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doc: simplify Linux paramter rcu_nocbs in PVP benchmark

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From Documentation/admin-guide/kernel-parameters.txt, specifically the
last sentence:

 nohz_full=      [KNL,BOOT,SMP,ISOL]
        The argument is a cpu list, as described above.
        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.  Any CPUs
        in this list will have their RCU callbacks offloaded,
        just as if they had also been called out in the
        rcu_nocbs= boot parameter.

The kernel or-s the nohz_full cpumask into the rcu_nocbs cpumask at
startup, and uses that.

Signed-off-by: Tudor Brindus <me@tbrindus.ca>
This commit is contained in:
Tudor Brindus 2022-02-07 22:50:18 -05:00 committed by Thomas Monjalon
parent ba4132c5a4
commit 959c84ed05
1 changed files with 2 additions and 2 deletions
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4
doc/guides/howto/pvp_reference_benchmark.rst
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@ -48,7 +48,7 @@ Host tuning
.. code-block:: console .. code-block:: console
intel_pstate=disable mce=ignore_ce default_hugepagesz=1G hugepagesz=1G hugepages=6 isolcpus=2-7 rcu_nocbs=2-7 nohz_full=2-7 iommu=pt intel_iommu=on intel_pstate=disable mce=ignore_ce default_hugepagesz=1G hugepagesz=1G hugepages=6 isolcpus=2-7 nohz_full=2-7 iommu=pt intel_iommu=on
#. Disable hyper-threads at runtime if necessary or if BIOS is not accessible: #. Disable hyper-threads at runtime if necessary or if BIOS is not accessible:
@ -278,7 +278,7 @@ Guest tuning
.. code-block:: console .. code-block:: console
default_hugepagesz=1G hugepagesz=1G hugepages=1 intel_iommu=on iommu=pt isolcpus=1,2 rcu_nocbs=1,2 nohz_full=1,2 default_hugepagesz=1G hugepagesz=1G hugepages=1 intel_iommu=on iommu=pt isolcpus=1,2 nohz_full=1,2
#. Disable NMIs: #. Disable NMIs: