[Bug 234044] graphics/drm-kmod: kernel: Failed to add WC MTRR for [0xe0000000-0xefffffff]: -22; performance may suffer

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234044

            Bug ID: 234044
           Summary: graphics/drm-kmod: kernel: Failed to add WC MTRR for
                    [0xe0000000-0xefffffff]: -22; performance may suffer
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: jmd at freebsd.org
          Reporter: phascolarctos at protonmail.ch
          Assignee: jmd at freebsd.org
             Flags: maintainer-feedback?(jmd at freebsd.org)

I get the following message when loading the i915dms.ko module:
kernel: Failed to add WC MTRR for [0xe0000000-0xefffffff]: -22; performance may
suffer

Performance do not suffer in a significant manner, however I think there might
be a slight penalty (supertuxkart does not run as smoothly as I would expect).

This is the relevant part of my system log:

kernel: drmn0: <drmn> on vgapci0
kernel: vgapci0: child drmn0 requested pci_enable_io
syslogd: last message repeated 1 times
kernel: [drm] Memory usable by graphics device = 2048M
kernel: Failed to add WC MTRR for [0xe0000000-0xefffffff]: -22; performance may
suffer
kernel: [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
kernel: [drm] Driver supports precise vblank timestamp query.
kernel: [drm] Connector LVDS-1: get mode from tunables:
kernel: [drm]   - kern.vt.fb.modes.LVDS-1
kernel: [drm]   - kern.vt.fb.default_mode
kernel: [drm] Connector VGA-1: get mode from tunables:
kernel: [drm]   - kern.vt.fb.modes.VGA-1
kernel: [drm]   - kern.vt.fb.default_mode
kernel: [drm] Connector HDMI-A-1: get mode from tunables:
kernel: [drm]   - kern.vt.fb.modes.HDMI-A-1
kernel: [drm]   - kern.vt.fb.default_mode
kernel: [drm] Connector DP-1: get mode from tunables:
kernel: [drm]   - kern.vt.fb.modes.DP-1
kernel: [drm]   - kern.vt.fb.default_mode
kernel: [drm] Initialized i915 1.6.0 20170123 for drmn0 on minor 0
kernel: VT: Replacing driver "efifb" with new "fb".
kernel: start FB_INFO:
kernel: type=11 height=768 width=1366 depth=32
kernel: cmsize=16 size=4227072
kernel: pbase=0xe0236000 vbase=0xfffff800e0236000
kernel: name=drmn0 flags=0x0 stride=5504 bpp=32
kernel: cmap[0]=0 cmap[1]=7f0000 cmap[2]=7f00 cmap[3]=c4a000
kernel: end FB_INFO
kernel: drmn0: fb0: inteldrmfb frame buffer device

I never had problems with the i915kms.ko module from kernel. However, because
of the announce that its code will be removed in 13.0, I made the transitition
to the drm-kmod passage.
I am on 12.0-RELEASE. The port installed by the metaport is
drm-fbsd12.0-kmod-g20181210.

The details of my graphic controller can be find here:
https://ark.intel.com//products/72061/Intel-Celeron-Processor-1007U-2M-Cache-1_50-GHz

A similar issue has been discussed in the past here:
https://github.com/FreeBSDDesktop/DEPRECATED-freebsd-base-graphics/issues/144

I was unsure if it was better to report the bug here or on github. Finally I
thought that a report here was a good idea as it does concern FreeBSD as an OS;
if an issue is opened on github (as it probably should) it can be easily
linked. Moreover, this bug report will probably be easier to find, in
particular by users not used to github.

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