all centos 5 kernels are 1000hz with tick, only their xen version are 250hz with tick. If you look around you find a 1000hz kernel for centos xen too On Fri, May 6, 2011 at 7:40 PM, Ognjen Seslija <oseslija@gmail.com> wrote:
5.6 has 1000HZ set and so do 5.4 and 5.5 on my machines.
On Fri, May 6, 2011 at 3:30 PM, Brett Maxfield <brett.maxfield+freeswitch@gmail.com> wrote:
Hi List,
I have been looking for a small SOHO software switch to manage one or two phone extensions to initially one upstream SIP provider.
I have installed the demo/example system on a few pieces of hardware which while are not high end, nevertheless are OK considering the very small capacity required for a SOHO system, and me wanting to reserve my better hardware for more high end loads. The embedded fanless system i have runs ok, but the voice for the test IVR is very choppy, and the same choppy result on a atom dual core net-top (both centos 5.6). I understand that tuning is a complex issue on a non-RT system such as Linux, and so FreeSWITCH is probably only tuned for high end systems. This choppiness, specifically on low end systems, is "mentioned" in previous list discussions as being a timer granularity issue with the kernel.
I've had some googling around and it seems that the newest centos version supported by FreeSWITCH is CentOS 5.3, perhaps due to issues with timer resolution in newer kernels. The stock kernel for 5.4 and 5.5 does not appear to have a 1000Hz kernel, from what i can see, and xen stock kernels that i have seen have 250Hz, which is different again, and would also be a problem for FreeSWITCH running in a xen guest.
So my question is, given the contentious issue this seems to have been in the past, should i even bother trying/using FreeSWITCH for these sorts of SOHO / low end systems ?
Is there any plan to make FreeSWITCH tunable (in a non-default way) for low end SOHO systems, which might have a typical 3-4 (say 10 at max) connections, rather than being tuned for 100's or even 1000's of connections by default.
From what i have seen i quite like FreeSWITCH, and would like to run it for both SOHO and learning purposes.
I note that centos 5.6 does not explicitly mention CONFIG_HZ_* anymore in the kernel config (/boot/config-2.6.18-238.9.1.el5.centos.plus), but it does appear to have support for HPET :
CONFIG_HPET_TIMER=y CONFIG_HPET_EMULATE_RTC=y CONFIG_TICK_DIVIDER=y
There was talk of high resolution timer patches for kernel 2.6.17, and hpet timers seem to be present in the 2.6.18 kernel, at least in centos 5.6 above (i have not checked previous versions).
Given the increasing availability of HPET timers in newer kernels, could features such as nanosleep() and HPET timers be used to avoid the problems with the kernel's timer granularity / HZ issues ?
Cheers Brett
_______________________________________________ FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
_______________________________________________ FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
-- Sincerely, Giovanni Maruzzelli Cell : +39-347-2665618