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<div class=Section1>

<p class=MsoNormal><b><font size=3 color=navy face="Palatino Linotype"><span
style='font-size:12.0pt;font-family:"Palatino Linotype";color:navy;font-weight:
bold'>Hi,<o:p></o:p></span></font></b></p>

<p class=MsoNormal><b><font size=3 color=navy face="Palatino Linotype"><span
style='font-size:12.0pt;font-family:"Palatino Linotype";color:navy;font-weight:
bold'><o:p> </o:p></span></font></b></p>

<p class=MsoNormal><b><font size=3 color=navy face="Palatino Linotype"><span
style='font-size:12.0pt;font-family:"Palatino Linotype";color:navy;font-weight:
bold'>I have just uploaded to <span class=SpellE>OpenIB</span> <a
href="https://openib.org/svn/gen1/trunk/src/userspace/osm">https://openib.org/svn/gen1/trunk/src/userspace/osm</a><o:p></o:p></span></font></b></p>

<p class=MsoNormal><span class=GramE><b><font size=3 color=navy
face="Palatino Linotype"><span style='font-size:12.0pt;font-family:"Palatino Linotype";
color:navy;font-weight:bold'>a</span></font></b></span><b><font color=navy
face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:navy;font-weight:bold'> new change set (2255) with OpenSM improvements.<o:p></o:p></span></font></b></p>

<p class=MsoNormal><b><font size=3 color=navy face="Palatino Linotype"><span
style='font-size:12.0pt;font-family:"Palatino Linotype";color:navy;font-weight:
bold'>The work was done according to the plan outlined in the attached mail.<o:p></o:p></span></font></b></p>

<p class=MsoNormal><b><font size=3 color=navy face="Palatino Linotype"><span
style='font-size:12.0pt;font-family:"Palatino Linotype";color:navy;font-weight:
bold'><o:p> </o:p></span></font></b></p>

<p class=MsoNormal><b><font size=3 color=navy face="Palatino Linotype"><span
style='font-size:12.0pt;font-family:"Palatino Linotype";color:navy;font-weight:
bold'>The main changes are:<o:p></o:p></span></font></b></p>

<ol style='mso-margin-top-alt:0in' start=1 type=1>
 <li class=MsoNormal style='color:navy;mso-list:l0 level1 lfo2;tab-stops:list .5in'><b><font
     size=3 color=navy face="Palatino Linotype"><span style='font-size:12.0pt;
     font-family:"Palatino Linotype";font-weight:bold'>Semi-Static LID
     assignment - preventing LID changes due to SM restart or nodes
     rebooting. Important due to the bad affect LID changes have on IPoIB (and
     other <span class=SpellE>ULPs</span>) path record caching.<o:p></o:p></span></font></b></li>
 <li class=MsoNormal style='color:navy;mso-list:l0 level1 lfo2;tab-stops:list .5in'><b><font
     size=3 color=navy face="Palatino Linotype"><span style='font-size:12.0pt;
     font-family:"Palatino Linotype";font-weight:bold'>Irresponsive port
     scanning during light sweep - Allow the SM to recognize ports that
     were not responding in the first sweep (but had a link state that is not
     down).<o:p></o:p></span></font></b></li>
 <li class=MsoNormal style='color:navy;mso-list:l0 level1 lfo2;tab-stops:list .5in'><b><font
     size=3 color=navy face="Palatino Linotype"><span style='font-size:12.0pt;
     font-family:"Palatino Linotype";font-weight:bold'>Switch Ports that
     connect to HCA ports now have a lower HOQ value. This provides faster "drain"
     for packets waiting for bad HCA such that the entire fabric is not
     affected by a single HCA.<o:p></o:p></span></font></b></li>
</ol>

<p class=MsoNormal><b><font size=3 color=navy face="Palatino Linotype"><span
style='font-size:12.0pt;font-family:"Palatino Linotype";color:navy;font-weight:
bold'><o:p> </o:p></span></font></b></p>

<p class=MsoNormal><b><font size=3 color=navy face="Palatino Linotype"><span
style='font-size:12.0pt;font-family:"Palatino Linotype";color:navy;font-weight:
bold'>I will outline our next months work plan in my next mail for your
comments.<o:p></o:p></span></font></b></p>

<p class=MsoNormal><b><font size=3 color=navy face="Palatino Linotype"><span
style='font-size:12.0pt;font-family:"Palatino Linotype";color:navy;font-weight:
bold'><o:p> </o:p></span></font></b></p>

<div>

<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><st1:PersonName><st1:PersonName><b><i><font
  size=5 color=blue face="Monotype Corsiva"><span lang=EN-GB style='font-size:
  20.0pt;font-family:"Monotype Corsiva";mso-bidi-font-family:"Monotype Corsiva";
  color:blue;mso-ansi-language:EN-GB;font-weight:bold;font-style:italic;
  mso-no-proof:yes'>Eitan</span></font></i></b></st1:PersonName><b><i><font
 size=5 color=blue face="Monotype Corsiva"><span lang=EN-GB style='font-size:
 20.0pt;font-family:"Monotype Corsiva";mso-bidi-font-family:"Monotype Corsiva";
 color:blue;mso-ansi-language:EN-GB;font-weight:bold;font-style:italic;
 mso-no-proof:yes'> Zahavi</span></font></i></b></st1:PersonName><font size=1
color=navy face=Tahoma><span lang=EN-GB style='font-size:8.5pt;font-family:
Tahoma;color:navy;mso-ansi-language:EN-GB;mso-no-proof:yes'><o:p></o:p></span></font></p>

<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=1 color=navy face=Tahoma><span lang=EN-GB style='font-size:8.5pt;
font-family:Tahoma;color:navy;mso-ansi-language:EN-GB;mso-no-proof:yes'>Design
Technology Director<o:p></o:p></span></font></p>

<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=1 color=navy face=Tahoma><span lang=EN-GB style='font-size:8.5pt;
font-family:Tahoma;color:navy;mso-ansi-language:EN-GB;mso-no-proof:yes'>Mellanox
Technologies LTD<o:p></o:p></span></font></p>

<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=1 color=navy face=Tahoma><span lang=EN-GB style='font-size:8.5pt;
font-family:Tahoma;color:navy;mso-ansi-language:EN-GB;mso-no-proof:yes'>Tel:+972-4-9097208<br>
Fax:+972-4-9593245<o:p></o:p></span></font></p>

<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=1 color=navy face=Tahoma><span lang=EN-GB style='font-size:8.5pt;
font-family:Tahoma;color:navy;mso-ansi-language:EN-GB;mso-no-proof:yes'>P.O.
Box 586 Yokneam 20692 ISRAEL<o:p></o:p></span></font></p>

</div>

<p class=MsoNormal><b><font size=3 color=navy face="Palatino Linotype"><span
style='font-size:12.0pt;font-family:"Palatino Linotype";color:navy;font-weight:
bold'><o:p> </o:p></span></font></b></p>

<div style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'>

<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> Eitan Zahavi
[mailto:eitan@mellanox.co.il] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, April 08, 2005 7:40
PM<br>
<b><span style='font-weight:bold'>To:</span></b> 'openib-general@openib.org'<br>
<b><span style='font-weight:bold'>Subject:</span></b> [openib-general] OpenSM
work</span></font></p>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>

<p><font size=3 color=blue face="Palatino Linotype"><span style='font-size:
12.0pt;font-family:"Palatino Linotype";color:blue'>Hi All,</span></font><o:p></o:p></p>

<p><font size=3 color=blue face="Palatino Linotype"><span style='font-size:
12.0pt;font-family:"Palatino Linotype";color:blue'>FYI:</span></font> <font
color=blue face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>Mellanox is focusing on the following items on OpenSM development
for the last few weeks:</span></font><o:p></o:p></p>

<p><font size=3 color=blue face="Palatino Linotype"><span style='font-size:
12.0pt;font-family:"Palatino Linotype";color:blue'>1.     </span></font>
<font color=blue face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>Stability testing over the IB management simulator:</span></font> <br>
<font color=blue face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>a.     </span></font> <font color=blue
face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>Randomly pick bad links with high packet drop statistics</span></font>
<font color=blue face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>- success</span></font> <font color=blue
face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>is SUBNET UP</span></font> <br>
<font color=blue face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>b.     </span></font> <font color=blue
face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>Route using up/down algorithm</span></font> <font color=blue
face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>- success is no credit loops</span></font> <o:p></o:p></p>

<p><font size=3 color=blue face="Palatino Linotype"><span style='font-size:
12.0pt;font-family:"Palatino Linotype";color:blue'>2.     </span></font>
<font color=blue face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>Semi-static LID assignment:</span></font> <br>
<font color=blue face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>a.     </span></font> <font color=blue
face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>Developed an interface</span></font> <font color=blue
face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>for persistent storage of arbitrary data.</span></font> <font
color=blue face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>The goal is</span></font> <font color=blue face="Palatino Linotype"><span
style='font-family:"Palatino Linotype";color:blue'>to enable further
development of LDAP (ala Troy's request) or SQL module. Please see
osm_db.h attached</span></font><o:p></o:p></p>

<p style='margin-left:1.5in'><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black'> 
<<osm_db.h>> </span></font><o:p></o:p></p>

<p><font size=3 color=blue face="Palatino Linotype"><span style='font-size:
12.0pt;font-family:"Palatino Linotype";color:blue'>b.     </span></font>
<font color=blue face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>Developed file based implementation for osm_db.h</span></font> <br>
<font color=blue face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>c.     </span></font> <font color=blue
face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>Modify osm_lid_mgr (lid assignment algorithm) to use the LIDs
stored in the persistent storage. Handle all cases of bad file and new LIDs on
the fabric. The</span></font> <font color=blue face="Palatino Linotype"><span
style='font-family:"Palatino Linotype";color:blue'>-r flag now lets
OpenSM overwrite the known data. Persistent Guid to LIDs data</span></font> <font
color=blue face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>is kept even if the GUID</span></font> <font color=blue
face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>disappears for a while. The code also handles LID assignment for
LMC > 0 in a way better then</span></font> <font color=blue
face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>the previous</span></font> <font color=blue face="Palatino Linotype"><span
style='font-family:"Palatino Linotype";color:blue'>algorithm: It used to assign
2^LMC LIDs for every port</span></font> <font color=blue
face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>- even</span></font> <font color=blue face="Palatino Linotype"><span
style='font-family:"Palatino Linotype";color:blue'>for switches port 0. Now it
will only preserve 1 LID for switch port 0.</span></font><o:p></o:p></p>

<p><font size=3 color=blue face="Palatino Linotype"><span style='font-size:
12.0pt;font-family:"Palatino Linotype";color:blue'>3.     </span></font>
<font color=blue face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>Irresponsive port:</span></font> <br>
<font color=blue face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>a.     </span></font> <font color=blue
face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>The</span></font> <font color=blue face="Palatino Linotype"><span
style='font-family:"Palatino Linotype";color:blue'>phenomenon is: A port does
not respond to the SM during the</span></font> <font color=blue
face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>discovery stage. OpenSM can not obtain enough data about</span></font>
<font color=blue face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>the port and thus it does not</span></font> <font color=blue
face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>appear in the final</span></font> <font color=blue
face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>database. Since OpenSM uses light sweeps when there is no</span></font>
<font color=blue face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>"change detected" it will not query the port until
either a switch</span></font> <font color=blue face="Palatino Linotype"><span
style='font-family:"Palatino Linotype";color:blue'>sets its</span></font> <font
color=blue face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>"change bit" or send a trap. So that irresponsive port
will never be polled again if there is no heavy sweep.</span></font><o:p></o:p></p>

<p><font size=3 color=blue face="Palatino Linotype"><span style='font-size:
12.0pt;font-family:"Palatino Linotype";color:blue'>b.     </span></font>
<font color=blue face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>The solution:</span></font> <br>
<font color=blue face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>i.     </span></font> <font color=blue
face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>During discovery</span></font> <font color=blue
face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>track ports (physical ports) that have</span></font> <font
color=blue face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>their logical link state != DOWN but the port on the other side of
the link</span></font> <font color=blue face="Palatino Linotype"><span
style='font-family:"Palatino Linotype";color:blue'>is not known to the SM. </span></font><o:p></o:p></p>

<p><font size=3 color=blue face="Palatino Linotype"><span style='font-size:
12.0pt;font-family:"Palatino Linotype";color:blue'>ii.    </span></font>
<font color=blue face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>During light sweep:  not only scan the switches</span></font> <font
color=blue face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>"change bit" but also test to see if the port on the
other side on these ports (from i)</span></font> <font color=blue
face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>is responding. If it does</span></font> <font color=blue
face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>- issue a heavy sweep.</span></font><o:p></o:p></p>

<p><font size=3 color=blue face="Palatino Linotype"><span style='font-size:
12.0pt;font-family:"Palatino Linotype";color:blue'>4.     </span></font>
<font color=blue face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>Head of Queue Life:</span></font> <br>
<font color=blue face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>a.     </span></font> <font color=blue
face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>Problem:</span></font> <font color=blue face="Palatino Linotype"><span
style='font-family:"Palatino Linotype";color:blue'>In cases of PCI hardware
failure HCAs can not complete RDMA requests and loose all credits from their
input ports (in other words: their input buffers are filled). So they create
back pressure on the fabric. </span></font><o:p></o:p></p>

<p><font size=3 color=blue face="Palatino Linotype"><span style='font-size:
12.0pt;font-family:"Palatino Linotype";color:blue'>b.     </span></font>
<font color=blue face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>Solution: use a fast head of</span></font> <font color=blue
face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>queue time limit on every switch port that drives an HCA.</span></font>
<o:p></o:p></p>

<p><font size=3 color=blue face="Palatino Linotype"><span style='font-size:
12.0pt;font-family:"Palatino Linotype";color:blue'>5.     </span></font>
<font color=blue face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>SA queries stress testing:</span></font> <br>
<font color=blue face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>a.     </span></font> <font color=blue
face="Palatino Linotype"><span style='font-family:"Palatino Linotype";
color:blue'>We are exploring max performance of the SA and ways to improve it.</span></font>
<o:p></o:p></p>

<p><font size=3 color=blue face="Palatino Linotype"><span style='font-size:
12.0pt;font-family:"Palatino Linotype";color:blue'>Eitan</span></font><o:p></o:p></p>

<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>

<p><b><i><font size=6 color=blue face="Monotype Corsiva"><span
style='font-size:24.0pt;font-family:"Monotype Corsiva";color:blue;font-weight:
bold;font-style:italic'>Eitan Zahavi</span></font></i></b><o:p></o:p></p>

<p><font size=2 color=blue face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;color:blue'>Design Technology Director</span></font><o:p></o:p></p>

<p><font size=2 color=blue face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;color:blue'>Mellanox Technologies LTD</span></font><o:p></o:p></p>

<p><font size=2 color=blue face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;color:blue'>Tel:+972-4-9097208<br>
Fax:+972-4-9593245</span></font><o:p></o:p></p>

<p><font size=2 color=blue face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;color:blue'>P.O. Box 586 Yokneam 20692 ISRAEL</span></font><o:p></o:p></p>

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