[asterisk-users] How to read IRQs and timing slips values

[Olivier]

Hi,

On a Asterisk 1.8.12 system working OK for months (>100k calls proceed),
users are complaining for bad audio.

My setup is:
PSTN <--E1/PRI ---> Asterisk <--- E1/PRI---> Siemens  HiPath <---E1/PRI
---> PSTN

asterisk -rx "dahdi show version"
DAHDI Version: SVN-trunk-r10414 Echo Canceller: HWEC

asterisk -rx "pri show version"
libpri version: 1.4.12



A quick glance at Asterisk logs shows lines like this:
[2014-01-09 17:19:34] NOTICE[26034]: chan_dahdi.c:3099
my_handle_dchan_exception: PRI got event: HDLC Abort (6) on D-channel of
span 1
[2014-01-09 17:19:35] NOTICE[26035]: chan_dahdi.c:3099
my_handle_dchan_exception: PRI got event: HDLC Abort (6) on D-channel of
span 2
[2014-01-09 17:19:49] NOTICE[26035]: chan_dahdi.c:3099
my_handle_dchan_exception: PRI got event: HDLC Abort (6) on D-channel of
span 2


I read an old thread inviting an admin to check for shared IRQs and timing
slips.

My questions are:

1. cat /proc/interrupts 's output is:
# cat /proc/interrupts
            CPU0       CPU1       CPU2       CPU3       CPU4
CPU5       CPU6       CPU7
   0:      90147          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          1          0          0
0          0          0   IO-APIC-edge      rtc0
   9:          0          0          0          0          0
0          0          0   IO-APIC-fasteoi   acpi
  12:          4          0          0          0          0
0          0          0   IO-APIC-edge      i8042
  14:         93          0          0          0          0
0          0          0   IO-APIC-edge      ata_piix
  15:          0          0          0          0          0
0          0          0   IO-APIC-edge      ata_piix
  16: 3378646209 3378695076 3378691115 3378697362 3378691116 3378706831
3378710635 3378702358   IO-APIC-fasteoi   wct2xxp

Can I positively conclude that my Dahdi PRI board IS NOT sharing IRQ (which
is good) ?

2. What would you suggest reading the following output ?

cat /proc/dahdi/2
Span 2: TE2/0/2 "T2XXP (PCI) Card 0 Span 2" (MASTER) HDB3/CCS
    Timing slips: 175319

      32 TE2/0/2/1 Clear (In use) (EC: VPMOCT064 - INACTIVE)
      33 TE2/0/2/2 Clear (In use) (EC: VPMOCT064 - INACTIVE)
      34 TE2/0/2/3 Clear (In use) (EC: VPMOCT064 - INACTIVE)
      35 TE2/0/2/4 Clear (In use) (EC: VPMOCT064 - INACTIVE)
      36 TE2/0/2/5 Clear (In use) (EC: VPMOCT064 - INACTIVE)
      37 TE2/0/2/6 Clear (In use) (EC: VPMOCT064 - INACTIVE)
      38 TE2/0/2/7 Clear (In use) (EC: VPMOCT064 - INACTIVE)
      39 TE2/0/2/8 Clear (In use) (EC: VPMOCT064 - INACTIVE)
      40 TE2/0/2/9 Clear (In use) (EC: VPMOCT064 - INACTIVE)
      41 TE2/0/2/10 Clear (In use) (EC: VPMOCT064 - INACTIVE)
      42 TE2/0/2/11 Clear (In use) (EC: VPMOCT064 - INACTIVE)
      43 TE2/0/2/12 Clear (In use) (EC: VPMOCT064 - INACTIVE)
      44 TE2/0/2/13 Clear (In use) (EC: VPMOCT064 - INACTIVE)
      45 TE2/0/2/14 Clear (In use) (EC: VPMOCT064 - INACTIVE)
      46 TE2/0/2/15 Clear (In use) (EC: VPMOCT064 - INACTIVE)
      47 TE2/0/2/16 HDLCFCS (In use) (EC: VPMOCT064 - INACTIVE)
      48 TE2/0/2/17 Clear (In use) (EC: VPMOCT064 - INACTIVE)
      49 TE2/0/2/18 Clear (In use) (EC: VPMOCT064 - INACTIVE)
      50 TE2/0/2/19 Clear (In use) (EC: VPMOCT064 - INACTIVE)
      51 TE2/0/2/20 Clear (In use) (EC: VPMOCT064 - INACTIVE)
      52 TE2/0/2/21 Clear (In use) (EC: VPMOCT064 - INACTIVE)
      53 TE2/0/2/22 Clear (In use) (EC: VPMOCT064 - INACTIVE)
      54 TE2/0/2/23 Clear (In use) (EC: VPMOCT064 - INACTIVE)
      55 TE2/0/2/24 Clear (In use) (EC: VPMOCT064 - INACTIVE)
      56 TE2/0/2/25 Clear (In use) (EC: VPMOCT064 - INACTIVE)
      57 TE2/0/2/26 Clear (In use) (EC: VPMOCT064 - INACTIVE)
      58 TE2/0/2/27 Clear (In use) (EC: VPMOCT064 - INACTIVE)
      59 TE2/0/2/28 Clear (In use) (EC: VPMOCT064 - INACTIVE)
      60 TE2/0/2/29 Clear (In use) (EC: VPMOCT064 - INACTIVE)
      61 TE2/0/2/30 Clear (In use) (EC: VPMOCT064 - INACTIVE)
      62 TE2/0/2/31 Clear (In use) (EC: VPMOCT064 - INACTIVE)

3. As shown above, my box has two connections with PSTN (same provider for
both): one direct, one through an HiPath PBX.
How can I double check timing slips don't come from "inconsistency between
both clock sources" ?
My first thought would be to unplug the link between Asterisk and HiPath
and compare two /pro/dahddi/1 outputs.
Thoughts ?

Regards
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