[Bug 51836] New: d3d: Disable CSMT by default if using llvmpipe OpenGL renderer backend
https://bugs.winehq.org/show_bug.cgi?id=51836 Bug ID: 51836 Summary: d3d: Disable CSMT by default if using llvmpipe OpenGL renderer backend Product: Wine Version: 6.18 Hardware: x86-64 OS: Linux Status: UNCONFIRMED Severity: normal Priority: P2 Component: directx-d3d Assignee: wine-bugs(a)winehq.org Reporter: jinoh.kang.kr(a)gmail.com Distribution: --- llvmpipe is a software-only OpenGL implementation. It compiles GLSL shaders into native CPU code using LLVM, offering reasonable graphics performance on systems where hardware graphics acceleration is otherwise not available. The problem is that llvmpipe does not play nicely with Wine's CSMT feature. CSMT assumes the OpenGL backend to be a proxy that submits rendering commands to GPU, rather than a full-blown computation engine itself. The source and sink of the comman stream is the CPU itself, and llvmpipe supports direct multithreading -- making CSMT redundant. For testing/benchmark, llvmpipe can be activated on Linux with the environment variable `LIBGL_ALWAYS_SOFTWARE=1`. With CSMT, perf shows `wined3d_cs_mt_finish` to be the major overhead; without CSMT, the bottleneck is absent and the app exhibits noticeable performance improvement. Example glxinfo output on system with llvmpipe enabled: OpenGL vendor string: Mesa/X.org OpenGL renderer string: llvmpipe (LLVM 11.0.0, 256 bits) ... Extended renderer info (GLX_MESA_query_renderer): Vendor: Mesa/X.org (0xffffffff) Device: llvmpipe (LLVM 11.0.0, 256 bits) (0xffffffff) -- Do not reply to this email, post in Bugzilla using the above URL to reply. You are receiving this mail because: You are watching all bug changes.
https://bugs.winehq.org/show_bug.cgi?id=51836 --- Comment #1 from Jinoh Kang <jinoh.kang.kr(a)gmail.com> --- On older Mesa versions: OpenGL vendor string: VMware, Inc. OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 3.9, 256 bits) ... (ditto for strings) -- Do not reply to this email, post in Bugzilla using the above URL to reply. You are receiving this mail because: You are watching all bug changes.
https://bugs.winehq.org/show_bug.cgi?id=51836 Zebediah Figura <z.figura12(a)gmail.com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |z.figura12(a)gmail.com --- Comment #2 from Zebediah Figura <z.figura12(a)gmail.com> --- Broadly speaking, what you're probably seeing is bug 44315. I.e. we shouldn't stall waiting for the CS thread in so many cases. I think we need the CS thread for other reasons that have to do with OpenGL context/threading rules (e.g. queries need to be started and ended on the same context?), but I'm a bit fuzzy on the details. -- Do not reply to this email, post in Bugzilla using the above URL to reply. You are receiving this mail because: You are watching all bug changes.
https://bugs.winehq.org/show_bug.cgi?id=51836 jank9525 <thieujank(a)gmail.com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |thieujank(a)gmail.com --- Comment #3 from jank9525 <thieujank(a)gmail.com> --- Its more or less the same for me . No difference -- Do not reply to this email, post in Bugzilla using the above URL to reply. You are receiving this mail because: You are watching all bug changes.
https://bugs.winehq.org/show_bug.cgi?id=51836 Jinoh Kang <jinoh.kang.kr(a)gmail.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |DUPLICATE --- Comment #4 from Jinoh Kang <jinoh.kang.kr(a)gmail.com> --- Cannot reproduce on latest Wine. Assuming duplicate of bug 44315 for now. *** This bug has been marked as a duplicate of bug 44315 *** -- Do not reply to this email, post in Bugzilla using the above URL to reply. You are receiving this mail because: You are watching all bug changes.
https://bugs.winehq.org/show_bug.cgi?id=51836 Jinoh Kang <jinoh.kang.kr(a)gmail.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|RESOLVED |CLOSED --- Comment #5 from Jinoh Kang <jinoh.kang.kr(a)gmail.com> --- Closing. -- Do not reply to this email, post in Bugzilla using the above URL to reply. You are receiving this mail because: You are watching all bug changes.
https://bugs.winehq.org/show_bug.cgi?id=51836 Jinoh Kang <jinoh.kang.kr(a)gmail.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Summary|d3d: Disable CSMT by |d3d: CSMT performance drop |default if using llvmpipe |if using llvmpipe OpenGL |OpenGL renderer backend |renderer backend -- Do not reply to this email, post in Bugzilla using the above URL to reply. You are receiving this mail because: You are watching all bug changes.
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