Upgraded RAM, It get's detected but not used. Any ideas?

[sir_alex_leo]

Originally I had 32GB RAM when I installed XCP-NG
Now that I added 2 additional sticks to the system, the OS doesn't pick it up.
dmidecode sees those sticks. If I disable SR-IOV, the RAM is usable.
But I need to pass a PCI-e card to a VM so I can't run it disabled.
On XCP-ng 8.2.1 currently. With Legacy boot.

Any ideas how to fix it? I even tried to tape the card Pin 5 and 6 on the Raid card, but there's no difference.
Is it just limitation of the Motherboard? Or the CPU itself? I rmember early Ryzen days Ryzen had memory issues.
Or a Hardware bug?

[15:24 xcp-ng-home ~]# dmidecode -t system
# dmidecode 3.0
Getting SMBIOS data from sysfs.
SMBIOS 3.3.0 present.
# SMBIOS implementations newer than version 3.0 are not
# fully supported by this version of dmidecode.

Handle 0x0001, DMI type 1, 27 bytes
System Information
        Manufacturer: To Be Filled By O.E.M.
        Product Name: To Be Filled By O.E.M.
        Version: To Be Filled By O.E.M.
        Serial Number: To Be Filled By O.E.M.
        UUID: C7C28570-A2BE-0000-0000-000000000000
        Wake-up Type: Power Switch
        SKU Number: To Be Filled By O.E.M.
        Family: To Be Filled By O.E.M.

Handle 0x000B, DMI type 32, 20 bytes
System Boot Information
        Status: No errors detected

[15:33 xcp-ng-home ~]# dmidecode -t baseboard
# dmidecode 3.0
Getting SMBIOS data from sysfs.
SMBIOS 3.3.0 present.
# SMBIOS implementations newer than version 3.0 are not
# fully supported by this version of dmidecode.

Handle 0x0002, DMI type 2, 15 bytes
Base Board Information
        Manufacturer: ASRock
        Product Name: X470 Taichi Ultimate
        Version:
        Serial Number:
        Asset Tag:
        Features:
                Board is a hosting board
                Board is replaceable
        Location In Chassis:
        Chassis Handle: 0x0003
        Type: Motherboard
        Contained Object Handles: 0

[15:33 xcp-ng-home ~]# dmidecode -t memory
# dmidecode 3.0
Getting SMBIOS data from sysfs.
SMBIOS 3.3.0 present.
# SMBIOS implementations newer than version 3.0 are not
# fully supported by this version of dmidecode.

Handle 0x0010, DMI type 16, 23 bytes
Physical Memory Array
        Location: System Board Or Motherboard
        Use: System Memory
        Error Correction Type: None
        Maximum Capacity: 128 GB
        Error Information Handle: 0x000F
        Number Of Devices: 4

Handle 0x0017, DMI type 17, 92 bytes
Memory Device
        Array Handle: 0x0010
        Error Information Handle: 0x0016
        Total Width: 128 bits
        Data Width: 64 bits
        Size: 16384 MB
        Form Factor: DIMM
        Set: None
        Locator: DIMM 0
        Bank Locator: P0 CHANNEL A
        Type: DDR4
        Type Detail: Synchronous Unbuffered (Unregistered)
        Speed: 2667 MHz
        Manufacturer: Kingston
        Serial Number: 247EACAF
        Asset Tag: Not Specified
        Part Number: 9965745-002.A00G
        Rank: 2
        Configured Clock Speed: 2667 MHz
        Minimum Voltage: 1.2 V
        Maximum Voltage: 1.2 V
        Configured Voltage: 1.2 V

Handle 0x001A, DMI type 17, 92 bytes
Memory Device
        Array Handle: 0x0010
        Error Information Handle: 0x0019
        Total Width: 64 bits
        Data Width: 64 bits
        Size: 16384 MB
        Form Factor: DIMM
        Set: None
        Locator: DIMM 1
        Bank Locator: P0 CHANNEL A
        Type: DDR4
        Type Detail: Synchronous Unbuffered (Unregistered)
        Speed: 2667 MHz
        Manufacturer: Unknown
        Serial Number: 00159130
        Asset Tag: Not Specified
        Part Number: Unknown
        Rank: 2
        Configured Clock Speed: 2667 MHz
        Minimum Voltage: 1.2 V
        Maximum Voltage: 1.2 V
        Configured Voltage: 1.2 V

Handle 0x001D, DMI type 17, 92 bytes
Memory Device
        Array Handle: 0x0010
        Error Information Handle: 0x001C
        Total Width: 128 bits
        Data Width: 64 bits
        Size: 16384 MB
        Form Factor: DIMM
        Set: None
        Locator: DIMM 0
        Bank Locator: P0 CHANNEL B
        Type: DDR4
        Type Detail: Synchronous Unbuffered (Unregistered)
        Speed: 2667 MHz
        Manufacturer: Kingston
        Serial Number: 1E7EB212
        Asset Tag: Not Specified
        Part Number: 9965745-002.A00G
        Rank: 2
        Configured Clock Speed: 2667 MHz
        Minimum Voltage: 1.2 V
        Maximum Voltage: 1.2 V
        Configured Voltage: 1.2 V

Handle 0x0020, DMI type 17, 92 bytes
Memory Device
        Array Handle: 0x0010
        Error Information Handle: 0x001F
        Total Width: 64 bits
        Data Width: 64 bits
        Size: 16384 MB
        Form Factor: DIMM
        Set: None
        Locator: DIMM 1
        Bank Locator: P0 CHANNEL B
        Type: DDR4
        Type Detail: Synchronous Unbuffered (Unregistered)
        Speed: 2667 MHz
        Manufacturer: Unknown
        Serial Number: 0015913F
        Asset Tag: Not Specified
        Part Number: Unknown
        Rank: 2
        Configured Clock Speed: 2667 MHz
        Minimum Voltage: 1.2 V
        Maximum Voltage: 1.2 V
        Configured Voltage: 1.2 V

[15:33 xcp-ng-home ~]# xe host-cpu-info
cpu_count            : 16
         socket_count: 1
               vendor: AuthenticAMD
                speed: 3700.264
            modelname: AMD Ryzen 7 2700X Eight-Core Processor
               family: 23
                model: 8
             stepping: 2
                flags: fpu de tsc msr pae mce cx8 apic mca cmov pat clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt rdtscp lm constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid pni pclmulqdq ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm cmp_legacy abm sse4a misalignsse 3dnowprefetch bpext ssbd ibpb vmmcall fsgsbase bmi1 avx2 bmi2 rdseed adx clflushopt sha_ni xsaveopt xsavec xgetbv1 clzero xsaveerptr arat
             features: 7ed8320b-178bfbff-35c233ff-2fd3fbff
          features_pv: 1789c3f5-f6f83203-2bd1cbf5-040001e3-00000007-208c0129-00000000-00000000-00001005-00000000-00000000-00000000-00000000-00000000-00000000-00000000-00000000-00000000
         features_hvm: 178bfbff-f6f83203-2fd3fbff-040085f7-0000000f-209c01a9-00000000-00000000-00001005-00000000-00000000-00000000-00000000-00000000-00000000-00000000-00000000-00000000
    features_hvm_host: 178bfbff-f6d83203-2e500800-040001f7-0000000f-209c01a9-00000000-00000000-00001005-00000000-00000000-00000000-00000000-00000000-00000000-00000000-00000000-00000000
     features_pv_host: 1789c3f5-f6d83203-2a500800-040001e3-00000007-208c0129-00000000-00000000-00001005-00000000-00000000-00000000-00000000-00000000-00000000-00000000-00000000-00000000

[olivierlambert]

Hi,

What do you mean by "the OS doesn't pick it up"? Are you talking about the Dom0? You should check available memory with xl info which is the memory of the whole host, not just the Dom0.