Request: Smart Access Memory information

[Berniyh]

Legacy sbios modes put all MMIO apertures under 4GB for 32 bit compatibility. You need an extended MMIO aperture above 4GB in order to resize the BARs.

Meh, this sucks

[fafreeman]

[orlfman@linux64: ~]$  AMD_DEBUG=info glxinfo | grep vram
    vram_size = 16384 MB
    vram_vis_size = 16368 MB
    vram_type = 9
    vram_bit_width = 256
    has_dedicated_vram = 1
[orlfman@linux64: ~]$

10850k + msi z490 unify + amd 6900 xt

[Doomsdayrs]

r1600x + rx6700xt + B350 PC Mate
```
AMD_DEBUG=info glxinfo | grep vram
vram_size = 12288 MB
vram_vis_size = 12272 MB
vram_type = 9
vram_bit_width = 192
has_dedicated_vram = 1
all_vram_visible = 1
```
OH BOI THE POWER

[White Wolf]

After executing AMD_DEBUG=info glxinfo command I found that:
vram_size = 8192 MB
vram_vis_size = 8176 MB
vram_type = 9
vram_bit_width = 256
has_dedicated_vram = 1
all_vram_visible = 1

but there is also info:
smart_access_memory = 0

anyone knows what does it means? I have SAM enabled in bios.

[Melcar]

After executing AMD_DEBUG=info glxinfo command I found that:
vram_size = 8192 MB
vram_vis_size = 8176 MB
vram_type = 9
vram_bit_width = 256
has_dedicated_vram = 1
all_vram_visible = 1

but there is also info:
smart_access_memory = 0

anyone knows what does it means? I have SAM enabled in bios.

I get the same on my RX 480 and X370 board.

[Entzilla]

Hi,

Can you run this command and post the output if vram_vis_size is greater than 256 MB? It means that Smart Access Memory is enabled. I'd like to see what numbers you get.

AMD_DEBUG=info glxinfo | grep vram
Thanks.

$ AMD_DEBUG=info glxinfo | grep vram
vram_size = 16384 MB
vram_vis_size = 16368 MB
vram_type = 9
vram_bit_width = 256
has_dedicated_vram = 1
all_vram_visible = 1

(6800xt, 5950x, x570)

[White Wolf]

$ AMD_DEBUG=info glxinfo | grep vram
vram_size = 16384 MB
vram_vis_size = 16368 MB
vram_type = 9
vram_bit_width = 256
has_dedicated_vram = 1
all_vram_visible = 1

(6800xt, 5950x, x570)

could you run

AMD_DEBUG=info glxinfo | grep smart

and paste the result please?

[Entzilla]

could you run

AMD_DEBUG=info glxinfo | grep smart

and paste the result please?

SAM turns out with a 0

 smart_access_memory = 0

, but checking dmesg I get:

[    1.051160] [drm] Detected VRAM RAM=16368M, BAR=16384M

So it seems to register?

Edit: This using Manjaro and 5.14.2.1 kernel, and open source drivers

[agd5f]

The kernel driver will always resize the BAR if possible. Mesa has additional optimizations.

[White Wolf]

Thanks all for help! So it looks like my SAM works properly.