C-Docs: New structure

[csit.git] / docs / report / introduction / environment / sut_conf_1.rst

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-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`_.
-
-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.
-
-Hugepages Configuration
-~~~~~~~~~~~~~~~~~~~~~~~
-
-Huge pages are managed via sysctl configuration located in
-`/etc/sysctl.d/90-csit.conf` on each testbed. Default huge page size is 2M.
-The exact amount of huge pages depends on testbed. All the values are defined
-in `Ansible inventory - hosts` files.