Date: Sat, 20 Jan 2024 18:54:08 +0100 From: Jan Beich <jbeich@FreeBSD.org> To: Harry Schmalzbauer <freebsd@omnilan.de> Cc: freebsd-x11@freebsd.org Subject: Re: SOLVED Re: Sloow blender on FreeBSD (vs Ubuntu) Message-ID: <le8j-dh6n-wny@FreeBSD.org> In-Reply-To: <04cfd508-1f1e-4dab-ad7a-3ae94f7871a9@omnilan.de> (Harry Schmalzbauer's message of "Sat, 20 Jan 2024 17:53:40 %2B0100") References: <86mtxk8xb8.fsf@virtual-earth.de> <86lfd4tvc4.fsf@virtual-earth.de> <86bldsd7dw.fsf@virtual-earth.de> <86bldowdkk.fsf@virtual-earth.de> <04cfd508-1f1e-4dab-ad7a-3ae94f7871a9@omnilan.de>
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Harry Schmalzbauer <freebsd@omnilan.de> writes:
> And regarding performance, I'd like to share that
> using x11-drivers/xf86-video-intel slows down XFCE4 by some orders of
> magnitude compared to the 'modesetting' (xorg builtin component)
> driver.
This is a known issue with xf86-video-intel defaults:
- upstream disables DRI3 by default, requiring downstream to pass --with-default-dri=3
- FreeBSD port disables SNA by default (see comment about --with-default-accel=uxa)
I have the following in xorg.conf(5) from >4 years ago (no longer dogfood Xorg):
Section "Device"
Identifier "integrated_card"
Driver "intel"
Option "AccelMethod" "SNA"
Option "DRI" "3"
Option "TearFree" "false" # redundant with x11-wm/picom
Option "TripleBuffer" "false" # lower latency and maybe unnecessary with x11-wm/picom
BusID "pci:0:2:0" # hint for multi-GPU setups
EndSection
See also https://lists.freebsd.org/pipermail/freebsd-x11/2021-May/028125.html
which affects both modesetting and xf86-video-intel but so far no one reproduced.
Nowadays, modesetting causes stutters for me unless LIBGL_DRI3_DISABLE=1.
Xorg perf regressions likely come from mesa-dri and drm-kmod updates but
the latter is non-trivial to bisect as LinuxKPI is a moving target.
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