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Hi Elie,

comments in-line.

Best regards
Michael

On Feb 28, 2008, at 7:07 AM, elie wrote:

Michael,
The capture is here:

http://download.yousendit.com/BDC67D557E5A65EC

The client is 10.4.2.23 and the server is 10.4.2.65. The
client is starting to send data (164 packets using
sctp_send), than waits 10 seconds, than initiates a graceful
close (e.g. calls sctp_shutdown, than unregisterinstance).

OK. It looks like the client does a
for(i=0; i<164; i++)
sctp_send();
sleep(10)
sctp_shutdown();
The problem is that you do not give back control to the sctplib
and therefore the sctplib can not process the incoming SACKs.
The control should be in the event loop hander almost all the time.

Only 27 packets are initially sent, although sctp_send
succeeds. Only after calling sctp_shutdown you see the rest

I guess it stops sending because it is not processing the
SACKs and the reveiver window is full.

of the data capture arrives. It seems the sctp_shutdown is
sending the rest of the packets (and not unregisterinstance
as I previously written, I was wrong. I'm calling the
shutdown & unregister one after the other, but as I've
inspected it when using sctp_abort and not shutdown, the
rest of the packets are not sent, so it seems to be related
to the close).

Here's a code snippet:

Server
for (;;)
{
isdatarrived() (if so copy it and return)
sctp_extendedEventLoop(sa_mainm->mainlock,sa_mainm->mainunlock
,NULL);
}

Client

The question is: How do you call sctpsendmsg().

int sctpsendmsg(const char *buf , int len)
{
r = SCTP_send(association,
0,
(unsigned char *)buf,
len,
SCTP_GENERIC_PAYLOAD_PROTOCOL_ID,
SCTP_USE_PRIMARY,
SCTP_NO_CONTEXT,
0xFFFFFFFF, // infinite
SCTP_UNORDERED_DELIVERY,
SCTP_BUNDLING_DISABLED);

// return values
if (r==SCTP_SUCCESS)
{
return len;
}
else
{
return SOCKETERROR;
}
}




thanks,
Elie

Hi Elie,

can you provide a Wireshark trace in .pcap format and
possibly the source of your programs?

Best regards
Michael

On Feb 27, 2008, at 12:28 PM, elie wrote:

Hi,
I'm new to SCTP lib, using it on windows XP. I've written
a small server & client programs where the client sends
packets to the server.

There's a problem when the client sends sum of packets
(200~, each 100~ bytes), using sctp_send. I see the first
30~ being sent, than there's a delay on the sender side -
although the sctp_send function returns without an error,
the packets are not sent. Only when I call
unregisterInstance on the sender side the rest of the
packets are being sent.

Can someone please help me understanding this issue?
thanks-
Elie


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• [SCTP-Discussion] sctp_send delay on windows, elie, 02/27/2008
  • Re: [SCTP-Discussion] sctp_send delay on windows, Michael Tuexen, 02/27/2008
  • <Possible follow-up(s)>
  • Re: [SCTP-Discussion] sctp_send delay on windows, elie, 02/28/2008
    • Re: [SCTP-Discussion] sctp_send delay on windows, Michael Tuexen, 02/28/2008
  • Re: [SCTP-Discussion] sctp_send delay on windows, elie, 02/28/2008

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