a break for awhile. Just so you guys know, touchscreens and touchpads will not work. There's way too many variants and drivers, and I've even seen laptops with conflicting synaptics/rmi4 drivers but both had to be on for it to work. Gmoccapy itself should be fine but the X11 and kernel drivers for touchpads will not be included, unable to test due to no hardware and they're too finnicky.

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07 Feb 2023 22:11 #263979 by Lcvette
Replied by Lcvette on topic Latency test

Stanislavz post=261661 userid=33900 

All night glxgears with youtube. But only one testing thread.. otherwise we have two processes on core optimised to run only one...

I just installed bookworm on an older ASRock H97M Pro4 with G3258 Pentium processor which used to have sub 10k latency but now on bookworm has pushed up to 76k.  I would like to get it back down but most of what you guys have mentioned here is completely over my head.  could you put a single page settings post with your best results for bookworm on 6.1 kernel?  and if you don't mind could you put where the settings can be found?  I am sure many would very much appreciate the testing and results you have found!

Thanks in advance!!

Chris

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07 Feb 2023 22:38 #263983 by Lcvette
Replied by Lcvette on topic Latency test
if its helpful here is some information on my system if you have any suggestions for it specifically :D

 

File Attachment:

File Name: uname_a_ls...info.txt
File Size:10 KB
Attachments:

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12 Feb 2023 03:56 - 12 Feb 2023 03:58 #264338 by NTULINUX
Replied by NTULINUX on topic Latency test
I'm really curious about this at24 EEPROM driver..

What happens if you do:
sudo -i
echo "install at24 /bin/true" &> "/etc/modprobe.d/at24.conf"
exit

Then reboot? Does everything still work? That would disable the AT24 EEPROM driver, no idea why that's showing up on both your Intel systems but just wondering if it breaks anything noticeable.
lsmod | grep "at24"

Should return nothing after the reboot.
Last edit: 12 Feb 2023 03:58 by NTULINUX. Reason: more info, fix-ups

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15 Feb 2023 00:08 - 15 Feb 2023 00:14 #264535 by royka
Replied by royka on topic Latency test
You could try to change the isolcpus=nohz,domain,1 to isolcpus=1
Or add nohz_full=1 or idle=poll
Especially adding nomodeset as Stanislav said helped a lot for me.

Also this helped a bit on mine system to get rid of some spikes.
Option "AccelMethod" "uxa"
In /etc/X11/xorg.conf.d/20-intel...
Or /etc/X11/xorg.conf

Like
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
Option "AccelMethod" "uxa"
EndSection

You could also try to add these options:
Option "TearFree" "false"Option "TripleBuffer" "false"Option "SwapbuffersWait" "false"

Info from:
​​​​https://wiki.archlinux.org/title/intel_graphics#Enable_early_KMS

The intel related options including nomodeset could work when you see an increase in latency the moment you move a window across the screen or when you scroll on a YouTube page or something 
Last edit: 15 Feb 2023 00:14 by royka.
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14 Sep 2023 21:44 #280788 by NTULINUX
Replied by NTULINUX on topic Latency test
The installer and Gentoo PREEMPT_RT image is ready for testing:

openlunchbox.com/mw19/index.php/HOWTO:_Gentoo_for_LinuxCNC

The kernel is not as generic as the Debian kernel so please let me know of any missing features or problems.
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