DRI2 vs. DRI3 Radeon Linux OpenGL Performance

[kaprikawn]

DRI3 is already enabled by default in mesa.
http://cgit.freedesktop.org/mesa/mes...figure.ac#n762

Since 2014:
http://cgit.freedesktop.org/mesa/mes...39ab3db31fffd9

I think it's a build-time option, so whomever builds mesa has the option either way. And I'm pretty sure the build in the default pacman repo doesn't have it enabled, correct me if I'm wrong.

[AnAkIn]

I think it's a build-time option, so whomever builds mesa has the option either way. And I'm pretty sure the build in the default pacman repo doesn't have it enabled, correct me if I'm wrong.

The option is turned on by default for Linux builds, it doesn't need to be specified.

[Adriannho]

The option is turned on by default for Linux builds, it doesn't need to be specified.

Then it means arch specifically turns it off by default. Trust me, I tried enabling it but it doesn't work.

Mesa build from lcarlier on the other hand, works as it should.

[AnAkIn]

Then it means arch specifically turns it off by default. Trust me, I tried enabling it but it doesn't work.

Mesa build from lcarlier on the other hand, works as it should.

https://projects.archlinux.org/svntogit/packages.git/tree/trunk/PKGBUILD?h=packages/mesa#n34

It's not turned off in mesa PKGBUILD, and it was working last time I've tried. Will try again later.

[roboman2444]

Thus the difference will only appear when we render faster than the screen can show, meaning no user side improvement.

Thats an improvement for some, as Xonotic, darkplaces, and many open source games only take input once per frame. Its why i disable vsync when using any of these games, because 400 input ticks per second is noticably better than 60. While 500->400 is not as big of a difference as 400->60, it may help.

[higuita]

Trying to enable DRI3 i get this:
[ 25369.650] (WW) RADEON(0): Option "DRI3" is not used

man radeon do not show any DRI3 option... i'm using xf86-video-ati-7.5.0, mesa-11.0.4 (with --enable-dri3), libdrm-2.4.65 and xorg-server-1.17.3

also, kernel 4.2.5 on a slackware64

Any tip why it is failing and how to fix this

[drSeehas]

... I think only one of these GPUs would need to be tested for that. We got the gist, I don't think all 3 need to be compared.

So you think Northern Islands, Southern Islands and Sea Islands all behave the same?

[aceman]

Trying to enable DRI3 i get this:
[ 25369.650] (WW) RADEON(0): Option "DRI3" is not used

man radeon do not show any DRI3 option... i'm using xf86-video-ati-7.5.0, mesa-11.0.4 (with --enable-dri3), libdrm-2.4.65 and xorg-server-1.17.3

So how did you try to enable the option? It seems the X server didn't pick up your setting. For me on Slackware it seems to work.

[Pontostroy]

Trying to enable DRI3 i get this:
[ 25369.650] (WW) RADEON(0): Option "DRI3" is not used

man radeon do not show any DRI3 option... i'm using xf86-video-ati-7.5.0, mesa-11.0.4 (with --enable-dri3), libdrm-2.4.65 and xorg-server-1.17.3

also, kernel 4.2.5 on a slackware64

Any tip why it is failing and how to fix this

Option "DRI" "3"

like on intel

[Guest]

Trying to enable DRI3 i get this:
[ 25369.650] (WW) RADEON(0): Option "DRI3" is not used

man radeon do not show any DRI3 option... i'm using xf86-video-ati-7.5.0, mesa-11.0.4 (with --enable-dri3), libdrm-2.4.65 and xorg-server-1.17.3

also, kernel 4.2.5 on a slackware64

Any tip why it is failing and how to fix this

It's probably not a definitive way of checking, but if the version of the xf86-video-ati driver isn't 7.5.99 or higher; DRI3 isn't supported based on what I've seen (yours appears to be 7.5.0). I could attest to this on both Ubuntu and Fedora.