+++ /dev/null
-SUT Settings - Linux
---------------------
-
-System provisioning is done by combination of PXE boot unattented
-install and
-`Ansible <https://www.ansible.com>`_ described in `CSIT Testbed Setup`_.
-
-Below a subset of the running configuration:
-
-1. Xeon Haswell - Ubuntu 16.04.1 LTS
-
-::
-
- $ lsb_release -a
- No LSB modules are available.
- Distributor ID: Ubuntu
- Description: Ubuntu 16.04.1 LTS
- Release: 16.04
- Codename: xenial
-
-2. Xeon Skylake - Ubuntu 18.04 LTS
-
-::
-
- $ lsb_release -a
- No LSB modules are available.
- Distributor ID: Ubuntu
- Description: Ubuntu 18.04 LTS
- Release: 18.04
- Codename: bionic
-
-Linux Boot Parameters
-~~~~~~~~~~~~~~~~~~~~~
-
-- **isolcpus=<cpu number>-<cpu number>** used for all cpu cores apart from
- first core of each socket used for running VPP worker threads and Qemu/LXC
- processes
- https://www.kernel.org/doc/Documentation/admin-guide/kernel-parameters.txt
-- **intel_pstate=disable** - [X86] Do not enable intel_pstate as the default
- scaling driver for the supported processors. Intel P-State driver decide what
- P-state (CPU core power state) to use based on requesting policy from the
- cpufreq core. [X86 - Either 32-bit or 64-bit x86]
- https://www.kernel.org/doc/Documentation/cpu-freq/intel-pstate.txt
-- **nohz_full=<cpu number>-<cpu number>** - [KNL,BOOT] In kernels built with
- CONFIG_NO_HZ_FULL=y, set the specified list of CPUs whose tick will be stopped
- whenever possible. The boot CPU will be forced outside the range to maintain
- the timekeeping. The CPUs in this range must also be included in the
- rcu_nocbs= set. Specifies the adaptive-ticks CPU cores, causing kernel to
- avoid sending scheduling-clock interrupts to listed cores as long as they have
- a single runnable task. [KNL - Is a kernel start-up parameter, SMP - The
- kernel is an SMP kernel].
- https://www.kernel.org/doc/Documentation/timers/NO_HZ.txt
-- **rcu_nocbs** - [KNL] In kernels built with CONFIG_RCU_NOCB_CPU=y, set the
- specified list of CPUs to be no-callback CPUs, that never queue RCU callbacks
- (read-copy update).
- https://www.kernel.org/doc/Documentation/admin-guide/kernel-parameters.txt
-- **numa_balancing=disable** - [KNL,X86] Disable automatic NUMA balancing.
-- **intel_iommu=enable** - [DMAR] Enable Intel IOMMU driver (DMAR) option.
-- **iommu=on, iommu=pt** - [x86, IA-64] Disable IOMMU bypass, using IOMMU for
- PCI devices.
-- **nmi_watchdog=0** - [KNL,BUGS=X86] Debugging features for SMP kernels. Turn
- hardlockup detector in nmi_watchdog off.
-- **nosoftlockup** - [KNL] Disable the soft-lockup detector.
-- **tsc=reliable** - Disable clocksource stability checks for TSC.
- [x86] reliable: mark tsc clocksource as reliable, this disables clocksource
- verification at runtime, as well as the stability checks done at bootup.
- Used to enable high-resolution timer mode on older hardware, and in
- virtualized environment.
-- **hpet=disable** - [X86-32,HPET] Disable HPET and use PIT instead.
-
-Applied Boot Cmdline
-~~~~~~~~~~~~~~~~~~~~
-
-1. Xeon Haswell - Ubuntu 16.04.1 LTS
-
-::
-
- $ cat /proc/cmdline
- BOOT_IMAGE=/vmlinuz-4.4.0-72-generic root=UUID=35ea11e4-e44f-4f67-8cbe-12f09c49ed90 ro isolcpus=1-17,19-35 nohz_full=1-17,19-35 rcu_nocbs=1-17,19-35 intel_pstate=disable console=tty0 console=ttyS0,115200n8
-
-2. Xeon Skylake - Ubuntu 18.04 LTS
-
-::
-
- $ cat /proc/cmdline
- BOOT_IMAGE=/vmlinuz-4.15.0-23-generic root=UUID=3fa246fd-1b80-4361-bb90-f339a6bbed51 ro isolcpus=1-27,29-55,57-83,85-111 nohz_full=1-27,29-55,57-83,85-111 rcu_nocbs=1-27,29-55,57-83,85-111 numa_balancing=disable intel_pstate=disable intel_iommu=on iommu=pt nmi_watchdog=0 audit=0 nosoftlockup processor.max_cstate=1 intel_idle.max_cstate=1 hpet=disable tsc=reliable mce=off console=tty0 console=ttyS0,115200n8
-
-
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