On Thu, Mar 29, 2012 at 9:15 PM, Federico Fanton wrote:
> Hi everyone!
> We have an Hylafax 5.2.5 CentOS 5 installation hosted inside a Xen virtual
> machine. It works quite well, but now I'm in the process of
> upgrading/migrating it to a KVM virtual machine running Ubuntu 10.04.
>
> The problem I'm having is that - while receiving works fine - sending faxes
> is extremely unreliable, I get lots of "No response to MPS repeated 3
> tries", or "Failure to transmit clean ECM image data", just what would
> happen if the phone line was noisy.
>
> Since the line, modem and configuration files I'm using are the same as
> before, I thought that it could be a KVM scheduling issue, but even setting
> cpu_shares to 10240 instead of 1024 doesn't change a thing...
>
> I've tried asking on the Hylafax ML, and they say that
>
> "generally speaking I'm very skeptical of real-time performance for
> virtualized machines and especially virtualized serial hardware. Because fax
> is time-sensitive it's certainly possible for the virtual machine to not be
> attentive-enough to it."
>
> Are there any success stories on running Hylafax on KVM? What could I try to
> make it more "attentive"?
>
>
> Here's how I'm mapping the serial port (where the modem is connected):
>
>
>
>
>
>
>
> And how I tuned the VM:
>
>
> 10240
> 10
> -1
>
>
>
> Many thanks for your time!
>
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I've run hylafax under KVM in guest without any problems.
( not sure about configuration - since have no longer access to that site )
I think I've been using USB-2-serial adapter. and run kvm without libvirt
--
--
Michael
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