PC Graphics

theminingking · ‎01-31-2018

Something seems off...

if I execute:

ethminer -G --list-devices

It reports:

    [0] [0] Ellesmere 
        CL_DEVICE_TYPE: GPU
        CL_DEVICE_GLOBAL_MEM_SIZE: 5975805952
        CL_DEVICE_MAX_MEM_ALLOC_SIZE: 4244635648 
        CL_DEVICE_MAX_WORK_GROUP_SIZE: 256

Similarly,

/opt/amdgpu-pro/bin/clinfo

reports

... Global memory size: 5975805952 Constant buffer size: 4244635648 ...

These cards are supposed to have 8GB of onboard memory. I'd expect something like this:

CL_DEVICE_GLOBAL_MEM_SIZE: 8451543040

Any insight?

Ubuntu 16.04
AMDGPU-PRO 17.40

meister_rm · ‎02-01-2018

Have you checked on another application to see the reporting size? I would use GPU-Z or similar program and see what it reports.

theminingking · ‎02-02-2018

I don't know about `gpu-z` on Ubuntu, but I did try a few things:

sudo lspci -v -s 01:00.0

Reports

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Device 67df (rev e7) (prog-if 00 [VGA controller])

Subsystem: ASUSTeK Computer Inc. Device 0521

Flags: bus master, fast devsel, latency 0, IRQ 16

Memory at c0000000 (64-bit, prefetchable) [size=256M]

Memory at d0000000 (64-bit, prefetchable) [size=2M]

I/O ports at e000 [size=256]

Memory at dfe00000 (32-bit, non-prefetchable) [size=256K]

Expansion ROM at 000c0000 [disabled] [size=128K]

Capabilities: [48] Vendor Specific Information: Len=08 <?>

Capabilities: [50] Power Management version 3

Capabilities: [58] Express Legacy Endpoint, MSI 00

Capabilities: [a0] MSI: Enable- Count=1/1 Maskable- 64bit+

Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>

Capabilities: [150] Advanced Error Reporting

Capabilities: [200] #15

Capabilities: [270] #19

Capabilities: [2b0] Address Translation Service (ATS)

Capabilities: [2c0] #13

Capabilities: [2d0] #1b

Capabilities: [320] Latency Tolerance Reporting

Capabilities: [328] Alternative Routing-ID Interpretation (ARI)

Capabilities: [370] L1 PM Substates

Kernel driver in use: amdgpu

Kernel modules: amdgpu

`sudo lshw -class display` reports similar information, except in hex.

Interestingly,

sudo dmesg | grep drm

Reports

[ 9.252075] [drm] amdgpu: 8192M of VRAM memory ready

[ 9.252075] [drm] amdgpu: 8192M of GTT memory ready.

This post describes a similar problem:

amd graphics - RX 580 8GB not using more than 2GB memory - Ask Ubuntu

But of course in his case, he's only getting use out of 2GB while I'm getting 6GB.

PC Graphics

8GB RX580 Global Memory Size reports only 6GB??