[asterisk-ss7] MTP2 CRC errors resulting in flapping link

[email_de_tomas_peralta_tormey-ss7 at yahoo.com.ar]

Hello:
A good way to know if your card is losing IRQs is too
use the tool "zttol" that comes with zaptel.

Greetings, Tomás.

 --- Kai Militzer <km at westend.com> escribió:

> Hi,
> 
> Paul Cadach wrote:
> > You mix CRC4 (which is used to check CAS
> signalling/framing consistency) and
> > CRC16/CRC32 (which is used to check HDLC frame
> consistency).
> 
> > Looks like interrupt/CPU load is high which causes
> raw time slot data looses.
> 
> The assumption with a lot of interrupts causing this
> problem seems to be 
> right. See the following output of vmstat (the first
> is the system with 
> the problems, the second a system without the
> problem (also running 
> chan_ss7)). On the system with the problem there is
> a mass of interrupts.
> 
> ss7-gate1:~# vmstat -n 1
> procs -----------memory---------- ---swap--
> -----io---- --system-- 
> ----cpu----
>   r  b   swpd   free   buff  cache   si   so    bi  
>  bo   in    cs us 
> sy id wa
>   0  0      0   9260  82860 862476    0    0     2  
>   2    3     4  0 
> 1 98  0
>   0  0      0   9260  82860 862476    0    0     0  
>   0 2014     0  0 
> 0 100  0
>   1  1      0   9260  82868 862468    0    0     0  
>  80 2169     0  0 
> 1 99  0
>   0  0      0   9260  82868 862468    0    0     0  
>   0 2019     0  0 
> 0 100  0
>   0  0      0   9260  82868 862468    0    0     0  
>  48 2104     0  0 
> 1 99  0
>   0  0      0   9260  82868 862468    0    0     0  
>   0 2009     0  3 
> 5 92  0
>   0  0      0   9260  82868 862468    0    0     0  
>   0 2006     0  0 
> 7 93  0
>   0  0      0   9260  82868 862468    0    0     0  
> 236 2481     0  2 
> 3 95  0
>   0  0      0   9260  82868 862468    0    0     0  
>   0 2007     0  0 
> 0 100  0
>   0  0      0   9196  82868 862468    0    0     0  
>  60 2129     0  0 
> 0 98  1
>   0  0      0   9196  82868 862468    0    0     0  
>   0 2007     0  0 
> 0 100  0
> 
> 
> ss7-gate2:~# vmstat -n 1
> procs -----------memory---------- ---swap--
> -----io---- --system-- 
> ----cpu----
>   r  b   swpd   free   buff  cache   si   so    bi  
>  bo   in    cs us 
> sy id wa
>   4  0      0   5572  54844 142156    0    0     9  
>   8   10    10  3 
> 8 89  0
>   0  0      0   5572  54844 142156    0    0     0  
>   0    0     0  1 
> 1 98  0
>   0  0      0   5572  54844 142156    0    0     0  
>   0    0     0  8 
> 35 57  0
>   0  0      0   5572  54844 142156    0    0     0  
>   0    0     0  0 
> 0 100  0
>   0  0      0   5572  54844 142156    0    0     0  
>   0    0     0  0 
> 0 100  0
>   0  0      0   5572  54848 142156    0    0     0  
>  40    0     0  0 
> 0 100  0
>   0  0      0   5588  54848 142156    0    0     0  
>   0    0     0  0 
> 0 100  0
>   0  0      0   5588  54848 142156    0    0     0  
>   0    0     0  1 
> 1 98  0
>   0  0      0   5588  54848 142156    0    0     0  
>   0    0     0  7 
> 36 57  0
>   0  0      0   5588  54848 142156    0    0     0  
>   0    0     0  0 
> 0 100  0
> 
> And here the interrupts:
> 
> ss7-gate1:/var/log/asterisk# cat /proc/interrupts
>             CPU0       CPU1
>    0:  986934556          0    IO-APIC-edge  timer
>    1:       1649          0    IO-APIC-edge  i8042
>    7:          2          0    IO-APIC-edge 
> parport0
>    9:          0          0   IO-APIC-level  acpi
>   14:  182607673        347    IO-APIC-edge  ide0
>   50:          0          0         PCI-MSI  pciehp
> 177:          0          0   IO-APIC-level  uhci_hcd
> 185:          0          0   IO-APIC-level 
> uhci_hcd, ehci_hcd
> 193:  986078651          0   IO-APIC-level 
> uhci_hcd, wct2xxp
> 201:          0          0   IO-APIC-level  uhci_hcd
> 209:    2640734          0   IO-APIC-level  eth1
> 225:   23208735          0   IO-APIC-level  eth0
> NMI:          0          0
> LOC:  986900234  986900230
> ERR:          0
> MIS:          0
> 
> Regards,
> Kai
> 
> -- 
> Kai Militzer                 WESTEND GmbH  | 
> Internet-Business-Provider
> Technik                      CISCO Systems Partner -
> Authorized Reseller
>                               Lütticher Straße 10   
>   Tel 0241/701333-14
> km at westend.com               D-52064 Aachen         
>     Fax 0241/911879
> 
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