From: "Žilvinas Žaltiena" <zilvinas@natrix.lt>
To: yazen.ghannam@amd.com
Cc: bp@alien8.de, linux-edac@vger.kernel.org, mailinglist@reox.at
Subject: Re: Memory controller not showing half of the memory?
Date: Thu, 20 Mar 2025 11:38:58 +0200 [thread overview]
Message-ID: <dbec22b6-00f2-498b-b70d-ab6f8a5ec87e@natrix.lt> (raw)
In-Reply-To: <20250317120702.GA7066@yaz-khff2.amd.com>
Hello,
I am also having this "half" memory problem - EDAC is showing 48GB
instead of 96GB, however otherwise whole 96GB are usable by OS.
My system has:
1) AMD Ryzen 7950X3D
2) Asus B650 Pro Creator motherboard (AGESA is PI 1.2.0.3a Patch A)
3) 2x48GB ECC UDIMMs (KSM56E46BD8KM-48HM
https://www.kingston.com/datasheets/KSM56E46BD8KM-48HM.pdf)
Kernel 6.13.6 is showing:
[ 0.325894] [ T1] EDAC MC: Ver: 3.0.0
[ 9.521853] [ T1336] EDAC MC0: Giving out device to module
amd64_edac controller F19h_M60h: DEV 0000:00:18.3 (INTERRUPT)
[ 9.521856] [ T1336] EDAC amd64: F19h_M60h detected (node 0).
[ 9.521857] [ T1336] EDAC MC: UMC0 chip selects:
[ 9.521858] [ T1336] EDAC amd64: MC: 0: 0MB 1: 0MB
[ 9.521859] [ T1336] EDAC amd64: MC: 2: 16384MB 3: 8192MB
[ 9.521860] [ T1336] EDAC MC: UMC1 chip selects:
[ 9.521861] [ T1336] EDAC amd64: MC: 0: 0MB 1: 0MB
[ 9.521862] [ T1336] EDAC amd64: MC: 2: 16384MB 3: 8192MB
or in summary:
UMC0: MC0=0GB, MC1=0GB, MC2=16GB, MC3=8GB
UMC1: MC0=0GB, MC1=0GB, MC2=16GB, MC3=8GB
I also has access to different system with AMD Ryzen 7950X and 2x32GB
ECC UDIMMs, and it does NOT have this half ram problem, i.e. EDAC shows
in summary:
UMC0: MC0=0GB, MC1=0GB, MC2=16GB, MC3=16GB
UMC1: MC0=0GB, MC1=0GB, MC2=16GB, MC3=16GB
RAM is Kingston KSM52E42BD8KM-32HA
(https://www.kingston.com/datasheets/KSM52E42BD8KM-32HA.pdf) in it.
next prev parent reply other threads:[~2025-03-20 9:41 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-13 17:21 Memory controller not showing half of the memory? reox
2025-03-13 17:31 ` Borislav Petkov
2025-03-13 17:48 ` reox
2025-03-17 12:07 ` Yazen Ghannam
2025-03-17 12:37 ` reox
2025-03-20 9:38 ` Žilvinas Žaltiena [this message]
2025-03-28 15:24 ` Borislav Petkov
2025-03-30 8:25 ` Žilvinas
2025-03-30 10:39 ` Borislav Petkov
2025-03-30 11:00 ` Žilvinas Žaltiena
2025-04-01 11:44 ` mailinglist
2025-04-01 18:00 ` Naik, Avadhut
2025-07-24 17:47 ` mailinglist
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