btw: To simulate TCP benchmark testing I used sipp with TLS with NULL-cipher - this way you have the socket handling of openssl, and NULL-cipher prevents encryption (CPU usage).
regards klaus Olivier Jacques wrote: > Bruno, > > thanks for the analysis. > > Charles, > > as Bruno pointed, we are not very comfortable with the way TCP > congestion is currently implemented. Well, there are several outstanding > issues wrt TCP: > - TCP reads are octet per octet (far from being to say the least!) > - There was a message from Ajay Gupta, back in May 25th. There are 2 > fixes for TCP that looks useful I will integrate that asap. > - Are you looking to work on something else? > > Olivier. > > On 10/20/06, *Bruno, Guerin (NonHP : AtosOrigin)* <[EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]>> wrote: > > Hello > Concerning TCP congestion, here are some answers: > > 1) If a message is truncated, the rest of the message (not sent) is > sent as soon as is possible, > i.e. just after a received on the socket and before any other send. > > 2) The purpose of ctrlEWGlobal is to trace than a problem occurs > once (independantly of > the socket descriptor). > The philosophy behind this is : > -if a problem occurs, a chance is let to solve it. > -if a second problem occurs (even on a different socket), it is > because the system does > not support such traffic, so it is not useful to treat the problem > again. > > In the implementation, if a first pb occurs, the value of > ctrlEWGlobal is set to true. > If traffic is in mono socket, 'ctrlEW' is set to true. > If traffic is in multi socket a flag, attached to the socket > descriptor (poll_flag_write) is set to true. > No more sent are done till 'ctrlEW' or the flag is set to false. > If a message is received on the socket, it is supposed that the pb > is solve. 'ctrlEW' or the flag is set to false. > SIPp re-starts to send message. > If a new problem occurs (even on a different socket in multi socket > traffic), nothing is done to stop the traffic. > 'ctrlEWGlobal' prevents to enable the protection (no send) again. > SIPp continue to trying to send and receive message. > > This implementation is probably not the best one. > > 3) 'ctrlEW' is used in mono socket traffic to trace if a problem > (EAGAIN or EWOULDBLOCK) > occurs during the last send. If a problem occurs 'ctrlEW' is set > to true, no more send are done. > If a message is received, it is supposed that network problems are > solve, so 'ctrlEW' is set to true. > SIPp will try to send message again. > > > Concerning "incorrect behavior when the TCP window closed and send > returned > EWOULDBLOCK or EAGAIN" problem, no investigation has been done yet. > > > Regards > Bruno GUERIN > > -----Message d'origine----- > De : [EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]> > [mailto:[EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]>]De la part de > Charles P > Wright > Envoyé : mardi 17 octobre 2006 23:12 > À : sipp-users@lists.sourceforge.net > <mailto:sipp-users@lists.sourceforge.net> > Objet : [Sipp-users] TCP Error Handling Questions > > > > Hello, > > I have a question regarding TCP support under congestion in the > latest SIPp > releases. Previously, there was discussion on the mailing list that > pointed out incorrect behavior when the TCP window closed and send > returned > EWOULDBLOCK or EAGAIN. > > I looked at the send_message function, and have the following questions: > 1. Why are partial messages treated specially? Why not use the same > code > for messages that were not sent at all (an extreme case of being > truncated)? > 2. What is the purpose of ctrlEWGlobal? It seems that it causes the > code > to be executed only once, because I never see a false value assigned > to it. > 3. What is the purpose of ctrlEW? > > Thanks, > Charles > > > ------------------------------------------------------------------------- > Using Tomcat but need to do more? Need to support web services, > security? > Get stuff done quickly with pre-integrated technology to make your > job easier > Download IBM WebSphere Application Server v.1.0.1 based on Apache > Geronimo > http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 > <http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642> > _______________________________________________ > Sipp-users mailing list > Sipp-users@lists.sourceforge.net > <mailto:Sipp-users@lists.sourceforge.net> > https://lists.sourceforge.net/lists/listinfo/sipp-users > > ------------------------------------------------------------------------- > > Using Tomcat but need to do more? Need to support web services, > security? > Get stuff done quickly with pre-integrated technology to make your > job easier > Download IBM WebSphere Application Server v.1.0.1 based on Apache > Geronimo > http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 > <http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642> > _______________________________________________ > Sipp-users mailing list > Sipp-users@lists.sourceforge.net > <mailto:Sipp-users@lists.sourceforge.net> > https://lists.sourceforge.net/lists/listinfo/sipp-users > > > > > -- > HP OpenCall Software > http://www.hp.com/go/opencall/ > > > ------------------------------------------------------------------------ > > ------------------------------------------------------------------------- > Using Tomcat but need to do more? Need to support web services, security? > Get stuff done quickly with pre-integrated technology to make your job easier > Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo > http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 > > > ------------------------------------------------------------------------ > > _______________________________________________ > Sipp-users mailing list > Sipp-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/sipp-users -- Klaus Darilion nic.at ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Sipp-users mailing list Sipp-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sipp-users
