On Wed, May 18, 2022 at 1:30 AM <pbhagavat...@marvell.com> wrote: > > From: Pavan Nikhilesh <pbhagavat...@marvell.com> > > Update Linux core isolation guide to include isolation from > timers, rcu processing and IRQs.
rcu-> RCU > > Signed-off-by: Pavan Nikhilesh <pbhagavat...@marvell.com> Acked-by: Jerin Jacob <jer...@marvell.com> > --- > v3 Changes: > - Add additional information links for Cgroups. > v2 Changes: > - Add references to the parameters used. > - Add note about Linux cgroups. > > doc/guides/linux_gsg/enable_func.rst | 35 ++++++++++++++++++++++++---- > 1 file changed, 30 insertions(+), 5 deletions(-) > > diff --git a/doc/guides/linux_gsg/enable_func.rst > b/doc/guides/linux_gsg/enable_func.rst > index 1df3ab0255..c989674422 100644 > --- a/doc/guides/linux_gsg/enable_func.rst > +++ b/doc/guides/linux_gsg/enable_func.rst > @@ -90,16 +90,41 @@ Using Linux Core Isolation to Reduce Context Switches > ----------------------------------------------------- > > While the threads used by a DPDK application are pinned to logical cores on > the system, > -it is possible for the Linux scheduler to run other tasks on those cores > also. > -To help prevent additional workloads from running on those cores, > -it is possible to use the ``isolcpus`` Linux kernel parameter to isolate > them from the general Linux scheduler. > +it is possible for the Linux scheduler to run other tasks on those cores. > +To help prevent additional workloads, timers, rcu processing and IRQs from > running on those cores, it is possible to use > +the Linux kernel parameters ``isolcpus``, ``nohz_full``, ``irqaffinity`` to > isolate them from the general Linux scheduler tasks. > > -For example, if DPDK applications are to run on logical cores 2, 4 and 6, > +For example, if a given CPU has 0-7 cores and DPDK applications are to run > on logical cores 2, 4 and 6, > the following should be added to the kernel parameter list: > > .. code-block:: console > > - isolcpus=2,4,6 > + isolcpus=2,4,6 nohz_full=2,4,6 irqaffinity=0,1,3,5,7 > + > +.. Note:: > + > + More detailed information about the above parameters can be found at > + https://www.kernel.org/doc/html/latest/timers/no_hz.html > + https://www.kernel.org/doc/html/latest/core-api/irq/ > + > https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html > + > + > +For more fine grained control over resource management and performance > tuning one can look > +into ``Linux cgroups``. > + > +Cpusets using cgroups:: > + > + https://www.kernel.org/doc/html/latest/admin-guide/cgroup-v1/cpusets.html > + > +Systemd (CPUAffinity):: > + > + https://www.freedesktop.org/software/systemd/man/systemd.exec.html > + > +Also, see:: > + > + https://man7.org/linux/man-pages/man7/cpuset.7.html > + https://www.suse.com/c/cpu-isolation-practical-example-part-5/ > + https://www.rcannings.com/systemd-core-isolation/ > > .. _High_Precision_Event_Timer: > > -- > 2.25.1 >
