Built kernel with patches that fix CPPC issues, and re-run the test. == Enable CPPC control in firmware ==
CAVM_CN99xx# env set cppccontrol 1 == Bionic kernel with patches == ubuntu@starbuck:~$ uname -a Linux starbuck 4.15.0-38-generic #41~lp1796949+build.1 SMP Tue Oct 16 17:06:56 UTC 2018 aarch64 aarch64 aarch64 GNU/Linux ubuntu@starbuck:~$ ls -lR /sys/devices/system/cpu/cpu1/acpi_cppc/ /sys/devices/system/cpu/cpu1/acpi_cppc/: total 0 -r--r--r-- 1 root root 4096 Oct 16 18:45 feedback_ctrs -r--r--r-- 1 root root 4096 Oct 16 18:45 highest_perf -r--r--r-- 1 root root 4096 Oct 16 18:45 lowest_nonlinear_perf -r--r--r-- 1 root root 4096 Oct 16 18:45 lowest_perf -r--r--r-- 1 root root 4096 Oct 16 18:45 nominal_perf -r--r--r-- 1 root root 4096 Oct 16 18:45 reference_perf -r--r--r-- 1 root root 4096 Oct 16 18:45 wraparound_time ubuntu@starbuck:~$ cat /sys/devices/system/cpu/cpu1/acpi_cppc/highest_perf 2500000 ubuntu@starbuck:~$ cat /sys/devices/system/cpu/cpu1/acpi_cppc/lowest_perf 1000000 ubuntu@starbuck:~$ cat /sys/devices/system/cpu/cpu1/acpi_cppc/feedback_ctrs ref:2240139584 del:2315092606 ubuntu@starbuck:~$ -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1796949 Title: [Bionic] CPPC bug fixes Status in linux package in Ubuntu: Incomplete Bug description: [Impact] A number of CPPC related fixes from upstream needed for Cavium ThunderX2 systems. [Fix] 58e1c03536c9 ACPI / CPPC: Fix invalid PCC channel status errors b8b10bc2015c cpufreq: CPPC: Don't set transition_latency d29abc836843 ACPI / CPPC: Update all pr_(debug/err) messages to log the susbspace id [Test] A test kernel is available in ppa:yarmouth-team/cppc-tx2. This kernel was successfully tested on a CN99XX system. [Regression Potential] The cppcontrol feature needs to be explicitly enabled in firmware (default is disabled) for these patches to be in effect. Risk of regression is low. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1796949/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
