Public bug reported:
Platform: Cavium Sabre Marvell ThunderX2
The L1/L2/L3 cache output by "lscpu" is incorrect, and differes from the
output with bionic.
[Steps to Reproduce]
1. Install ubuntu server (focal) on Sabre
2. lspci
[Expected Result]
L1d cache: 32K
L1i cache: 32K
L2 cache: 256K
L3 cache: 32768K
[Actual Result]
L1d cache: 1.8 MiB
L1i cache: 1.8 MiB
L2 cache: 14 MiB
L3 cache: 64 MiB
[More Information]
1. eoan could reproduce this issue.
2. bionic-hwe could not reproduce this issue (5.3.0-46-generic
#38~18.04.1-Ubuntu)
3. with focal, check the cpu cache directly from the virtual devices and the
cache information looks good:
$ cat /sys/devices/system/cpu/cpu0/cache/index0/level
/sys/devices/system/cpu/cpu0/cache/index0/size
1
32K
4. More information about the system which could reproduce the issue:
ubuntu@apollo:~$ cat /sys/devices/system/cpu/cpu0/cache/index0/level
/sys/devices/system/cpu/cpu0/cache/index0/size
1
32K
ubuntu@apollo:~$ uname -a
Linux apollo 5.4.0-24-generic #28-Ubuntu SMP Thu Apr 9 22:17:51 UTC 2020
aarch64 aarch64 aarch64 GNU/Linux
ubuntu@apollo:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu Focal Fossa (development branch)
Release: 20.04
Codename: focal
ubuntu@apollo:~$ dpkg -l util-linux
Desired=Unknown/Install/Remove/Purge/Hold
|
Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-==============-===============-============-=================================
ii util-linux 2.34-0.1ubuntu9 arm64 miscellaneous system
utilities
ubuntu@apollo:~$
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: util-linux 2.34-0.1ubuntu9
ProcVersionSignature: User Name 5.4.0-24.28-generic 5.4.30
Uname: Linux 5.4.0-24-generic aarch64
ApportVersion: 2.20.11-0ubuntu26
Architecture: arm64
CasperMD5CheckResult: skip
Date: Fri Apr 17 16:00:13 2020
SourcePackage: util-linux
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: util-linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug arm64 focal uec-images
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https://bugs.launchpad.net/bugs/1873489
Title:
lscpu cache information is incorrect with focal on arm 64-bit platform
(ThunderX2)
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