Since sometime i notice that war thunder is running slower on =
my machine using
mesa-git, but as the game is always updating, i (wrongly) blamed some game
update.=20
Yet, some days ago, after a test with a steamOS, i could confirm that older
mesa versions worked faster than mesa-git, with the same game version. I
excluded the kernel version, so i have done a mesa bisect and found the (ol=
d)
commit that made war thunder lost about 28% performance on my setup (RX480 =
on a
A10-7850k):
commit ac6007460adaf4bb21028a3281ec622d1e43df49
Author: Marek Ol=C5=A1=C3=A1k <marek.olsak@amd.com>
Date: Wed Feb 15 19:50:15 2017 +0100
radeonsi: upload constants into VRAM instead of GTT
This lowers lgkm wait cycles by 30% on VI and normal conditions.
The might be a measurable improvement when CE is disabled (radeon)
or under L2 thrashing.
I'm running slackware64 -current, with kernel 4.12.1, LLVM 4.0.1 and the ga=
me
is free, so you can test it. For the bisect i started the game, run the CPU
benchmark (as workaround some bug where most first benchmarks are slower) a=
nd
then run the "still scene" benchmark. as is the shorter one, but=
all others=20
had performance drop.