SIPp will read a message until it finds a "\r\n\r\n", at which point it
knows that it received the headers. Next it finds the Content-Length
header in the message, and if it exists reads the number of bytes
specified in the content length header. A message is not complete until
the full number of bytes have been read from the socket. A message can
not be a partial message, unless an error occurred on the socket.
What I did is insert a bit of buffering, so that SIPp will suck up the
available bytes in the TCP buffer into a local buffer in one system call.
The next time SIPp needs to read one or more bytes, it looks in the local
buffer first; avoiding the system call. This does not change any of the
logic for determining if something is partial or complete.
Charles
Katty Xiong <[EMAIL PROTECTED]> wrote on 01/09/2007 03:49:55 PM:
>
> Hi Charles,
>
> I see you have made a lot of changes to TCP handling
> in SIPp. Could you explain how SIPp decides if a SIP
> message is complete or partial? Since I suspect the
> problem I am seeing could be caused by SIP message
> compatibility issue between SER and SIPp.
>
> thanks,
> Joy
>
> --- Charles P Wright <[EMAIL PROTECTED]> wrote:
>
> > What release of SIPp are you using? The latest
> > (1.1-rc8) has lots of TCP
> > fixes, which should hopefully solve your problems.
> >
> > Charles
> >
> > [EMAIL PROTECTED] wrote on
> > 01/09/2007 01:26:53 PM:
> >
> > > Hi,
> > >
> > > I am using SIPp and SER for some performance study
> > and
> > > get several errors when using TCP protocol. From
> > the
> > > packet trace, I notice when TCP publicize zero
> > window
> > > at SIPp or SER side, SIP message will get
> > truncated or
> > > several partial or whole SIP message get combined
> > in
> > > one TCP packet, which leads to error. I haven?t
> > > checked the code yet, but if somebody already
> > knows
> > > this off the head, please clarify me of the
> > following
> > > questions.
> > > 1) When SIPp receives a truncated SIP message,
> > how
> > > does it handle the partial message?
> > > 2) When SIPp receives a packet that has one
> > partial
> > > SIP message combined with another partial SIP
> > message,
> > > how does it handle the packet?
> > >
> > > I joined the alias recently, so if the alias
> > already
> > > had discussions on TCP stream behavior and its
> > effects
> > > on SIP implementation, could somebody point the
> > link
> > > to me?
> > >
> > > Thanks,
> > > Joy
> > >
> > >
> > > __________________________________________________
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> >
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