[asterisk-ss7] Poor dahdi_test results

[bipin singh]

Hi ,
               Find the dahdi-2.5.1 log
 99.615% 99.993% 99.994% 99.994% 99.994% 99.995% 99.994% 99.994%
99.994% 99.994% 99.994% 99.994% 99.994% 99.994% 99.995% 99.994%
99.994% 99.994% 99.994% 99.994% 99.995% 99.991% 99.994% 99.994%
99.994% 99.994% 99.994% 99.995% 99.992% 99.980% 99.995% 99.994%
99.604% 99.994% 99.995% 99.994% 99.994% 99.620% 99.609% 99.994%
99.994% 99.994% 99.994% 99.615% 99.994% 99.994% 99.993% 99.987%
99.994% 99.994% 99.994% 99.994% 99.995% 99.995% 99.994% 99.995%
99.994% 99.994% 99.918% 99.905% 99.995% 99.993% 99.994% 99.994%
99.994% 99.994% 99.994% 99.994% 99.994% 99.994% 99.995% 99.994%
99.993% 99.994% 99.995% 99.994% 99.994% 99.994% 99.994% 99.994%
99.995% 99.994% 99.994% 99.994% 99.995% 99.993% 99.615% 99.994%
99.994% 99.994% 99.994% 99.994% 99.994% 99.994% 99.604% 99.994%
99.995% 99.993% 99.995% 99.994% 99.994% 99.994% 99.994% 99.995%
99.994% 99.995% 99.994% 99.994% 99.994% 99.994% 99.996% 99.992%
99.994% 99.994% 99.994% 99.994% 99.994% 99.994% 99.994% 99.994%
99.996% 99.991% 99.995% 99.995% 99.993% 99.994% 99.994% 99.994%
99.614% 99.992% 99.997% 99.991% 99.994% 99.993% 99.995% 99.994%
99.995% 99.993% 99.994% 99.994% 99.995% 99.994% 99.994% 99.995%
99.993% 99.994% 99.995% 99.993% 99.995% 99.995% 99.994% 99.994%
99.995% 99.999% 99.989% 99.995% 99.993% 99.994% 99.994% 99.994%
99.604% 99.994% 99.994% 99.994% 99.994% 99.994% 99.998% 99.991%
99.994% 99.994% 99.993% 99.615% 99.994% 99.994% 99.994% 99.995%
99.994% 99.994% 99.994% 99.994% 99.995% 99.994% 99.994% 99.994%
99.995% 99.995% 99.994% 99.994% 99.994% 99.994% 99.995% 99.994%
99.994% 99.994% 99.994% 99.994% 99.994% 99.994% 99.995% 99.995%
99.994% 99.994% 99.995% 99.993% 99.994% 99.993% 99.995% 99.992%
99.995% 99.994% 99.994% 99.994% 99.994% 99.994% 99.615% 99.994%
99.994% 99.993% 99.994% 99.995% 99.995% 99.994% 99.995% 99.994%
99.995% 99.993% 99.994% 99.604% 99.993% 99.994% 99.994% 99.736%
99.723% 99.993% 99.995% 99.994% 99.994% 99.994% 99.994% 99.994%
99.994% 99.992% 99.994% 99.994% 99.998% 99.991% 99.992% 99.994%
99.993% 99.993% 99.994% 99.994% 99.994% 99.995% 99.994% 99.994%
99.994% 99.616% 99.995% 99.994% 99.994% 99.994% 99.995% 99.995%
99.994% 99.994% 99.995% 99.993%
--- Results after 1204 passes ---
Best: 100.000 -- Worst: 97.650 -- Average: 99.970143, Difference: 99.997439


On Thu, Sep 29, 2011 at 10:19 PM, Shaun Ruffell <sruffell at digium.com> wrote:

> On Wed, Sep 21, 2011 at 11:37:47AM -0700, Ryan Crowder wrote:
> > I'm installing it this afternoon.  I'll report back if I notice any
> > problems.
> >
> > -----Original Message-----
> > From: asterisk-ss7-bounces at lists.digium.com
> > [mailto:asterisk-ss7-bounces at lists.digium.com] On Behalf Of Shaun
> > Ruffell
> > Sent: Wednesday, September 21, 2011 11:35 AM
> > To: asterisk-ss7 at lists.digium.com
> > Subject: Re: [asterisk-ss7] Poor dahdi_test results
> >
> > On Tue, Sep 20, 2011 at 01:13:34PM -0700, Ryan Crowder wrote:
> > > # chrt -f 99 dahdi_test -v -c 5
> > > Opened pseudo dahdi interface, measuring accuracy...
> > >
> > > 8192 samples in 8159.824 system clock sample intervals (99.607%)
> > > 8192 samples in 8239.544 system clock sample intervals (100.580%)
> > > 8192 samples in 8159.856 system clock sample intervals (99.608%)
> > > 8192 samples in 8159.833 system clock sample intervals (99.607%)
> > > 8192 samples in 8239.856 system clock sample intervals (100.584%)
> > > --- Results after 5 passes ---
> > > Best: 99.608 -- Worst: 99.416 -- Average: 99.531525, Difference:
> > > 99.997346
> >
> > Still strange. Although, since the overall result is 99.9x% range I
> > do not believe you will have any problems in this configuration.
> > Data is not being dropped, it is just that there is a delay when
> > it's being delivered to user space or the clock on your system is
> > jumping around slightly.
>
> Ryan,
>
> This is a heads up for you.  I was looking into something else
> recently that I think explains what you were seeing in this thread.
>
> dahdi-linux 2.5.0.1 has a regression where, for digital cards, a
> master span may not be selected on initial configuration. If this is
> the case, even though you have a card installed / configured, the
> core timer would process your timers and they run somewhere between
> a 4ms and 10ms interval depending on the HZ setting in the kernel.
>
> http://svnview.digium.com/svn/dahdi?view=revision&revision=10205
>
> I bet if you checkout the current 2.5 branch of DAHDI-linux and test
> with that, you will see more precision in the dahdi_test results.
> You could also verify this is what you were seeing by putting the
> span in loopback and then taking it out to have the driver rescan
> for a master span.
>
> For what it's worth,
> Shaun
>
> --
> Shaun Ruffell
> Digium, Inc. | Linux Kernel Developer
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
> Check us out at: www.digium.com & www.asterisk.org
>
> --
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-- 
BIPIN RAGHUVANSHI
OPERATION HEAD
ASTERISK (DEVELOPMENT AND RESEARCH)
WWW.EHORIZONS.IN
011-32323262
011-46334633
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