[Freeswitch-users] Delays on VirtualMachines vs baremetal

[Daniel Ivanov]

Good posting Marcus. I will try to investigate further what our VMs are
using , as we are only renting them and don't have host control.


On Wed, Jun 25, 2014 at 11:37 AM, Markus Lindenberg <
markus.lindenberg at gmail.com> wrote:

> Hi Daniel,
>
> I'm running FreeSWITCH on KVM (Debian 7 Guest / Proxmox hosts and RHEL 6
> hosts) without problems, even conferences and softfax (stuff where I assume
> timing is more critical) works very well. I exercised some caution when
> configuring the VM though, I don't know if all those things are necessary,
> best practice or even useful, but they result from some experience with
> strange timing in VMs:
>
> I have set up mod_timerfd, although I don't know if it's any different
> from using enable-softtimer-timerfd in core:
>
> freeswitch at default> show timer
> type,name,ikey
> timer,soft,CORE_SOFTTIMER_MODULE
> timer,timerfd,mod_timerfd
>
> My guest kernel supports linking the guest clock source to the host, so I
> don't have any issues with clock drifting away and don't need NTP in the
> guest. Maybe this also affects FreeSWITCH's ability to keep time?
>
> root at freeswitch:~# cat
> /sys/devices/system/clocksource/clocksource0/current_clocksource
> kvm-clock
>
> On systems that don't need the CPU power, I make sure only one virtual CPU
> exists and/or pin the guest CPUs to host CPUs.
>
> Maybe the most useful thing to check is to switch the virtual NIC in KVM,
> I usually try to use virtio where possible, but hat strange issues before
> (like a DHCP Server VM not seeing DISCOVERs with virtio NIC while the same
> VM with e1000 worked fine). So, maybe try to switch NIC type and see if it
> helps. Currently I'm using FreeSWITCH on both e1000 and virtio without
> issues.
>
> Regards, Markus
>
>
>
>
> On Tue, Jun 24, 2014 at 3:45 PM, Daniel Ivanov <sertys at gmail.com> wrote:
>
>> KVM virtual machines, running centos5
>>
>>
>> On Tue, Jun 24, 2014 at 2:55 PM, Brian West <brian at freeswitch.org> wrote:
>>
>>> What are you running on?
>>>
>>> Sent from my iPhone
>>>
>>> > On Jun 24, 2014, at 7:41 AM, Daniel Ivanov <sertys at gmail.com> wrote:
>>> >
>>> > I am running multiple FS nodes on virtualmachines and sometimes am
>>> getting choppy audio and network delays when network conditions are
>>> perfect. Do you think it's worth migrating the instances to bare metal and
>>> will i notice improvement in call quality?
>>> >
>>> _________________________________________________________________________
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>>> > 
>>> > 
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>>
>>
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>> http://www.freeswitchsolutions.com
>>
>> 
>> 
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>
> _________________________________________________________________________
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> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> 
> 
>
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>
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