RE: [Xen-users] Missed interrupt. Increasing latency to 5 ms in orderto compensate.

["Jamie J. Begin" <begin@xxxxxxxxxxxxxxx>]

Yes, it's a possibility that I have reluctantly considered.  My reason for
virtualizing it is primarily because the hardware is going to be so
underutilized as simply a VoIP server--and I seem to have come so close to
making it work properly. :-\

But as you correctly guessed, I am walking a management tightrope here with
this project.  It may just not be worth it.

Thanks for the input.

> -----Original Message-----
> From: C. Mylonas (Mr VoIP) [mailto:chris@xxxxxxxxxxxxx]
> Sent: Wednesday, June 11, 2008 1:58 AM
> To: Jamie J. Begin
> Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] Missed interrupt. Increasing latency to 5 ms in
> orderto compensate.
> 
> Dear Jamie,
> 
> I would not be putting telephony onto virtual infrastructure in a
> production environment period.
> If you are looking after this system, and are able to put it back onto a
> physical server, it's not worth the stress of it, especially when using
> the switching network through telephony interface cards.
> 
> As soon as your system chokes, you'll have XX amount of users hurling
> abuse at the phones or yourself, and management will look badly on the
> whole virtualisation thing you're trying to achieve with Xen.
> 
> Chris
> 
> 
> On Wed, Jun 11, 2008 at 12:32 PM, [STD]Ein <ein@xxxxxxxxxxxxxx> wrote:
> 
> 
>       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).
> 
> 
> 
> 
> ________________________________
> 
> 
>       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.
> 
> 
>       _______________________________________________
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>       Xen-users@xxxxxxxxxxxxxxxxxxx
>       http://lists.xensource.com/xen-users
> 
> 
> 
> 
> 
> --
> Kind Regards,
> Chris Mylonas
> Engineer


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