[Spce-user] CPU timing in virtual enviroments

Walter Klomp walter at myrepublic.net
Wed Jan 17 03:49:00 EST 2018


I have had no such problems on virtual hardware. Just make sure you load the dahdi module and make sure asterisk uses it (which it should by default if it’s loaded in kernel).

Look here:
https://wiki.asterisk.org/wiki/display/AST/Timing+Interfaces <https://wiki.asterisk.org/wiki/display/AST/Timing+Interfaces>


> On 16 Jan 2018, at 11:37 PM, Matthew Ogden <matthew at ogden.co.za> wrote:
> Hi All
> I know this is question is not completely SPCE related, but since Sipwise is using asterisk as a component, and more importantly, since so many of of the SPCE users understand those components, not just asterisk, I thought it an interesting enough question for the community.
> All my own servers are are Virtual. Whether they be Asterisk or SPCE.  I use VMWare as the hypervisor.
> in my instance, SPCE does not seem to have a problem with timing, because the media relay can actually have small amounts of jitter and the edge devices (phones or PBXs), are sorting this out.
> But in asterisk case, most things also work fine for boxes that run asterisk. Except for conferencing. In my case, Meetme seems to work better than conf-bridge (bad quality on meetme, but unusable on conf-bridge)
> I know that in asterisk case the timer options are available instead of dadhi cards. I know that Linux can have different time resolutions of the kernel, though more modern systems system tro default to 10ms anyhow.
> Does anyone out there consider themselves as a definitive guide on the subject? I know that the Sipwise guys and anyone else contributing to media relay projects probably see this as incredibly simple, but to me, I doesn't make sense that with all the new hardware available based around virtualization, to be able to have reliable timing sources or small enough timing resolutions to take 2x  20ms packets align, merge their sound them and send them to other system. 
> Kind Regards
> Matthew Ogden
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> Spce-user at lists.sipwise.com
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