Hi all,
On Wed, Jul 24, 2024 at 4:46 PM Leon Woestenberg <leon@xxxxxxxxxxxxxx> wrote:
> On Wed, Jul 24, 2024 at 4:35 PM Frederic Weisbecker <frederic@xxxxxxxxxx> wrote:
> >
> > Le mer. 24 juil. 2024 à 16:06, Leon Woestenberg <leon@xxxxxxxxxxxxxx> a écrit :
> > > CPUs." and also tried with rcutree.nohz_full_patience_delay=1000.
> > Are you sure you have the proper patch applied? It is not yet upstream:
> >
With the patch installed and adding kernel command option
rcutree.nocb_patience_delay=1000 I can still get rcuc to run on the
isolated #4.
osnoise/4-1525 [004] ....1 697.437093: sample_threshold:
start 697.437087644 duration 3220 ns interference 0
osnoise/4-1525 [004] ....1 697.437094: sample_threshold:
start 697.437090864 duration 3150 ns interference 0
osnoise/4-1525 [004] dNh11 697.438575: irq_noise:
local_timer:236 start 697.438570024 duration 4740 ns
rcuc/4-678 [004] d..3. 697.438588: thread_noise:
rcuc/4:678 start 697.438582884 duration 4190 ns
osnoise/4-1525 [004] ....1 697.438588: sample_threshold:
start 697.438567684 duration 20490 ns interference 2
[ 0.031422] rcu: RCU NOCB CPU patience set to 1000 milliseconds.
[ 0.031420] rcu: Preemptible hierarchical RCU implementation.
[ 0.031421] rcu: RCU restricting CPUs from NR_CPUS=8192 to nr_cpu_ids=16.
[ 0.031421] rcu: RCU priority boosting: priority 1 delay 500 ms.
[ 0.031422] rcu: RCU NOCB CPU patience set to 1000 milliseconds.
[ 0.031423] rcu: RCU_SOFTIRQ processing moved to rcuc kthreads.
[ 0.031423] No expedited grace period (rcu_normal_after_boot).
[ 0.031423] Trampoline variant of Tasks RCU enabled.
[ 0.031424] Rude variant of Tasks RCU enabled.
[ 0.031424] Tracing variant of Tasks RCU enabled.
[ 0.031424] rcu: RCU calculated value of scheduler-enlistment delay
is 25 jiffies.
[ 0.031425] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=16
[ 0.031431] RCU Tasks: Setting shift to 4 and lim to 1 rcu_task_cb_adjust=1.
[ 0.031432] RCU Tasks Rude: Setting shift to 4 and lim to 1
rcu_task_cb_adjust=1.
[ 0.031434] RCU Tasks Trace: Setting shift to 4 and lim to 1
rcu_task_cb_adjust=1.
[ 0.033438] rcu: Offload RCU callbacks from CPUs: 4-15.
[ 0.033439] rcu: Poll for callbacks from no-CBs CPUs.
[ 0.033441] rcu: srcu_init: Setting srcu_struct sizes based on contention.
[ 0.915368] rcu: Hierarchical SRCU implementation.
[ 0.915369] rcu: Max phase no-delay instances is 1000.
Regards, Leon.
