[Freeswitch-users] Commercial Fax over T.30 for FreeSWITCH

[John]

Ubuntu default timer for the server kernel is 100Hz (although I haven't
checked 12.04).  You need the -preempt kernel for low latency and
1000Hz.  It's easy to apt-get install; you then need to tweak the GRUB
config to make it your default kernel on (re)boot.

John

On 03/05/12 16:19, Paul Cupis wrote:
> On Thu, May 03, 2012 at 05:53:01PM +0530, Anita Hall wrote:
>>    No, I am running FreeSWITCH on an Ubuntu 64-bit Quad core machine.
>>    There is no VM.
>>    What all things should I check to ensure that the timing on my system
>>    is good? Like, may be, my motherboard is bad or my kernel could be
>>    tuned better ?
> The most common suggestion is to use a kernel with 1000Hz timer. I think
> that the default timer for Ubuntu is 250, so this would be first thing
> to check/change.
>
> You can check by running:
>
>      grep CONFIG_HZ= /boot/config-`uname -r`
>
> and if it is not 1000, it would be worth installing a 1000Hz kernel
> and re-testing.
>
> Ubuntu may have a packages -lowlatency kernel which has a 1000Hz timer
> but this will also have other changes. I think a lot of people will
> compile a custom kernel based on the standard Ubuntu one, just changing
> that one configuration option.
>
> Regards,
>
>
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