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PRISM v5.23.0 [690b962] [sched=eevdf+pandemonium]
captured: 20261004-140722
SCHEDULER STABILITY
no ejection -- scheduler ran clean
CLEAN-ROOM
state NOISY -- load 0.4/16cpu, uptime 2.5h
SYSTEM
cpu AMD Ryzen 9 5950X 16-Core Processor (16c/16t)
memory 31,2 GiB
gpu amdgpu (1002:747E)
kernel 7.2.9-1-cachyos
scheduler pandemonium
STALL SUSCEPTIBILITY
kernel 7.2.9-1-cachyos
tick HZ=1000 NO_HZ_FULL preempt=PREEMPT_DYNAMIC
cpus 16 governor=performance deepest-idle=C2 (3 states)
cmdline nohz_full=- isolcpus=-
verdict score 4 -> MODERATE
factors HZ=1000 (tight ticks -- narrows window); idle CPUs go tickless (NO_HZ_IDLE behavior; NO_HZ_FULL built but no nohz_full= mask, so unused); 16 CPUs (many idle at once)
COMPARISON (p99 wake2run, lower is better)
fork-thread EEVDF n/a -> BPF 16723us, ADAPTIVE 23688us
ipc EEVDF n/a -> BPF 667us, ADAPTIVE 670us
pcpu-burst EEVDF n/a -> PANDEMONIUM 23998us
sojourn-pressure EEVDF n/a -> PANDEMONIUM 938us
cachyos EEVDF n/a -> BPF 998us, ADAPTIVE 999us
POPULATION (montauk cross-run statistics over 9 run(s), per workload)
cachyos-primes eevdf vs pandemonium-adaptive: N=2 cliff +1.00 perm p=0.018 power n=3
cachyos-primes eevdf vs pandemonium-bpf: N=2 cliff +1.00 perm p=0.018 power n=3
cachyos-primes pandemonium-adaptive vs pandemonium-bpf: N=9 cliff +0.09 perm p=0.873 power n>20
cachyos-stress-ng-cpu-cache-mem eevdf vs pandemonium-adaptive: N=2 cliff +0.89 perm p=0.036 power n=4
cachyos-stress-ng-cpu-cache-mem eevdf vs pandemonium-bpf: N=2 cliff +1.00 perm p=0.018 power n=4
cachyos-stress-ng-cpu-cache-mem pandemonium-adaptive vs pandemonium-bpf: N=9 cliff +0.33 perm p=0.326 power n>20
cachyos-xz-compression eevdf vs pandemonium-adaptive: N=2 cliff +1.00 perm p=0.018 power n=4
cachyos-xz-compression eevdf vs pandemonium-bpf: N=2 cliff +1.00 perm p=0.018 power n=3
cachyos-xz-compression pandemonium-adaptive vs pandemonium-bpf: N=9 cliff +0.11 perm p=0.718 power n>20
cold-wake-16c eevdf vs pandemonium: N=2 cliff -0.86 perm p=0.278 power n=9
cold-wake-starve-16c eevdf vs pandemonium: N=2 cliff +1.00 perm p=0.028 power n=3
fork-thread eevdf vs pandemonium-adaptive: N=2 cliff +1.00 perm p=0.018 power n=3
fork-thread eevdf vs pandemonium-bpf: N=2 cliff +1.00 perm p=0.018 power n=3
fork-thread pandemonium-adaptive vs pandemonium-bpf: N=9 cliff -0.04 perm p=0.842 power n>20
ipc-16c eevdf vs pandemonium-adaptive: N=2 cliff +0.14 perm p=0.833 power n=19
ipc-16c eevdf vs pandemonium-bpf: N=2 cliff -0.14 perm p=0.444 power n=14
ipc-16c pandemonium-adaptive vs pandemonium-bpf: N=7 cliff -0.06 perm p=0.797 power n>20
ipc-32c pandemonium-adaptive vs pandemonium-bpf: N=2 cliff +1.00 perm p=0.333 power n=3
pcpu-burst-16c eevdf vs pandemonium: N=2 cliff -0.57 perm p=0.222 power n=8
sojourn-pressure-16c eevdf vs pandemonium: N=2 cliff +0.86 perm p=0.056 power n=5
cachyos-primes MCB best (lower p99): pandemonium-adaptive (tied), pandemonium-bpf (tied)
cachyos-stress-ng-cpu-cache-mem MCB best (lower p99): pandemonium-adaptive (tied), pandemonium-bpf (tied)
cachyos-xz-compression MCB best (lower p99): pandemonium-adaptive (tied), pandemonium-bpf (tied)
cold-wake-16c MCB best (lower p99): eevdf
cold-wake-starve-16c MCB best (lower p99): pandemonium
fork-thread MCB best (lower p99): pandemonium-adaptive (tied), pandemonium-bpf (tied)
ipc-16c MCB best (lower p99): eevdf (tied), pandemonium-adaptive (tied)
ipc-32c MCB best (lower p99): pandemonium-bpf
pcpu-burst-16c MCB best (lower p99): eevdf
sojourn-pressure-16c MCB best (lower p99): pandemonium
N<3 per arm -- montauk reports the effect size but the inference is underpowered; repeat runs accumulate here
STORM (cpu_release flood, powersave -- lower storm% is better)
clean -- no storm intervals; storm 0/72 intervals (0.0%); reenq/s p50=13428 peak=13636; kick/s=219708 (preempt 118621) reenq/s=12607
WORKLOAD cachyos-PANDEMONIUM-ADAPTIVE-primes
POORLY-BEHAVING ITEMS (ranked)
kind id metric value sev
hot-cpu 15 l2_miss_share 51.8416 HIGH
long-range-dependent dispatch-rate hurst 0.586287 MED
discord 682ms profile_vs_mean 1.58664 MED
long-range-dependent migration-rate hurst 0.586071 MED
CAPTURE complete -- 11119 events, none dropped
KEY METRICS
REPORT sched
VERDICT: 6.1k wake2run; p50 4us p99 1001us p999 1003us worst 2403us; 76.4% fast(<100us) / 18.1% mid / 5.5% tick-floor(>=900us); 2.9% cross-domain
STRUCTURE: latency-over-trace RANDOM; ~4020 distinct values; inversion ratio 0.58
WORKLOAD cachyos-PANDEMONIUM-ADAPTIVE-stress-ng-cpu-cache-mem
POORLY-BEHAVING ITEMS (ranked)
kind id metric value sev
long-range-dependent migration-rate hurst 0.882687 MED
migration-avalanche migration-rate runs 67 MED
discord 8390ms profile_vs_mean 2.11169 MED
long-range-dependent dispatch-rate hurst 0.876169 MED
hot-cpu 15 l2_miss_share 6.84308 LOW
CAPTURE complete -- 71066 events, none dropped
KEY METRICS
REPORT sched
VERDICT: 61.2k wake2run; p50 4us p99 1000us p999 1002us worst 1677us; 81.8% fast(<100us) / 16.0% mid / 2.3% tick-floor(>=900us); 4.6% cross-domain
STRUCTURE: latency-over-trace RANDOM; ~50719 distinct values; inversion ratio 0.53
WORKLOAD cachyos-PANDEMONIUM-ADAPTIVE-xz-compression
POORLY-BEHAVING ITEMS (ranked)
kind id metric value sev
long-range-dependent dispatch-rate hurst 0.68998 MED
migration-avalanche migration-rate runs 15 MED
discord 2372ms profile_vs_mean 1.57868 MED
long-range-dependent migration-rate hurst 0.584428 MED
ioctl-slow 469490/xz duration_ms 0.00047 LOW
hot-cpu 10 l2_miss_share 7.47497 LOW
ioctl-slow 469490/xz duration_ms 0.00035 LOW
CAPTURE complete -- 74316 events, none dropped
KEY METRICS
REPORT sched
VERDICT: 12.1k wake2run; p50 4us p99 999us p999 1004us worst 1998us; 81.4% fast(<100us) / 16.3% mid / 2.3% tick-floor(>=900us); 2.5% cross-domain
STRUCTURE: latency-over-trace RANDOM; ~9642 distinct values; inversion ratio 0.48
WORKLOAD cachyos-PANDEMONIUM-BPF-primes
POORLY-BEHAVING ITEMS (ranked)
kind id metric value sev
hot-cpu 15 l2_miss_share 55.6374 HIGH
long-range-dependent migration-rate hurst 0.605498 MED
migration-avalanche migration-rate runs 19 MED
discord 617ms profile_vs_mean 1.65303 MED
long-range-dependent dispatch-rate hurst 0.59497 MED
CAPTURE complete -- 11443 events, none dropped
KEY METRICS
REPORT sched
VERDICT: 6.5k wake2run; p50 4us p99 1000us p999 1002us worst 1003us; 72.9% fast(<100us) / 22.3% mid / 4.8% tick-floor(>=900us); 3.5% cross-domain
STRUCTURE: latency-over-trace RANDOM; ~4542 distinct values; inversion ratio 0.52
WORKLOAD cachyos-PANDEMONIUM-BPF-stress-ng-cpu-cache-mem
POORLY-BEHAVING ITEMS (ranked)
kind id metric value sev
long-range-dependent dispatch-rate hurst 0.883447 MED
migration-avalanche migration-rate runs 100 MED
discord 9759ms profile_vs_mean 1.87373 MED
long-range-dependent migration-rate hurst 0.835662 MED
hot-cpu 15 l2_miss_share 7.0621 LOW
CAPTURE complete -- 70853 events, none dropped
KEY METRICS
REPORT sched
VERDICT: 59.3k wake2run; p50 4us p99 823us p999 1000us worst 1004us; 79.6% fast(<100us) / 19.8% mid / 0.6% tick-floor(>=900us); 3.8% cross-domain
STRUCTURE: latency-over-trace RANDOM; ~52805 distinct values; inversion ratio 0.47
LOCATED: 1 structured region(s) NEARLY_SORTED[71%..72%]
WORKLOAD cachyos-PANDEMONIUM-BPF-xz-compression
POORLY-BEHAVING ITEMS (ranked)
kind id metric value sev
long-range-dependent dispatch-rate hurst 0.667594 MED
migration-avalanche migration-rate runs 18 MED
discord 827ms profile_vs_mean 1.54144 MED
long-range-dependent migration-rate hurst 0.613145 MED
ioctl-slow 469258/xz duration_ms 0.00062 LOW
hot-cpu 11 l2_miss_share 7.65949 LOW
ioctl-slow 469258/xz duration_ms 0.0005 LOW
CAPTURE complete -- 74920 events, none dropped
KEY METRICS
REPORT sched
VERDICT: 12.4k wake2run; p50 4us p99 998us p999 1003us worst 1048us; 81.7% fast(<100us) / 16.4% mid / 1.9% tick-floor(>=900us); 4.0% cross-domain
STRUCTURE: latency-over-trace RANDOM; ~10072 distinct values; inversion ratio 0.48
WORKLOAD cold-wake-16c-PANDEMONIUM
THERMAL/POWER
cpu temp peak 58.2 C avg 51.5 C
power avg 71.8 W peak 104.0 W
idle C2 avg 96.1% (dominant)
POORLY-BEHAVING ITEMS (ranked)
kind id metric value sev
hot-cpu 4 l2_miss_share 70.0112 HIGH
kthread-strand comm#288f4905 max_strand_ms 21.9971 MED
long-range-dependent dispatch-rate hurst 0.695716 MED
kthread-strand comm#1beae9e3 max_strand_ms 6.00038 MED
CAPTURE complete -- 1000 events, none dropped
KEY METRICS
REPORT sched
VERDICT: 168 wake2run; p50 2us p99 678us p999 1559us worst 1559us; 97.0% fast(<100us) / 2.4% mid / 0.6% tick-floor(>=900us); 0.0% cross-domain
STRUCTURE: latency-over-trace RANDOM; ~157 distinct values; inversion ratio 0.48
REPORT kstrand
VERDICT: 3 strands across 2 per-CPU kthreads; worst HELD strand 22.0ms (I/O-completion freeze signature)
kthread cpu strands max_ms p99_ms held dark held_by
comm#288f4905 4 2 22.0 22.0 2 0 tid=0 0%
comm#1beae9e3 4 1 6.0 6.0 1 0 tid=0 0%
COLD-WAKE: cold-cache worst 3.3x at 32KB (0.02ms cold); CPU freq ramp worst +43%
WORKLOAD cold-wake-starve-16c-PANDEMONIUM
THERMAL/POWER
cpu temp peak 61.5 C avg 53.7 C
power avg 84.7 W peak 108.0 W
idle C2 avg 94.7% (dominant)
POORLY-BEHAVING ITEMS (ranked)
kind id metric value sev
discord 42470ms profile_vs_mean 3.30513 HIGH
hot-cpu 15 l2_miss_share 66.0071 HIGH
mid-trace-death comm#e3e3b2d0/489914 before_end_s 35.023 MED
long-range-dependent dispatch-rate hurst 0.917944 MED
mid-trace-death comm#e3e3b2d0/489943 before_end_s 28.0028 MED
mid-trace-death comm#e3e3b2d0/490032 before_end_s 7.00089 MED
CAPTURE complete -- 216034 events, none dropped
KEY METRICS
REPORT sched
VERDICT: 98.4k wake2run; p50 2us p99 5us p999 11us worst 777us; 100.0% fast(<100us) / 0.0% mid / 0.0% tick-floor(>=900us); 0.0% cross-domain
STRUCTURE: latency-over-trace RANDOM; ~70721 distinct values; inversion ratio 0.70
LOCATED: 3 structured region(s) FEW_UNIQUE[27%..27%], FEW_UNIQUE[28%..30%], FEW_UNIQUE[35%..35%]
WORKLOAD fork-thread-PANDEMONIUM-ADAPTIVE
THERMAL/POWER
cpu temp peak 62.0 C avg 55.1 C
power avg 96.9 W peak 164.6 W
idle C2 avg 77.0% (dominant)
POORLY-BEHAVING ITEMS (ranked)
kind id metric value sev
order-starved tid=467398 passover_picks 8745 HIGH
held-cpu tid=473134 held_ms 9.47399 HIGH
self-preempt tid=467553 stint_wake_ratio 8739 HIGH
self-preempt tid=467398 stint_wake_ratio 8738 HIGH
self-preempt tid=467554 stint_wake_ratio 8720 HIGH
self-preempt tid=467440 stint_wake_ratio 8697 HIGH
order-starved tid=467554 passover_picks 8243 HIGH
held-cpu tid=473331 held_ms 7.62668 HIGH
self-preempt tid=473084 stint_wake_ratio 4811 HIGH
self-preempt tid=473086 stint_wake_ratio 2877 HIGH
self-preempt tid=473083 stint_wake_ratio 1866 HIGH
order-starved tid=467440 passover_picks 8124 HIGH
held-cpu tid=473209 held_ms 4.87002 HIGH
self-preempt tid=473085 stint_wake_ratio 1443 HIGH
long-range-dependent dispatch-rate hurst 0.834541 MED
migration-avalanche migration-rate runs 362 MED
discord 144ms profile_vs_mean 1.76619 MED
long-range-dependent migration-rate hurst 0.809113 MED
hot-cpu 5 l2_miss_share 6.65894 LOW
CAPTURE complete -- 548798 events, none dropped
KEY METRICS
REPORT sched
VERDICT: 64.2k wake2run; p50 2176us p99 23688us p999 37148us worst 39599us; 22.4% fast(<100us) / 14.3% mid / 63.3% tick-floor(>=900us); 3.6% cross-domain
STRUCTURE: latency-over-trace RANDOM; ~64229 distinct values; inversion ratio 0.61
LOCATED: 2 structured region(s) NEARLY_SORTED[0%..1%], NEARLY_SORTED[79%..80%]
REPORT dispatch-stall
VERDICT: 40.7k saturated wakes over the 900us floor; PREEMPT-STARVED 0% (0 intervening picks) / ORDER-STARVED 100% (CPU served others first); avg 47.6 pass-overs, p99 230 pass-overs
WORKLOAD fork-thread-PANDEMONIUM-BPF
THERMAL/POWER
cpu temp peak 62.0 C avg 55.4 C
power avg 95.9 W peak 165.1 W
idle C2 avg 74.7% (dominant)
POORLY-BEHAVING ITEMS (ranked)
kind id metric value sev
order-starved tid=467440 passover_picks 33411 HIGH
held-cpu tid=472031 held_ms 11.6609 HIGH
self-preempt tid=467553 stint_wake_ratio 8624 HIGH
self-preempt tid=467554 stint_wake_ratio 8605 HIGH
self-preempt tid=467398 stint_wake_ratio 8573 HIGH
self-preempt tid=467440 stint_wake_ratio 8550 HIGH
order-starved tid=467553 passover_picks 29140 HIGH
held-cpu tid=472030 held_ms 6.17598 HIGH
self-preempt tid=471973 stint_wake_ratio 3421 HIGH
self-preempt tid=471975 stint_wake_ratio 2625 HIGH
self-preempt tid=471972 stint_wake_ratio 1863 HIGH
order-starved tid=467554 passover_picks 16362 HIGH
held-cpu tid=472268 held_ms 5.99774 HIGH
self-preempt tid=471974 stint_wake_ratio 1401 HIGH
long-range-dependent dispatch-rate hurst 0.80872 MED
migration-avalanche migration-rate runs 360 MED
discord 577ms profile_vs_mean 1.87049 MED
long-range-dependent migration-rate hurst 0.808628 MED
hot-cpu 8 l2_miss_share 6.50245 LOW
CAPTURE complete -- 593756 events, none dropped
KEY METRICS
REPORT sched
VERDICT: 66.9k wake2run; p50 2237us p99 16723us p999 27875us worst 30411us; 24.3% fast(<100us) / 13.4% mid / 62.3% tick-floor(>=900us); 3.4% cross-domain
STRUCTURE: latency-over-trace RANDOM; ~66902 distinct values; inversion ratio 0.58
LOCATED: 1 structured region(s) NEARLY_SORTED[0%..1%]
REPORT dispatch-stall
VERDICT: 41.7k saturated wakes over the 900us floor; PREEMPT-STARVED 0% (0 intervening picks) / ORDER-STARVED 100% (CPU served others first); avg 49.5 pass-overs, p99 228 pass-overs
WORKLOAD ipc-PANDEMONIUM-ADAPTIVE-16c
THERMAL/POWER
cpu temp peak 57.5 C avg 53.0 C
power avg 116.0 W peak 141.3 W
idle C2 avg 40.3% (dominant)
POORLY-BEHAVING ITEMS (ranked)
kind id metric value sev
order-starved comm#8a5f93b2 passover_picks 94 HIGH
held-cpu comm#8a5f93b2 held_ms 22.1587 HIGH
self-preempt tid=486248 stint_wake_ratio 29158 HIGH
hot-cpu 0 l2_miss_share 19.6138 HIGH
self-preempt tid=486256 stint_wake_ratio 27789 HIGH
self-preempt tid=486249 stint_wake_ratio 25498 HIGH
self-preempt tid=486266 stint_wake_ratio 20814 HIGH
order-starved comm#8a5f93b2 passover_picks 81 HIGH
held-cpu comm#8a5f93b2 held_ms 18.8434 HIGH
self-preempt tid=467440 stint_wake_ratio 11165 HIGH
self-preempt tid=467553 stint_wake_ratio 11147 HIGH
self-preempt tid=467398 stint_wake_ratio 11103 HIGH
order-starved comm#8a5f93b2 passover_picks 77 HIGH
held-cpu comm#8a5f93b2 held_ms 16.3602 HIGH
self-preempt tid=467554 stint_wake_ratio 11098 HIGH
hot-waker 486319 wakes_issued 79619 MED
long-range-dependent dispatch-rate hurst 0.884915 MED
migration-avalanche migration-rate runs 701 MED
long-range-dependent migration-rate hurst 0.573166 MED
recvfrom-slow 486296/pand-ipc duration_ms 1.67516 LOW
recvfrom-slow 486294/pand-ipc duration_ms 1.22195 LOW
recvfrom-slow 486294/pand-ipc duration_ms 1.04714 LOW
recvfrom-slow 486294/pand-ipc duration_ms 0.798966 LOW
recvfrom-slow 486294/pand-ipc duration_ms 0.765166 LOW
ioctl-slow 486312/python3 duration_ms 0.00137 LOW
ioctl-slow 486312/python3 duration_ms 0.00054 LOW
ioctl-slow 486312/python3 duration_ms 0.0005 LOW
ioctl-slow 486312/python3 duration_ms 0.00047 LOW
ioctl-slow 486312/python3 duration_ms 0.00045 LOW
CAPTURE complete -- 1695678 events, none dropped
KEY METRICS
REPORT sched
VERDICT: 259k wake2run; p50 3us p99 670us p999 1112us worst 1967us; 95.5% fast(<100us) / 4.0% mid / 0.4% tick-floor(>=900us); 4.5% cross-domain
STRUCTURE: latency-over-trace RANDOM; ~178358 distinct values; inversion ratio 0.51
LOCATED: 33 structured region(s) FEW_UNIQUE[0%..0%], FEW_UNIQUE[0%..1%], FEW_UNIQUE[1%..1%], FEW_UNIQUE[2%..3%], FEW_UNIQUE[3%..4%] +28 more
REPORT dispatch-stall
VERDICT: 1.1k saturated wakes over the 900us floor; PREEMPT-STARVED 17% (0 intervening picks) / ORDER-STARVED 83% (CPU served others first); avg 3.4 pass-overs, p99 12 pass-overs
WORKLOAD ipc-PANDEMONIUM-BPF-16c
THERMAL/POWER
cpu temp peak 57.8 C avg 54.1 C
power avg 119.2 W peak 141.6 W
idle C2 avg 30.6% (dominant)
POORLY-BEHAVING ITEMS (ranked)
kind id metric value sev
order-starved comm#8a5f93b2 passover_picks 73 HIGH
held-cpu comm#8a5f93b2 held_ms 17.1721 HIGH
self-preempt tid=485892 stint_wake_ratio 29710 HIGH
self-preempt tid=485895 stint_wake_ratio 28557 HIGH
self-preempt tid=485897 stint_wake_ratio 20552 HIGH
self-preempt tid=485899 stint_wake_ratio 19875 HIGH
order-starved comm#328ab0c6 passover_picks 62 HIGH
held-cpu comm#8a5f93b2 held_ms 15.3571 HIGH
self-preempt tid=485880 stint_wake_ratio 12709 HIGH
self-preempt tid=467440 stint_wake_ratio 12222 HIGH
self-preempt tid=467398 stint_wake_ratio 12205 HIGH
order-starved comm#8a5f93b2 passover_picks 60 HIGH
held-cpu comm#8a5f93b2 held_ms 14.2286 HIGH
self-preempt tid=467553 stint_wake_ratio 12157 HIGH
hot-waker 485952 wakes_issued 79661 MED
long-range-dependent dispatch-rate hurst 0.91042 MED
migration-avalanche migration-rate runs 420 MED
discord 5216ms profile_vs_mean 1.6239 MED
hot-cpu 1 l2_miss_share 15.6103 MED
long-range-dependent migration-rate hurst 0.575401 MED
recvfrom-slow 485929/pand-ipc duration_ms 3.02187 LOW
recvfrom-slow 485931/pand-ipc duration_ms 3.02169 LOW
recvfrom-slow 485929/pand-ipc duration_ms 2.08727 LOW
recvfrom-slow 485931/pand-ipc duration_ms 2.08336 LOW
recvfrom-slow 485929/pand-ipc duration_ms 2.02452 LOW
ioctl-slow 485947/python3 duration_ms 0.00099 LOW
ioctl-slow 485947/python3 duration_ms 0.00055 LOW
ioctl-slow 485947/python3 duration_ms 0.00049 LOW
ioctl-slow 485947/python3 duration_ms 0.00047 LOW
ioctl-slow 485947/python3 duration_ms 0.00038 LOW
CAPTURE complete -- 1712262 events, none dropped
KEY METRICS
REPORT sched
VERDICT: 257k wake2run; p50 3us p99 667us p999 994us worst 2338us; 95.7% fast(<100us) / 4.0% mid / 0.3% tick-floor(>=900us); 2.7% cross-domain
STRUCTURE: latency-over-trace RANDOM; ~192957 distinct values; inversion ratio 0.50
LOCATED: 39 structured region(s) FEW_UNIQUE[1%..1%], FEW_UNIQUE[1%..1%], FEW_UNIQUE[2%..2%], FEW_UNIQUE[3%..4%], FEW_UNIQUE[4%..4%] +34 more
REPORT dispatch-stall
VERDICT: 860 saturated wakes over the 900us floor; PREEMPT-STARVED 16% (0 intervening picks) / ORDER-STARVED 84% (CPU served others first); avg 2.2 pass-overs, p99 11 pass-overs
WORKLOAD pcpu-burst-16c-PANDEMONIUM
THERMAL/POWER
cpu temp peak 63.5 C avg 59.9 C
power avg 137.2 W peak 161.9 W
idle C2 avg 30.5% (dominant)
POORLY-BEHAVING ITEMS (ranked)
kind id metric value sev
order-starved comm#328ab0c6 passover_picks 11755 HIGH
doublefree-logic 486700/0x0000558bdef517f0 bytes 24 HIGH
self-preempt tid=467553 stint_wake_ratio 17558 HIGH
doublefree-logic 486699/0x0000564318bf47f0 bytes 24 HIGH
doublefree-logic 486698/0x000055f60257d7f0 bytes 24 HIGH
self-preempt tid=467554 stint_wake_ratio 17466 HIGH
doublefree-logic 486697/0x0000561c9d5cf7f0 bytes 24 HIGH
doublefree-logic 486696/0x000055aab896f7f0 bytes 24 HIGH
self-preempt tid=467440 stint_wake_ratio 17437 HIGH
doublefree-logic 486695/0x000055b0435cd7f0 bytes 24 HIGH
doublefree-logic 486694/0x000055b61c55c7f0 bytes 24 HIGH
self-preempt tid=467398 stint_wake_ratio 17212 HIGH
doublefree-logic 486693/0x0000558aa17777f0 bytes 24 HIGH
order-starved comm#328ab0c6 passover_picks 10403 HIGH
doublefree-logic 486692/0x00005588174457f0 bytes 24 HIGH
self-preempt tid=16 stint_wake_ratio 4524 HIGH
doublefree-logic 486691/0x0000558c2e8cc7f0 bytes 24 HIGH
doublefree-logic 486690/0x0000556352f2f7f0 bytes 24 HIGH
self-preempt tid=486662 stint_wake_ratio 4232 HIGH
doublefree-logic 486688/0x0000561f08a857f0 bytes 24 HIGH
doublefree-logic 486684/0x000056540efbd7f0 bytes 24 HIGH
self-preempt tid=486641 stint_wake_ratio 3013 HIGH
doublefree-logic 486683/0x0000560a2f5747f0 bytes 24 HIGH
doublefree-logic 486680/0x000055c4075627f0 bytes 24 HIGH
order-starved comm#328ab0c6 passover_picks 6412 HIGH
doublefree-logic 486679/0x0000555f02b3e7f0 bytes 24 HIGH
self-preempt tid=981 stint_wake_ratio 2330 HIGH
kthread-strand comm#12f62140 max_strand_ms 9.91583 MED
long-range-dependent dispatch-rate hurst 0.855332 MED
discord 11430ms profile_vs_mean 2.41306 MED
poll-slow 486669/pandemonium duration_ms 0.0015 LOW
hot-cpu 0 l2_miss_share 7.55532 LOW
poll-slow 486670/pandemonium duration_ms 0.00128 LOW
poll-slow 486671/pandemonium duration_ms 0.00127 LOW
poll-slow 486685/pandemonium duration_ms 0.00122 LOW
poll-slow 486673/pandemonium duration_ms 0.00121 LOW
CAPTURE complete -- 465548 events, none dropped
KEY METRICS
REPORT sched
VERDICT: 27.9k wake2run; p50 4358us p99 23998us p999 27106us worst 31997us; 24.2% fast(<100us) / 3.5% mid / 72.3% tick-floor(>=900us); 0.0% cross-domain
STRUCTURE: latency-over-trace RANDOM; ~27451 distinct values; inversion ratio 0.35
LOCATED: 8 structured region(s) NEARLY_SORTED[20%..22%], NEARLY_SORTED[29%..31%], NEARLY_SORTED[39%..42%], NEARLY_SORTED[50%..51%], NEARLY_SORTED[59%..61%] +3 more
REPORT dispatch-stall
VERDICT: 20.2k saturated wakes over the 900us floor; PREEMPT-STARVED 0% (0 intervening picks) / ORDER-STARVED 100% (CPU served others first); avg 13.6 pass-overs, p99 61 pass-overs
REPORT kstrand
VERDICT: 1 strands across 1 per-CPU kthreads; worst HELD strand 9.9ms (I/O-completion freeze signature)
kthread cpu strands max_ms p99_ms held dark held_by
comm#12f62140 6 1 9.9 9.9 1 0 comm#8a5f93b2 21%
WORKLOAD sojourn-pressure-16c-PANDEMONIUM
THERMAL/POWER
cpu temp peak 61.0 C avg 57.3 C
power avg 128.9 W peak 156.2 W
idle C2 avg 37.9% (dominant)
POORLY-BEHAVING ITEMS (ranked)
kind id metric value sev
held-cpu comm#8a5f93b2 held_ms 3.24178 HIGH
self-preempt tid=467440 stint_wake_ratio 13030 HIGH
self-preempt tid=467398 stint_wake_ratio 13003 HIGH
self-preempt tid=467554 stint_wake_ratio 12991 HIGH
self-preempt tid=467553 stint_wake_ratio 12978 HIGH
held-cpu comm#8a5f93b2 held_ms 2.89858 HIGH
self-preempt tid=489335 stint_wake_ratio 4690 HIGH
self-preempt tid=489420 stint_wake_ratio 2536 HIGH
self-preempt tid=489355 stint_wake_ratio 2534 HIGH
held-cpu comm#8a5f93b2 held_ms 2.20147 HIGH
self-preempt tid=489398 stint_wake_ratio 2532 HIGH
order-starved comm#328ab0c6 passover_picks 4 MED
mean-reverting dispatch-rate hurst 0.318688 MED
discord 1864ms profile_vs_mean 1.61897 MED
order-starved comm#328ab0c6 passover_picks 2 MED
order-starved comm#8a5f93b2 passover_picks 2 MED
hot-cpu 15 l2_miss_share 9.1186 LOW
CAPTURE complete -- 287138 events, none dropped
KEY METRICS
REPORT sched
VERDICT: 4.4k wake2run; p50 4us p99 938us p999 1166us worst 1804us; 96.0% fast(<100us) / 2.9% mid / 1.1% tick-floor(>=900us); 0.0% cross-domain
STRUCTURE: latency-over-trace RANDOM; ~2962 distinct values; inversion ratio 0.58
REPORT dispatch-stall
VERDICT: 48 saturated wakes over the 900us floor; PREEMPT-STARVED 71% (0 intervening picks) / ORDER-STARVED 29% (CPU served others first); avg 1.4 pass-overs, p99 3 pass-overs
