Intel Preparing Resizable BAR Support For Their Arc Graphics On Linux

[phoronix]

Phoronix: Intel Preparing Resizable BAR Support For Their Arc Graphics On Linux

Ahead of the Intel Arc "Alchemist" graphics cards shipping this year, Intel's open-source developers have continued ironing out the Linux driver support. The most recent kernel patches are for getting their Resizable BAR "ReBAR" support in order...

https://www.phoronix.com/scan.php?page=news_item&px=Intel-DG2-ReBAR-Linux-Prepare

[sarmad]

Doesn't look like Resizable Bar has any noticeable impact (yet?). I wonder if games need to be built with ReBar in mind in order to see noticeable difference.

https://www.rockpapershotgun.com/what-is-resizable-bar-and-should-you-use-it

[Linuxxx]

Doesn't look like Resizable Bar has any noticeable impact (yet?). I wonder if games need to be built with ReBar in mind in order to see noticeable difference.
https://www.rockpapershotgun.com/wha...uld-you-use-it

At least VKD3D-Proton (DX12-to-Vulkan) can already benefit from ReBAR.

From the 2.5 release notes:

Performance

Resizable BAR can improve GPU performance about 10-15% in the best case, depends a lot on the game.
Horizon Zero Dawn and Death Stranding in particular improve massively with this change.

[cl333r]

Doesn't look like Resizable Bar has any noticeable impact (yet?). I wonder if games need to be built with ReBar in mind in order to see noticeable difference.
https://www.rockpapershotgun.com/wha...uld-you-use-it

Yeah, so much noise about ReBar you'd think it adds at least 20% of performance but you're lucky if you get 2%.

But I imagine there are corner cases where it's truly needed.

[CommunityMember]

I don't understand why rebar is so hard to deal with. I can walk into Home Depot and obtain rebar in many sizes (and lengths), and if it is a large project, have it shipped by the truckload....

[smitty3268]

Yeah, so much noise about ReBar you'd think it adds at least 20% of performance but you're lucky if you get 2%.

But I imagine there are corner cases where it's truly needed.

I think that must be an NVidia issue? Or being charitable, maybe their driver and/or hardware already had optimizations that make ReBar less of an issue for them.

Most tests on AMD that i've seen do seem to show real gains, although usually only in the 2%-10% range so not that major.