* Can't disable local timer interrupts on the isolated core
@ 2018-11-15 10:32 Mohsen Alizadeh Noghani
0 siblings, 0 replies; only message in thread
From: Mohsen Alizadeh Noghani @ 2018-11-15 10:32 UTC (permalink / raw)
To: linux-rt-users
Hello everyone.
I'm using 4.4.162-rt175 and a core i3-4170 processor. I would like my
only real-time process (1 thread) to run on an isolated core, without
interruptions by the local timer.
* Support for fully tickless opration is enabled in the kernel configuration
CONFIG_NO_HZ_FULL=y
* Kernel boot parameters for isolating CPU 1,
isolcpus=1 nohz=on nohz_full=1 rcu_nocbs=1
However, even when I haven't assigned any process to CPU 1, it's being
interrupted by the timer tick at a rate of 1 KHz (HZ_1000=y), as seen
in the output of
cat /proc/interrupts
1- Is there something I'm missing in the configuration or boot parameters?
2- If tickless operation is not possible, what is the second-best
combination of timer tick handling and timer frequency configurations?
Is "Periodic timer ticks" preferable to "Idle dynticks system"? Is a
lower timer frequency better as the only process on the isolated CPU
gets interrupted less?
Best,
Mohsen
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2018-11-15 20:39 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-11-15 10:32 Can't disable local timer interrupts on the isolated core Mohsen Alizadeh Noghani
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).