Daniel,<div><br></div><div>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.</div>
<div><br></div><div>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.</div>
<div><br></div><div>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.</div>
<div><br></div><div>Cheers</div><div><br>Gertjan</div><div><br></div><div><br><br><div class="gmail_quote">On Fri, Apr 6, 2012 at 10:48 AM, Daniel Le <span dir="ltr"><<a href="mailto:daniel.le@exfo.com">daniel.le@exfo.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div lang="EN-US" link="blue" vlink="purple">
<div><div class="im">
<p class="MsoNormal">> I evaluated it about 3 years and decided that the open
source version had some advantages.<u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
</div><p class="MsoNormal"><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).<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><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.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Regards,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Daniel<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
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<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"">
<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<u></u><u></u></span></p>
</div>
</div><div><div class="h5">
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">> Not entirely sure what you mean. Ixxat has had a
commercial version for 5 years, see:<u></u><u></u></p>
<p class="MsoNormal">> <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><u></u><u></u></p>
<p class="MsoNormal">> I evaluated it about 3 years and decided that the open
source version had some advantages.<u></u><u></u></p>
<p class="MsoNormal"><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.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal">> The kernel implementation came too late for us - I
should dig into it some more. I seem to recall there was strong <u></u><u></u></p>
<p class="MsoNormal">> reluctance at Red Hat to distribute it due to the
patents issues. Is this no longer true ?<u></u><u></u></p>
<p class="MsoNormal"><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.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Cheers,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">John<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
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<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:<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<u></u><u></u></span></p>
</div>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">John,<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">Not entirely sure what you mean. Ixxat has had a
commercial version for 5 years, see:<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<p class="MsoNormal"><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><u></u><u></u></p>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">I evaluated it about 3 years and decided that the open
source version had some advantages.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">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.<u></u><u></u></p>
</div>
<div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">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 ?<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">Cheers<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">Gertjan<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><br clear="all">
<u></u><u></u></p>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<p class="MsoNormal">-- <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>
==================================================<u></u><u></u></p>
</div>
</div>
</div>
</div></div></div>
</div>
</blockquote></div><br><br>
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