Re: BUG: unable to handle kernel paging request at 00007ffd7ce07800

OK, 8 Cores is the same as 4 as far as I can see, Much Better than 12! :(
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RTAI Testsuite - KERNEL space latency test (output data in nanoseconds)

*** latency verification tool with RTAI own real time kernel tasks ***
***    period = 100000 (ns),  avrgtime = 1 (s)    ***

RTH|    lat min|    ovl min|    lat avg|    lat max|    ovl max|   overruns
RTD|        245|        245|        459|       2168|       2168|          0
RTD|        198|        198|        468|       2985|       2985|          0
RTD|        294|        198|        455|       2538|       2985|          0
RTD|        236|        198|        455|       2443|       2985|          0
RTD|        240|        198|        455|       2851|       2985|          0
RTD|        311|        198|        455|       2559|       2985|          0
^CRTD|        311|        198|        455|       2559|       2985|          0
^C^C
linux-36hs:/usr/realtime/testsuite/kern/latency #


linux-36hs:/usr/realtime/testsuite/kern/latency # dmesg
[  311.385854] I-pipe: head domain RTAI registered.
[  311.385861] RTAI[hal]: mounted. ISOL_CPUS_MASK: 0.
[  311.385863] SYSINFO - # CPUs: 8, TIMER NAME: 'lapic', TIMER IRQ: 4353,
TIMER FREQ: 6246289, CLOCK NAME: 'tsc', CLOCK FREQ: 3398151000, CPU FREQ:
3398151000, LINUX TIMER IRQ: 4353.
[  311.394919] RTAI[malloc]: global heap size = 4194304 bytes, <BSD>.
[  311.404474] , kstacks pool size = 524288 bytes.
[  311.404477] RTAI[sched]: hard timer type/freq = lapic/6246289(Hz);
timing: oneshot; linear timed lists.
[  311.404478] RTAI[sched]: Linux timer freq = 1000 (Hz), TimeBase freq =
3398151000 hz.
[  311.404479] RTAI[sched]: timer setup = 160 ns, resched latency = 0 ns.
[  313.153812] BUG: unable to handle kernel paging request at
00007ffc0b6f4520
[  313.154290] IP: [<ffffffffa0581611>] handle_lxrt_request+0x131/0x7d0
[rtai_sched]
[  313.155398] PGD 7cbf2b067 PUD 7cc186067 PMD 7cc187067 PTE 80000007cb080867
[  313.156513] Oops: 0001 [#3] PREEMPT SMP
[  313.157627] Modules linked in: rtai_sched(O+) rtai_malloc(PO)
rtai_hal(O) fuse af_packet snd_hda_codec_hdmi snd_hda_codec_realtek
snd_hda_codec_generic xfs libcrc32c x86_pkg_temp_thermal coretemp kvm
iTCO_wdt iTCO_vendor_support mxm_wmi snd_hda_intel snd_hda_controller
crct10dif_pclmul snd_hda_codec crc32_pclmul ghash_clmulni_intel snd_hwdep
snd_pcm aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd
snd_timer e1000e snd serio_raw xhci_pci mei_me i2c_i801 ptp xhci_hcd mei
pps_core soundcore shpchp lpc_ich mfd_core dm_mod btrfs xor raid6_pq
crc32c_intel nouveau video i2c_algo_bit drm_kms_helper ttm drm wmi sg
[last unloaded: rtai_hal]
[  313.161364] CPU: 4 PID: 2360 Comm: calibrate Tainted: P      D    O  
3.18.22-STRADM #11
[  313.162649] Hardware name: ASUS All Series/X99-A II, BIOS 0801 06/28/2016
[  313.163927] task: ffff8807cbcd6650 ti: ffff8807cc0a0000 task.ti:
ffff8807cc0a0000
[  313.165209] RIP: 0010:[<ffffffffa0581611>]  [<ffffffffa0581611>]
handle_lxrt_request+0x131/0x7d0 [rtai_sched]
[  313.166509] RSP: 0018:ffff8807cc0a3e78  EFLAGS: 00010206
[  313.167819] RAX: ffff8807cc0a0000 RBX: 00007ffc0b6f4520 RCX:
0000000000000407
[  313.169141] RDX: 0000000000000000 RSI: 00007ffc0b6f4520 RDI:
0000000000407818
[  313.170472] RBP: ffff8807cc0a3ec8 R08: 00007ffc0b6f4f69 R09:
00007ffc00000001
[  313.171794] R10: 00007ffc0b6f44e8 R11: 0000000000000206 R12:
0000000000000000
[  313.173109] R13: 0000000000407818 R14: 0000000000000000 R15:
0000000000000000
[  313.174419] FS:  00007fbabb2b8700(0000) GS:ffff88081fd00000(0000)
knlGS:0000000000000000
[  313.175726] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  313.177028] CR2: 00007ffc0b6f4520 CR3: 00000007cbf2a000 CR4:
00000000003407e0
[  313.178342] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[  313.179655] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
[  313.180959] I-pipe domain Linux
[  313.182245] Stack:
[  313.183530]  00000000000002a6 ffff880700000000 0000000000000000
ffff8807ec4aee60
[  313.184807]  00000000ec4aec00 ffff8807ec4aee48 00007ffc0b6f4520
0000000000000000
[  313.186062]  0000000000407818 0000000000000000 ffff8807cc0a3f38
ffffffffa0581ea0
[  313.187312] Call Trace:
[  313.188563]  [<ffffffffa0581ea0>] rtai_lxrt_invoke+0x1f0/0x900
[rtai_sched]
[  313.189819]  [<ffffffff810ea7c6>] ? __audit_syscall_exit+0x236/0x2e0
[  313.191062]  [<ffffffffa0580295>] lxrt_intercept_syscall+0xc5/0x190
[rtai_sched]
[  313.192307]  [<ffffffff816026d8>] ? int_check_syscall_exit_work+0x34/0x3d
[  313.193546]  [<ffffffff811003a9>] __ipipe_notify_syscall+0x19/0x20
[  313.194748]  [<ffffffff8160234e>] pipeline_syscall+0xa/0x17
[  313.195908] Code: 89 04 24 31 c0 41 ff 52 08 48 83 c4 30 5b 41 5c 41 5d
41 5e 5d c3 48 c7 c7 b8 a6 58 a0 e8 08 c4 12 00 48 c7 c0 da ff ff ff eb 96
<4c> 8b 2e 8d 91 18 fc ff ff 83 fa 20 4c 89 e8 0f 87 85 00 00 00
[  313.197113] RIP  [<ffffffffa0581611>] handle_lxrt_request+0x131/0x7d0
[rtai_sched]
[  313.198282]  RSP <ffff8807cc0a3e78>
[  313.199422] CR2: 00007ffc0b6f4520
[  313.200555] ---[ end trace c6ad8498e3b44420 ]---
[  313.200606] USERMODE CHECK: ERROR.
[  313.200608] USERMODE CHECK PROVIDED (ns): KernelLatency 0, UserLatency 0.
[  313.200609] FINAL CALIBRATION SUMMARY (ns): KernelLatency 0,
UserLatency 0.
[  321.189508]

CPU USE SUMMARY
[  321.189512] # 0 -> 79722
[  321.189513] # 1 -> 0
[  321.189514] # 2 -> 0
[  321.189514] # 3 -> 0
[  321.189515] # 4 -> 0
[  321.189516] # 5 -> 0
[  321.189516] # 6 -> 0
[  321.189517] # 7 -> 0
[  321.189518] END OF CPU USE SUMMARY

[  326.447805] RTAI[sched]: unloaded (forced hard/soft/hard transitions:
traps 0, syscalls 0).
[  326.453228] RTAI[malloc]: unloaded.
[  326.458443] I-pipe: head domain RTAI unregistered.
[  326.458450] RTAI[hal]: unmounted.
linux-36hs:/usr/realtime/testsuite/kern/latency #

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