Not all RAM usable in ACRN user VM
|
c.susen@...
Hi everyone,
I am probably making some kind of stupid mistake but cannot figure out the problem. Therefore, I would really appreciate if someone could give me a hint on how to proceed. I upgraded the PC that I use to run the ACRN hypervisor from 8 GB of RAM to 40 GB of RAM by adding two 16 GB bars (previously I had two 4 GB bars). When I use the generic Ubuntu kernel, everything works without problems and the memory is recognized and usable. However, when I use the ACRN kernel (version 2.6), and run the "free" command, only 16 GB of the memory are shown. When running "sudo lshw | grep -A 9 bank", all four bars are shown correctly as you can see below. *-bank:0
description: DIMM DDR4 Synchronous 2666 MHz (0.4 ns)
product: HMA851U6CJR6N-VK
vendor: Hynix Semiconductor (Hyundai Electronics)
physical id: 0
serial: 2E9F46C3
slot: DIMM1
size: 4GiB
width: 64 bits
clock: 2666MHz (0.4ns)
*-bank:1
description: DIMM DDR4 Synchronous 2666 MHz (0.4 ns)
product: HMA851U6CJR6N-VK
vendor: Hynix Semiconductor (Hyundai Electronics)
physical id: 1
serial: 2E9F47C5
slot: DIMM2
size: 4GiB
width: 64 bits
clock: 2666MHz (0.4ns)
*-bank:2
description: DIMM DDR4 Synchronous 2666 MHz (0.4 ns)
product: 9905734-073.A00G
vendor: AMD
physical id: 2
serial: 2AAB4317
slot: DIMM3
size: 16GiB
width: 64 bits
clock: 2666MHz (0.4ns)
*-bank:3
description: DIMM DDR4 Synchronous 2666 MHz (0.4 ns)
product: 9905734-073.A00G
vendor: AMD
physical id: 3
serial: F36B433B
slot: DIMM4
size: 16GiB
width: 64 bits
clock: 2666MHz (0.4ns)
So far I only created a new board configuration file and recompiled kernel and hypervisor. Apart from that, I did not make any change to the system and installation except for adding the two RAM bars. Thanks in advance for your help! Best regards, Christoph |
|
|
|
Liu, Fuzhong
Hi Christoph Do you re-generate the board.xml and scenario.xml after adding two more 16 GB bars? Please check following setting in scenario.xml:
<PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
This value is for 16G memory, please update it to 0x900000000 and build ACRN again.
Thanks!
BR. Fuzhong
From: acrn-users@... <acrn-users@...>
On Behalf Of c.susen@...
Sent: Thursday, February 17, 2022 12:03 AM To: acrn-users@... Subject: [acrn-users] Not all RAM usable in ACRN user VM
Hi everyone,
*-bank:0 description: DIMM DDR4 Synchronous 2666 MHz (0.4 ns) product: HMA851U6CJR6N-VK vendor: Hynix Semiconductor (Hyundai Electronics) physical id: 0 serial: 2E9F46C3 slot: DIMM1 size: 4GiB width: 64 bits clock: 2666MHz (0.4ns) *-bank:1 description: DIMM DDR4 Synchronous 2666 MHz (0.4 ns) product: HMA851U6CJR6N-VK vendor: Hynix Semiconductor (Hyundai Electronics) physical id: 1 serial: 2E9F47C5 slot: DIMM2 size: 4GiB width: 64 bits clock: 2666MHz (0.4ns) *-bank:2 description: DIMM DDR4 Synchronous 2666 MHz (0.4 ns) product: 9905734-073.A00G vendor: AMD physical id: 2 serial: 2AAB4317 slot: DIMM3 size: 16GiB width: 64 bits clock: 2666MHz (0.4ns) *-bank:3 description: DIMM DDR4 Synchronous 2666 MHz (0.4 ns) product: 9905734-073.A00G vendor: AMD physical id: 3 serial: F36B433B slot: DIMM4 size: 16GiB width: 64 bits clock: 2666MHz (0.4ns) |
|
|