Yes a default installation of debian ( minimal/base ) also take into consideration this install was before that wiki warning regarding the  divider of the kernel HZ thingy.


2011/4/27 François Delawarde <fdelawarde@wirelessmundi.com>
Did you use the default kernel in your debian setup?

François.

On Wed, 2011-04-27 at 10:30 +0000, Antonio Teixeira wrote:
> Just a little update for you guys.
>
> I have jumped from debian to centos did a full reinstall +  Raid 1 +
> DB in Ram.
>
> And was able to get 78 Simult. Calls at only 10 % CPU so there is a
> huge difference so far from 120 % on debian :\.
> Call quality has improved , local lan call quality has rised , G729
> Licenses working again thanks Brian West !!!.
>
> I will now start to deploy our IVRs using ESL to see if i can offload
> some of the load.
>
> Regards
> A/T
>
>
> 2011/4/27 Paul Cupis <paul@cupis.co.uk>
>         On 27/04/11 01:24, Ariel Monaco wrote:
>         > We had high CPU utilization peaks in the past, which lead to
>         some
>         > audio issues (clipping). We were using debian at that time,
>         which
>         > was a customer-side requirement.
>         >
>         > I'm not a kernel guru but I remember this had something to
>         do with
>         > kernel timer cycles and the issue was address by adding
>         "divider=10"
>         > or "divider=100" as a kernel's boot loader option.
>
>
>         Interesting. This kernel option is designed to reduce the valy
>         of
>         CONFIG_HZ at run=time, so if you have a 1000Hz kernel, setting
>         divider=10 at boot time will effectively give you a 100Hz
>         kernel.
>
>         This seems to fly in the face of other recommendations on this
>         kernel
>         setting!
>
>         Debian default kernel sets CONFIG_HZ=100
>         CentOS default kernel sets CONFIG_HZ=1000
>
>         Regards,
>
>
>
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