Public bug reported:
For NVIDIA Orin Nano, L3 all cache size is 4M. But we got different
result via lscpu comes from different version of util-linux:
lscpu from util-linux 2.34 which is the default version in Ubuntu focal
(20.04) and shows wrong information:
# lscpu -C // lscpu bin from util-linux 2.34
NAME ONE-SIZE ALL-SIZE WAYS TYPE LEVEL
L1d 64K 384K 4 Data 1
L1i 64K 384K 4 Instruction 1
L2 256K 1.5M 8 Unified 2
L3 2M 2M 16 Unified 3
# lscpu
L1d cache: 384 KiB
L1i cache: 384 KiB
L2 cache: 1.5 MiB
L3 cache: 2 MiB
lscpu from util-linux 2.39 shows correct information, and this version
is only packaged for Ubuntu mantic (23.10):
# lscpu -C // lscpu bin from util-linux 2.39
NAME ONE-SIZE ALL-SIZE WAYS TYPE LEVEL SETS PHY-LINE COHERENCY-SIZE
L1d 64K 384K 4 Data 1 256 64
L1i 64K 384K 4 Instruction 1 256 64
L2 256K 1.5M 8 Unified 2 512 64
L3 2M 4M 16 Unified 3 2048 64
# lscpu
Caches (sum of all):
L1d: 384 KiB (6 instances)
L1i: 384 KiB (6 instances)
L2: 1.5 MiB (6 instances)
L3: 4 MiB (2 instances)
Looks like there was a fix during version 2.34 to 2.39, but we need to
use Ubuntu 20.04. Can you please backport the fix change to 2.34 then we
can get correct information using default lscpu for Ubuntu 20.04?
** Affects: util-linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2041779
Title:
lscpu shows wrong L3 Cache size on NVIDIA Orin Nano
Status in util-linux package in Ubuntu:
New
Bug description:
For NVIDIA Orin Nano, L3 all cache size is 4M. But we got different
result via lscpu comes from different version of util-linux:
lscpu from util-linux 2.34 which is the default version in Ubuntu
focal (20.04) and shows wrong information:
# lscpu -C // lscpu bin from util-linux 2.34
NAME ONE-SIZE ALL-SIZE WAYS TYPE LEVEL
L1d 64K 384K 4 Data 1
L1i 64K 384K 4 Instruction 1
L2 256K 1.5M 8 Unified 2
L3 2M 2M 16 Unified 3
# lscpu
L1d cache: 384 KiB
L1i cache: 384 KiB
L2 cache: 1.5 MiB
L3 cache: 2 MiB
lscpu from util-linux 2.39 shows correct information, and this version
is only packaged for Ubuntu mantic (23.10):
# lscpu -C // lscpu bin from util-linux 2.39
NAME ONE-SIZE ALL-SIZE WAYS TYPE LEVEL SETS PHY-LINE COHERENCY-SIZE
L1d 64K 384K 4 Data 1 256 64
L1i 64K 384K 4 Instruction 1 256 64
L2 256K 1.5M 8 Unified 2 512 64
L3 2M 4M 16 Unified 3 2048 64
# lscpu
Caches (sum of all):
L1d: 384 KiB (6 instances)
L1i: 384 KiB (6 instances)
L2: 1.5 MiB (6 instances)
L3: 4 MiB (2 instances)
Looks like there was a fix during version 2.34 to 2.39, but we need to
use Ubuntu 20.04. Can you please backport the fix change to 2.34 then
we can get correct information using default lscpu for Ubuntu 20.04?
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