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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Thanks a lot, Gertjan. I appreciate to hear from your experiments.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I'm still considering whether to go with the open PTPd or a
commercial version such as IXXAT.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>At this time, I'm a bit inclining to IXXAT because of its support
for IPv6 (with a software module extension). I will check if it's possible to
modify their code and if their commercial license takes care of the
inherent license/royalty fees for using IEEE 1588-2008 algorithm and patents. Ease
of integration, especially for the time-stamping interface component, is a
critical factor.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Daniel<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> gertjan hofman
[mailto:ghofman@gmail.com] <br>
<b>Sent:</b> Friday, April 06, 2012 3:34 AM<br>
<b>To:</b> Daniel Le<br>
<b>Cc:</b> Ronciak, John; ptpd@lists.infradead.org<br>
<b>Subject:</b> Re: [ptpd - Help] Questions on products and licensing<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Daniel,<o:p></o:p></p>
<div>
<p class=MsoNormal><o:p> </o:p></p>
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<div>
<p class=MsoNormal>We have a similar issue - our ARM based DAQ boards are
running a 2.6.30 & Debian Lenny and there is no point trying to upgrade -
we have had to make a fair number of kernel changes to support our board
hardware.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>I dont completely remember why we preferred the openptpd.
I seem to recall that I found it actually easier to understand. The IXXAT
code was written in a more general structure perhaps but harder to follow.
Experiments showed no difference, or worse, synchronization
convergence. There might also have something about the way OpenPTP was
using a kernel feature to timestamp the outgoing packet using the loop back
interface (I could be quite wrong here....I believe this is documented in the
older Openptp mailing list on source forge) and IXXAT was not. While we
were still deciding whether we could make 1588 work for us, I already knew I
had to modify the OpenPTP code and I could not do this with the IXXAT code that
we had not yet paid for. I added a lot of extra filtering on the Master
to Slave Delay, which was showing non-stochastic spikes. We also added
VLAN capabilities so that our switches would route 1588 before any other
traffic (this really helped). We send packets every 250 ms rather than
the official PTP v1 limit of 1 second. I documented this is a previous
e-mail to this mailing list about 2-3 years ago.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
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<div>
<p class=MsoNormal>On the other hand....IXXAT supports 1588 V2 (now - it didnt
at the time). They were a good company to deal with, generous with
lending their code. Presumably they solve the licencing problem for you.
These are all worth while advantages in a corporate environment.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>Cheers<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><br>
Gertjan<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p>
<div>
<p class=MsoNormal>On Fri, Apr 6, 2012 at 10:48 AM, Daniel Le <<a
href="mailto:daniel.le@exfo.com">daniel.le@exfo.com</a>> wrote:<o:p></o:p></p>
<div>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>>
I evaluated it about 3 years and decided that the open source version had some
advantages.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Would
you mind to share the advantages of the ptpd open source code from your
evaluation? Are there issues with Ixxat IEEE 1588-2008 protocol stack? I
generally go with open source code, but this time I hesitate because ptpd does
not support IPv6 and there is no indication it will soon. Commercial product
also provides more support (at a cost).</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>WRT
kernel 3.X, my embedded platform currently uses 2.6.35.7 and a kernel upgrade
is not quick job as it involves re-testing of all applications and
infrastructure code.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Regards,</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Daniel</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p>
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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> <a
href="mailto:ptpd-bounces@lists.infradead.org" target="_blank">ptpd-bounces@lists.infradead.org</a>
[mailto:<a href="mailto:ptpd-bounces@lists.infradead.org" target="_blank">ptpd-bounces@lists.infradead.org</a>]
<b>On Behalf Of </b>Ronciak, John<br>
<b>Sent:</b> Thursday, April 05, 2012 6:05 PM<br>
<b>To:</b> gertjan hofman; <a href="mailto:ptpd@lists.infradead.org"
target="_blank">ptpd@lists.infradead.org</a><br>
<b>Subject:</b> RE: [ptpd - Help] Questions on products and licensing</span><o:p></o:p></p>
</div>
</div>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>>
Not entirely sure what you mean. Ixxat has had a commercial version for 5
years, see:<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>>
<a href="http://www.ixxat.com/ieee-1588-stack-v2_en.html" target="_blank">http://www.ixxat.com/ieee-1588-stack-v2_en.html</a><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>>
I evaluated it about 3 years and decided that the open source version had some
advantages.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Yes
but I was only pointing out the Linux project stuff. Commercial versions
have been around a long time. The Linux one not really that long until
now in the Linux kernel.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>>
The kernel implementation came too late for us - I should dig into it some
more. I seem to recall there was strong <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>>
reluctance at Red Hat to distribute it due to the patents issues. Is this no
longer true ?<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Since
it is part of the kernel I’m assuming not. I don’t speak in
any way for RH. As of yet RH has not released a kernel based on a version
that support PTP. That will change as the next major release happen from
them. It will be based on a kernel that supports it.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Cheers,</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>John</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p>
<div style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'>
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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> gertjan hofman
[mailto:<a href="mailto:ghofman@gmail.com" target="_blank">ghofman@gmail.com</a>]
<br>
<b>Sent:</b> Thursday, April 05, 2012 2:48 PM<br>
<b>To:</b> <a href="mailto:ptpd@lists.infradead.org" target="_blank">ptpd@lists.infradead.org</a><br>
<b>Cc:</b> Ronciak, John<br>
<b>Subject:</b> [ptpd - Help] Questions on products and licensing</span><o:p></o:p></p>
</div>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>John,<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Not
entirely sure what you mean. Ixxat has had a commercial version for 5
years, see:<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><a
href="http://www.ixxat.com/ieee-1588-stack-v2_en.html" target="_blank">http://www.ixxat.com/ieee-1588-stack-v2_en.html</a><o:p></o:p></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>I
evaluated it about 3 years and decided that the open source version had some
advantages.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Re
license - yes, use of the 1588 protocol, regardless of the hard/software
will always fall under the Lucent license - at least that is the understanding
of the lawyers of the company I work for. Cost are not prohibitive.<o:p></o:p></p>
</div>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>The
kernel implementation came too late for us - I should dig into it some more. I
seem to recall there was strong reluctance at Red Hat to distribute it due to
the patents issues. Is this no longer true ?<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Cheers<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Gertjan<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><br
clear=all>
<o:p></o:p></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>--
<br>
==================================================<br>
Gertjan Hofman<br>
ghofman [at] <a href="http://gmail.com" target="_blank">gmail.com</a> <br>
<br>
<a href="tel:604-982-3574" target="_blank">604-982-3574</a><br>
==================================================<o:p></o:p></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p>
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