DragonflyBSD 6.2.1 very slow on Thinkpad T460

[Michael Neumann]

On Mon, Jan 17, 2022 at 09:37:47PM +0100, Fritjof wrote:
> Hi,

Hi,

> I have installed DragonflyBSD 6.2.1 on my Thinkpad T460 with Hammer2.
> But I discoverd the following problem:
> - browsing with Firefox is incredibly slow, even moving the browser window jerks

Have you tried chrome?

> - htop(1) shows that one of four CPU cores is also always at 100%

Is it at 100% when firefox is running? X11 is running? On the console?

You might have an interrupt storm! Run `systat -v` and look at the right
side for "Interrupts". The numbers should not be too high.

> - I found the following message in via dmesg:
>   % dmesg | grep error
>   dm_target_error: Successfully initialized
>   WARN_ON(domain->wake_count == 0)<4>WARN_ON(domain->wake_count == 0)<4>WARN_ON(domain->wake_count == 0)error: [drm:pid233:gen8_gmch_probe] *ERROR* Can't set DMA mask/consistent mask (-5)
>   i915/skl_dmc_ver1_26.bin: could not load firmware image, error 2
>   error: [drm:pid922:intel_dp_aux_wait_done] *ERROR* dp aux hw did not signal timeout (has irq: 1)!
>   error: [drm:pid922:intel_dp_aux_wait_done] *ERROR* dp aux hw did not signal timeout (has irq: 1)!
>   error: [drm:pid922:intel_dp_aux_wait_done] *ERROR* dp aux hw did not signal timeout (has irq: 1)! 
> - % dmesg | grep i915
>   i915/skl_dmc_ver1_26.bin: could not load firmware image, error 2
>   drm0: Failed to load DMC firmware i915/skl_dmc_ver1_26.bin. Disabling runtime power management.
>   [drm] Initialized i915 1.6.0 20171023 for dev_name on minor 0
>   i915: warning, request 0xfffff800ce7d8bc0 not completed

This is "normal". I get the same output. Though I wonder whether we can
improve here!

> The i915 module is loaded:
> % kldstat
> Id Refs Address            Size     Name
>  1   21 0xffffffff80200000 1ad5398  kernel
>  2    1 0xffffffff81cd6000 c808     ehci.ko
>  3    1 0xffffffff81ce3000 ce90     xhci.ko
>  4    2 0xffffffff81cf0000 120e0    dm.ko
>  5    1 0xffffffff81d03000 1be98    dm_target_crypt.ko
>  6    1 0xffffffff82b1f000 1d990    if_iwm.ko
>  7    1 0xffffffff82b3d000 2068e8   iwm8000Cfw.ko
>  8    1 0xffffffff82d44000 1bb260   iwm8265fw.ko
>  9    1 0xffffffff83800000 118000   i915.ko
> 10    1 0xffffffff83918000 70000    drm.ko
> 11    1 0xffffffff83988000 1000     iicbus.ko
> 
> 
> I use the standard kernel and just load the iwm and i915 modules via /boot/loader.conf and /etc/rc.conf.
> Does anyone has an answer or hint how to fix this?

Did you configure the intel driver in /etc/X11/xorg.conf? Can you show
your "Device" section? It should look like this:

	Section "Device"
        	Identifier  "Card0"
		# Option "AccelMethod" "XAA"
        	Driver      "intel"
        	BusID       "PCI:0:2:0"
	EndSection

Do you see any Warnings (WW) or Error (EE) in /var/log/Xorg.0.log when
you start X? There are some AccelMethod's that you can try if things
don't work out of the box.

Regards,

  Michael