> -----Original Message-----
> ________________________________
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-
> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Jamie J. Begin
> Sent: June 10, 2008 1:12 PM
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] Missed interrupt. Increasing latency to 5 ms in
> orderto compensate.
>
> I am using pciback to pass a Digium PCIX analog telephony card to an
> Asterisk domU. Seemingly at random times, the card wigs out with the
> following appended to my /var/log/messages:
>
> Jun 10 12:17:19 asterisk01 kernel: wctdm24xxp0: Missed interrupt.
> Increasing latency to 4 ms in order to compensate.
> Jun 10 14:01:01 asterisk01 kernel: wctdm24xxp0: Missed interrupt.
> Increasing latency to 5 ms in order to compensate.
>
> This is becoming a major problem because it will drop any active calls and
> refuse to accept new calls until I stop Asterisk, remove and then re-add
> the kernel module, and finally restart Asterisk. I don't know whether the
> drivers, Xen, the motherboard/BIOS, or Asterisk is to blame. However,
> this did not occur until after I virtualized the server. Does anyone have
> any suggestions? This is killing me here.
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-
> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of [STD]Ein
> Sent: Tuesday, June 10, 2008 10:32 PM
> To: 'Jamie J. Begin'; xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-users] Missed interrupt. Increasing latency to 5 ms
> inorderto compensate.
>
> Is it possible the cpu(s) are being taxed? If they are under heavy load
> (from another domain most likely) it may cause the domain to not respond
> to interrupts in a timely manner. If this is the case, you might try
> changing the scheduling weights of your domains (search the list).
>
Thanks for the suggestion; unfortunately I wish it were that easy. The
physical machine is a brand new Dell Poweredge 1650 III with a quad-core
Xeon and 2 GB of RAM. The Asterisk domU is the only domU currently running.
It is allocated two of the cores and rarely gets above a 0.04 load average
throughout the day since it's only processing 2-3 voice channels at any
given time.
I've been in this business long enough to know that "random" problems are
rarely random but I'm having difficulty connecting the dots. This problem
can occur during the weekend when the system is idle, or in the middle of a
phone call on a Monday afternoon.
I'm thinking it may somehow be an IRQ conflict. The card doesn't seem to
share an IRQ with anything; but it looks to have been assigned IRQ 18, which
seems rather odd. I haven't played around with any of the APIC kernel
options because I'm not that familiar with them. Here's some output that
may be useful:
"lspci" from the dom0:
0b:08.0 Ethernet controller: Digium, Inc. Unknown device 8002 (rev 11)
Subsystem: Digium, Inc. Unknown device 8002
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 32 (16000ns min, 32000ns max), Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 18
Region 0: I/O ports at dc00 [size=256]
Region 1: Memory at fc7dfc00 (32-bit, non-prefetchable) [size=1K]
Expansion ROM at fc7e0000 [disabled] [size=128K]
Capabilities: [c0] Power Management version 2
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
PME(D0+,D1+,D2+,D3hot+,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
"cat /proc/interrupts" from dom0.
CPU0 CPU1 CPU2 CPU3
1: 2 0 0 0 Phys-irq i8042
8: 0 0 0 0 Phys-irq rtc
9: 0 0 0 0 Phys-irq acpi
12: 4 0 0 0 Phys-irq i8042
17: 31664532 0 0 94 Phys-irq megasas,
peth0
19: 446716 2870 5 36 Phys-irq eth2
20: 25613484 0 1305 0 Phys-irq
uhci_hcd:usb1, ehci_hcd:usb2
256: 102837808 0 0 0 Dynamic-irq timer0
257: 2439233 0 0 0 Dynamic-irq resched0
258: 43 0 0 0 Dynamic-irq callfunc0
259: 0 634445 0 0 Dynamic-irq resched1
260: 0 126 0 0 Dynamic-irq callfunc1
261: 0 13329219 0 0 Dynamic-irq timer1
262: 0 0 559915 0 Dynamic-irq resched2
263: 0 0 120 0 Dynamic-irq callfunc2
264: 0 0 6024225 0 Dynamic-irq timer2
265: 0 0 0 1626891 Dynamic-irq resched3
266: 0 0 0 101 Dynamic-irq callfunc3
267: 0 0 0 31030283 Dynamic-irq timer3
268: 4234 0 0 0 Dynamic-irq xenbus
269: 0 0 0 0 Dynamic-irq console
270: 378 0 0 0 Dynamic-irq pciback
271: 89831 2843 2883 15 Dynamic-irq
blkif-backend
272: 4164194 24455 22095 4105 Dynamic-irq vif1.0
273: 60758 7524 5516 50 Dynamic-irq
blkif-backend
274: 694799 3497036 2722 8 Dynamic-irq vif6.0
NMI: 0 0 0 0
LOC: 0 0 0 0
"cat /proc/interrupts" from the Asterisk domU:
CPU0 CPU1
18: 577477891 0 Phys-irq wctdm24xxp0
256: 78034763 0 Dynamic-irq timer0
257: 59661 0 Dynamic-irq resched0
258: 38 0 Dynamic-irq callfunc0
259: 409 0 Dynamic-irq xenbus
260: 0 73103 Dynamic-irq resched1
261: 0 70 Dynamic-irq callfunc1
262: 0 3942339 Dynamic-irq timer1
263: 409 1 Dynamic-irq xencons
264: 113336 10469 Dynamic-irq blkif
265: 8317410 0 Dynamic-irq eth0
NMI: 0 0
LOC: 0 0
ERR: 0
MIS: 0
_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users
|
Home