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.<br><br><br><div class="gmail_quote">2011/4/27 François Delawarde <span dir="ltr"><<a href="mailto:fdelawarde@wirelessmundi.com">fdelawarde@wirelessmundi.com</a>></span><br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">Did you use the default kernel in your debian setup?<br>
<font color="#888888"><br>
François.<br>
</font><div><div></div><div class="h5"><br>
On Wed, 2011-04-27 at 10:30 +0000, Antonio Teixeira wrote:<br>
> Just a little update for you guys.<br>
><br>
> I have jumped from debian to centos did a full reinstall + Raid 1 +<br>
> DB in Ram.<br>
><br>
> And was able to get 78 Simult. Calls at only 10 % CPU so there is a<br>
> huge difference so far from 120 % on debian :\.<br>
> Call quality has improved , local lan call quality has rised , G729<br>
> Licenses working again thanks Brian West !!!.<br>
><br>
> I will now start to deploy our IVRs using ESL to see if i can offload<br>
> some of the load.<br>
><br>
> Regards<br>
> A/T<br>
><br>
><br>
> 2011/4/27 Paul Cupis <<a href="mailto:paul@cupis.co.uk">paul@cupis.co.uk</a>><br>
> On 27/04/11 01:24, Ariel Monaco wrote:<br>
> > We had high CPU utilization peaks in the past, which lead to<br>
> some<br>
> > audio issues (clipping). We were using debian at that time,<br>
> which<br>
> > was a customer-side requirement.<br>
> ><br>
> > I'm not a kernel guru but I remember this had something to<br>
> do with<br>
> > kernel timer cycles and the issue was address by adding<br>
> "divider=10"<br>
> > or "divider=100" as a kernel's boot loader option.<br>
><br>
><br>
> Interesting. This kernel option is designed to reduce the valy<br>
> of<br>
> CONFIG_HZ at run=time, so if you have a 1000Hz kernel, setting<br>
> divider=10 at boot time will effectively give you a 100Hz<br>
> kernel.<br>
><br>
> This seems to fly in the face of other recommendations on this<br>
> kernel<br>
> setting!<br>
><br>
> Debian default kernel sets CONFIG_HZ=100<br>
> CentOS default kernel sets CONFIG_HZ=1000<br>
><br>
> Regards,<br>
><br>
><br>
><br>
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