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
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