Re: SOLVED Re: Sloow blender on FreeBSD (vs Ubuntu)
- In reply to: Harry Schmalzbauer : "Re: SOLVED Re: Sloow blender on FreeBSD (vs Ubuntu)"
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Date: Sat, 20 Jan 2024 17:54:08 UTC
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.