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</o:shapelayout></xml><![endif]--></head><body lang=DE-AT link=blue vlink=purple style='tab-interval:35.4pt'><div class=WordSection1><p class=MsoNormal><span class=SpellE><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D'>Hello</span></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D'> <span class=SpellE>Jingdong</span><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span class=SpellE><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D'>We</span></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D'> <span class=SpellE>use</span> <span class=SpellE>omniORB</span> 4.2.0 <span class=SpellE>under</span> RHEL7 x86_64 <span class=SpellE>and</span> <span class=SpellE>experience</span> <span class=SpellE>no</span> <span class=SpellE>issues</span> <span class=SpellE>like</span> <span class=SpellE>you</span> <span class=SpellE>describe</span> <span class=SpellE>them</span>.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span class=SpellE><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D'>However</span></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D'> <span class=SpellE>we</span> ran <span class=SpellE>into</span> a <span class=SpellE>performance</span> <span class=SpellE>problem</span> <span class=SpellE>with</span> a non-CORBA <span class=SpellE>network</span> <span class=SpellE>protocol</span> <span class=SpellE>where</span> <span class=SpellE>it</span> <span class=SpellE>turned</span> out <span class=SpellE>that</span> <span class=SpellE>the</span> MTU <span class=SpellE>size</span> <span class=SpellE>change</span> <span class=SpellE>from</span> RHEL6 (16436 <span class=SpellE>bytes</span>) <span class=SpellE>to</span> RHEL7 (65536 <span class=SpellE>bytes</span>) <span class=SpellE>for</span> <span class=SpellE>the</span> <span class=SpellE>loopback</span> <span class=SpellE>interface</span> was <span class=SpellE>the</span> <span class=SpellE>culprit</span>.<o:p></o:p></span></p><p class=MsoNormal><span class=SpellE><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D'>This</span></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D'> <span class=SpellE>of</span> <span class=SpellE>course</span> <span class=SpellE>only</span> <span class=SpellE>happens</span> <span class=SpellE>if</span> <span class=SpellE>the</span> <span class=SpellE>client</span> <span class=SpellE>and</span> <span class=SpellE>server</span> <span class=SpellE>run</span> on <span class=SpellE>the</span> same <span class=SpellE>machine</span>.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span class=SpellE><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D'>You</span></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D'> <span class=SpellE>can</span> <span class=SpellE>change</span> <span class=SpellE>the</span> MTU <span class=SpellE>size</span> <span class=SpellE>temporarily</span> <span class=SpellE>using</span> "<span class=SpellE>ifconfig</span> <span class=SpellE>lo</span> <span class=SpellE>mtu</span> 16384 <span class=SpellE>up</span>" <span class=SpellE>and</span> <span class=SpellE>permanently</span> <span class=SpellE>by</span> <span class=SpellE>adding</span> "MTU=16436" <span class=SpellE>to</span> /<span class=SpellE>etc</span>/<span class=SpellE>sysconfig</span>/<span class=SpellE>network-scripts</span>/<span class=SpellE>ifcfg-lo</span>.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span class=SpellE><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D'>Regards</span></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D'>, Peter.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt'><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=DE style='font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman";mso-ansi-language:DE'>Von:</span></b><span lang=DE style='font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman";mso-ansi-language:DE'> Jingdong Sun [mailto:jindong@us.ibm.com] <br><b>Gesendet:</b> Dienstag, 11. November 2014 19:10<br><b>An:</b> omniorb-list@omniorb-support.com<br><b>Betreff:</b> [omniORB] Corba slow<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Hi, there,</span> <br><br><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I experience some corba slowness when using corba with RH7?</span> <br><br><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I am using omniORB 4.1.6 with following setup (other config related to thread and connection all take default):</span> <br><span style='font-size:7.5pt;font-family:"Courier New"'>-ORBacceptBiDirectionalGIOP,1,</span> <br><span style='font-size:7.5pt;font-family:"Courier New"'>-ORBofferBiDirectionalGIOP,1,</span> <br><span style='font-size:7.5pt;font-family:"Courier New"'>-ORBthreadPerConnectionPolicy,1,</span> <br><span style='font-size:7.5pt;font-family:"Courier New"'>-ORBthreadPerConnectionLowerLimit,40,</span> <br><span style='font-size:7.5pt;font-family:"Courier New"'>-ORBthreadPerConnectionUpperLimit,50,</span> <br><span style='font-size:7.5pt;font-family:"Courier New"'>-ORBthreadPoolWatchConnection,0,</span> <br><br><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>RedHat 7.0 x86_64 version 2.4.5</span> <br><br><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>The slowness I noticed is when client trying to call to server, some times it hang there for tens of seconds to several minutes before timeout and retry (2nd retry generally work).</span> <br><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>For RH 6.x, I did not notice this, or at least not happened this often and noticeable.</span> <br><br><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Any suggestion to fix this...I feel that some config settings may help here, but I do not know what.</span> <br><br><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Thanks. </span><br><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Jingdong Sun<br>InfoSphere Streams Development<br>Phone 507 253-5958 (T/L 553-5958) <br><a href="mailto:jindong@us.ibm.com">jindong@us.ibm.com</a></span><o:p></o:p></p></div></div></body></html>