Performance issues with integrated intel GPUs

[jikuja]

Three newest generations of intel HD graphics GPU drivers seems to have bug which decreases performance. Current workarounds:

• ask user to use other GPU if available.
• ask user to wait patiently while MC is loading

Summary of my my findings:

• Opengl drivers works but MC/forge load is really slow. Examples: http://paste.feed-the-beast.com/view/087c8312 notice timestamps in lines 6311 and 6322. Log with stacktraces: http://paste.feed-the-beast.com/view/a236c548. Clean stacktrace: https://paste.ee/p/PYVjj
• Present with multiple operating systems(at least with windows 8 and windows 10) and java versions
• drivers version 10.18.15.4248. (One months old support request with similar symptoms was using 10.18.15.4235 but might be caused by bad memory allocation)
• driver version: GL info: ' Vendor: 'Intel' Version: '4.2.0 - Build 10.18.10.3540' Renderer: 'Intel(R) HD Graphics 4600' does not have performance problems. (Sorry I misplaced log for this :/) Source for this driver version?
• Disabling new forge load screen does not fix this
• Can't test this personally or write SSCCE. No hardware access.

My personal notes: https://paste.ee/p/RNmFU includes links to logs, lists of driver/OS/java versions

Does anyone has access for hardware and good knowledge of opengl to write SSCCE?

Ping #119

[Spasi]

Like issue 119, this cannot be something that LWJGL is able to fix. Isn't there an issue open for this at bugs.mojang.com?

Anyway, it looks like some texture creation/generation is taking place between 6311 and 6322. It could be something simple like a data format that forces the Intel driver out of the fast path. Using GL_BGRA and GL_UNSIGNED_INT_8_8_8_8_REV for texture uploads is known to be much faster on Intel hardware. Could someone produce a trace of LWJGL methods called during the slow part?

[grum]

Using GL_BGRA and GL_UNSIGNED_INT_8_8_8_8_REV for texture uploads is known to be much faster on Intel hardware.

Is there a public list/repo/collection of these 'known' things that are 'faster'?

[Spasi]

Search for intel GL_UNSIGNED_INT_8_8_8_8_REV and you'll find several references.

I started using it in LWJGL-FX, where texture transfer performance is critical. It made a huge difference on Intel hardware and hadn't any negative impact on other code paths or GPUs.

It might be entirely irrelevant to the problem of course, I don't know what Minecraft's doing there.

[grum]

Yeah, nice that vendors actually document these things .

To my surprise I picked exactly that way to upload the data just because it 'felt the easiest' to from the ARGB BufferedImage provides to BGRA the gpu seems to accept.

@jikuja maybe some mod/plugin uses another way to upload and not the one the game provides?

[jikuja]

I fear I have nothing more to give for this discussion with my nonexistent opengl knowledge and with minor forge knowledge.

Should we ping forge devs?