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rtirq update - 2015 edition

16 February, 2015 - 18:30 — rncbc

just in time for the mardi gras, rtirq has been updated ;)

http://www.rncbc.org/archive/#rtirq

original packages are available:

rtirq-20150216.tar.gz
rtirq-20150216-35.src.rpm
rtirq-20150216-35.noarch.rpm

DISCLAIMER: rtirq only makes sense on PREEMPT_RT or threadirqs enabled kernels (>= 2.6.39).

cheers && enjoy

Comments

17 February, 2015 - 03:59 — Olinuxx (not verified)

Hi Rui, I was looking for any changelog or what's new to check what have been changed from the last version. Do you have any pointer for me ?
Thanks for your work.
Olivier

17 February, 2015 - 10:43 — rncbc
rncbc's picture

not much of a changelog but the rpm spec file has something of the sort: lines from it are literally pasted here as follows:

$ rpm -q --changelog rtirq
* Mon Feb 16 2015 Rui Nuno Capela 
- Added "xhci_hcd" (USB 3.x) to "usb" keyword roster.
- Removed (old) "rtc" from default config list.
- Version 20150216.

...

hth.
cheers

17 February, 2015 - 16:05 — Olinuxx (not verified)

Awesome. Thanks for the answer and the software Rui.
Cheers.

22 March, 2015 - 08:00 — hifi25nl (not verified)

What is the reason behind the removal or rtc from default config list?
I am using the linux-rt kernel 3.18.9-rt5-1-rt from archlinux aur.
Without rtc as first item usb priority could be higher than rtc0 priority

23 March, 2015 - 09:27 — rncbc
rncbc's picture

main reason is that rtc is seldom used if at all on modern kernels and applications.

check /proc/interrupts for IRQ line 8 (rtc0) ... how many times does a cpu, any cpu core, is being interrupted by rtc ? probably only once on just a single core due on system boot, so making the rtc irq service thread on highest priority has been a pure waste of scheduler real-time priority queue range. whatever.

hth.
cheers

9 May, 2015 - 16:49 — hifi25nl (not verified)

How to assign priority only to single USB port? Do you confirm that this is working with last version? Example:
RTIRQ_NAME_LIST="usb6"

I have some reports about problems.

9 May, 2015 - 17:43 — rncbc
rncbc's picture

yes, i believe that's still the way to go.

what problems are you having to report?

13 May, 2015 - 15:32 — hifi25nl (not verified)

Thi is the report
1) with RTIRQ_NAME_LIST="rtc usb2 eno1"

RTPRIO PRI COMMAND
93 133 irq/25-xhci_hcd
90 130 irq/8-rtc0
80 120 irq/28-eno1
50 90 irq/9-acpi
50 90 irq/12-i8042
50 90 irq/1-i8042
50 90 irq/16-ehci_hcd
50 90 irq/26-0000:00:
50 90 irq/23-ehci_hcd
50 90 irq/27-mei_me
50 90 irq/29-i915

2) with RTIRQ_NAME_LIST="rtc xhci_hcd eno1"

RTPRIO PRI COMMAND
90 130 irq/8-rtc0
85 125 irq/25-xhci_hcd
80 120 irq/28-eno1
50 90 irq/9-acpi
50 90 irq/12-i8042
50 90 irq/1-i8042
50 90 irq/16-ehci_hcd
50 90 irq/26-0000:00:
50 90 irq/23-ehci_hcd
50 90 irq/27-mei_me
50 90 irq/29-i915
​
This is strange, since in the first case xhci_hcd should be at 85 priority, if RTIRQ_PRIO_DECR=5
The second case is correct.

14 May, 2015 - 16:47 — rncbc
rncbc's picture

weird that something is ever getting an rtprio higher than 90 if not listed in RTIRQ_HIGH_LIST :S

show us your `cat /proc/interrupts`, please?

15 May, 2015 - 07:31 — hifi25nl (not verified)

This is the output

​           CPU0       CPU1       CPU2       CPU3       CPU4       CPU5       CPU6       CPU7                                          
  0:         37          0          0          0          0          0          0          0   IO-APIC-edge      timer
  1:          2          0          0          0          0          0          0          0   IO-APIC-edge      i8042
  8:          0          0          0          0          0          0          1          0   IO-APIC-edge      rtc0
  9:          0          0          0          0          1          1          0          1   IO-APIC-fasteoi   acpi
 12:          2          0          0          0          1          0          1          0   IO-APIC-edge      i8042
 16:         23          0          1          0          0          4          1          0   IO-APIC  16-fasteoi   ehci_hcd:usb1
 23:          0         13          2          1          0          1          0         16   IO-APIC  23-fasteoi   ehci_hcd:usb4
 25:    2750941     141347     150979      94319     187675     113210      92911      43683   PCI-MSI-edge      xhci_hcd
 26:      21274      13051       6333       3924      12755      10667       4150       3018   PCI-MSI-edge      0000:00:1f.2
 27:          2          0          0          0          2          0          3          5   PCI-MSI-edge      mei_me
 28:     231714      62723      32365      14787      51218      52583      17436      11550   PCI-MSI-edge      eno1
 29:        518         11         24          8        668         39         75         19   PCI-MSI-edge      i915
NMI:        242        129        166        177        194        116        153        153   Non-maskable interrupts
LOC:   26316118   26374141   26332646   26329023   26257279   26268071   26271780   26285810   Local timer interrupts
SPU:          0          0          0          0          0          0          0          0   Spurious interrupts
PMI:        242        129        166        177        194        116        153        153   Performance monitoring interrupts
IWI:          0          0          0          0          0          0          0          0   IRQ work interrupts
RTR:          1          0          0          0          0          0          0          0   APIC ICR read retries
RES:      15720      49372      30005      25011       7885      16587       9782       6651   Rescheduling interrupts
CAL:        977        961        966        952        965        943       1003       1034   Function call interrupts
TLB:        288        342        282        270        194        214        171        143   TLB shootdowns
TRM:          0          0          0          0          0          0          0          0   Thermal event interrupts
THR:          0          0          0          0          0          0          0          0   Threshold APIC interrupts
MCE:          0          0          0          0          0          0          0          0   Machine check exceptions
MCP:         89         89         89         89         89         89         89         89   Machine check polls
HYP:          0          0          0          0          0          0          0          0   Hypervisor callback interrupts
ERR:          0
MIS:          0

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