sctp-discussion - Re: [SCTP-Discussion] Re: discussion digest, Vol 1 #903 - 1 msg

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Re: [SCTP-Discussion] Re: discussion digest, Vol 1 #903 - 1 msg

From: Michael Tuexen <Michael.Tuexen AT micmac.franken.de>
To: khalil afzal <khalil_78_pk AT yahoo.com>
Cc: discussion AT sctp.de
Subject: Re: [SCTP-Discussion] Re: discussion digest, Vol 1 #903 - 1 msg
Date: Mon Oct 30 09:02:21 2006
List-id: SCTP Discussions <discussion.sctp.de>

Hi,

if you want to compare a particular application you can run it and use DUMMYNET to provide the
delay/packet loss. If you are not interested in a particular application you could write one.
However, comparing UDP with the others is a bit difficult because UDP and no congestion
control and retransmissions. For a single home SCTP association I would expect SCTP to
be similar to TCP with SACK option except for excessive error rate, where SCTP is better.
This is due to the limitation of the length in the SACK option.

Best regards
Michael

On Oct 30, 2006, at 6:55 AM, khalil afzal wrote:

Hello Sir Sorry for late response actually there was EID HOLIDAYS In our university,Sir my task is to compare the delay and packet lose in SCTP Application and TCP,UDP application.To find which one is better to work.So in this aspect I m waiting ur response.

KHALIL
MS COMSATS

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To:
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Sent: Wednesday, October 18, 2006 6:46:56 PM
Subject: discussion digest, Vol 1 #903 - 1 msg

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Today's Topics:

1. Re: Re: discussion digest, Vol 1 #900 - 2 msgs (Michael Tuexen)

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Message: 1
Cc:
discussion AT sctp.de
From: Michael Tuexen
<Michael.Tuexen AT micmac.franken.de>
Subject: Re: [SCTP-Discussion] Re: discussion digest, Vol 1 #900 - 2 msgs
Date: Tue, 17 Oct 2006 15:18:39 +0200
To: khalil afzal
<khalil_78_pk AT yahoo.com>

Am not sure what you are asking for... Could you be a bit more precise?

Best regards
Michael

On Oct 17, 2006, at 10:30 AM, khalil afzal wrote:

Hello, I am wanted to compare the delay and packet loss in SCTP and
TCP. So please send me suggestion how to find it.

KHALIL
MS COMSATS

----- Original Message ----
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<discussion-request AT sctp.de>
To:
discussion AT sctp.de
Sent: Saturday, October 14, 2006 3:02:03 PM
Subject: discussion digest, Vol 1 #900 - 2 msgs

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Today's Topics:

1. Re: max length of a single message (Julio Kriger)
2. Re: max length of a single message (Michael Tuexen)

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Date: Fri, 13 Oct 2006 09:41:06 -0300
From: "Julio Kriger"
<juliokriger AT gmail.com>
To: "Michael Tuexen"
<Michael.Tuexen AT micmac.franken.de>
Subject: Re: [SCTP-Discussion] max length of a single message
Cc:
discussion AT sctp.de
boundary="----=_Part_74015_28915242.1160743266675"
<59BF71E0-CE96-4AC0-B139-35B4112C652F AT micmac.franken.de>

------=_Part_74015_28915242.1160743266675
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
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Hi Michael!
Correct me I get it wrong, but I understand that I can send a
message of any
length, and internaly sctplib cut the message on parts (or chuncks)
that are
deliverables to the sender. I understand that this parts or chuncks
fit on a
raw socket, are sent to the receiver and later all parts or chuncks
are put
together to obtain the original (any length) message.
I will try to look for this bug you say, and tell what I found.
Regards,
Julio

On 10/13/06, Michael Tuexen
<Michael.Tuexen AT micmac.franken.de>
wrote:

I'm not aware of a limit on the sender side, so this most likely is a
bug. However,
since the sctplib does not implement a partial delivery API, the
longest message
you can transfer is about the size of the receiver window. This
basically depends
to the receive buffer space for raw sockets and is about 20-64 KByte
on BSD systems.
Way smaller then a MB...

Best regards
Michael

On Oct 12, 2006, at 6:17 PM, Julio Kriger wrote:

Hi!
What is the maximum message length the SCTP_send function accept?
I'm trying it with 4 threads sending 1MB message each, and it
freeze.

Also I get the following error message:

AF_INET : sendto()=-1 !

what do this mean? TIA

Regards,
Julio

--
--
From the moment I picked your book up until I laid it down, I was
convulsed with laughter. Someday I intend reading it.
Groucho Marx
----------------------------
Julio Kriger
mailto:juliokriger AT gmail.com

--
--
From the moment I picked your book up until I laid it down, I was
convulsed
with laughter. Someday I intend reading it.
Groucho Marx
----------------------------
Julio Kriger
mailto:juliokriger AT gmail.com

------=_Part_74015_28915242.1160743266675
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

Hi Michael! Correct me I get it wrong, but I understand that I
can send a message of any length, and internaly sctplib cut the
message on parts (or chuncks) that are deliverables to the sender.
I understand that this parts or chuncks fit on a raw socket, are
sent to the receiver and later all parts or chuncks are put
together to obtain the original (any length) message.
 I will try to look for this bug you say, and tell what I
found. Regards, Julio <div>On 10/13/06, Michael Tuexen <<a
href="mailto:Michael.Tuexen AT micmac.franken.de">
Michael.Tuexen AT micmac.franken.de</a>>
wrote:<blockquote
class="gmail_quote" style="border-left: 1px solid rgb(204, 204,
204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">I'm not aware
of a limit on the sender side, so this most likely is a
 bug. However, since the sctplib does not implement a partial
delivery API, the longest message you can transfer is about
the size of the receiver window. This basically depends to
the receive buffer space for raw sockets and is about 20-64 KByte
 on BSD systems. Way smaller then a MB... Best
regards Michael On Oct 12, 2006, at 6:17 PM, Julio Kriger
wrote: > Hi! > What is the maximum message length
the SCTP_send function accept?
 > I'm trying it with 4 threads sending 1MB message each, and
it freeze. > > Also I get the following error
message: > > AF_INET : sendto()=-1 ! > >
what do this mean? TIA >
 > Regards, > Julio > > -- > --
 > From the moment I picked your book up until I laid it
down, I was > convulsed with laughter. Someday I intend
reading it. > Groucho Marx 
> ---------------------------- > Julio Kriger >
mailto:<a
href="mailto:juliokriger AT gmail.com">juliokriger AT gmail.com</
a> </blockquote></div> -- --
 From the moment I picked your book up until I laid it down, I
was convulsed with laughter. Someday I intend reading it.
 Groucho Marx ---------------------------- Julio
Kriger mailto:<a
href="mailto:juliokriger AT gmail.com">juliokriger AT gmail.com</a>

------=_Part_74015_28915242.1160743266675--

-- __--__--
Message: 2
Cc:
discussion AT sctp.de
From: Michael Tuexen
<Michael.Tuexen AT micmac.franken.de>
Subject: Re: [SCTP-Discussion] max length of a single message
Date: Sat, 14 Oct 2006 09:50:38 +0200
To: Julio Kriger
<juliokriger AT gmail.com>

Hi Julio,

yes this is correct. But when the message is larger than the
announced receiver window of the
receiver the association will just stop transferring data. This is
because there is no
partial delivery API.

If the receiver announces 64K, but the user on the sender side passes
a 128K message, it
will be fragmented and the first 64 K will be transferred. Then the
receiver has no more
space but also can not free space because it can not deliver the
incomplete message. So
the association is stalled.

The solution is to deliver the message in parts on the receiver side.
But this is not
implemented.

Best regards
Michael

On Oct 13, 2006, at 2:41 PM, Julio Kriger wrote:

Hi Michael!
Correct me I get it wrong, but I understand that I can send a
message of any length, and internaly sctplib cut the message on
parts (or chuncks) that are deliverables to the sender. I
understand that this parts or chuncks fit on a raw socket, are sent
to the receiver and later all parts or chuncks are put together to
obtain the original (any length) message.
I will try to look for this bug you say, and tell what I found.
Regards,
Julio

On 10/13/06, Michael Tuexen <
Michael.Tuexen AT micmac.franken.de>
wrote:I'm not aware of a limit on the sender side, so this most
likely is a
bug. However,
since the sctplib does not implement a partial delivery API, the
longest message
you can transfer is about the size of the receiver window. This
basically depends
to the receive buffer space for raw sockets and is about 20-64 KByte
on BSD systems.
Way smaller then a MB...

Best regards
Michael

On Oct 12, 2006, at 6:17 PM, Julio Kriger wrote:

Hi!
What is the maximum message length the SCTP_send function accept?
I'm trying it with 4 threads sending 1MB message each, and it

freeze.

Also I get the following error message:

AF_INET : sendto()=-1 !

what do this mean? TIA

Regards,
Julio

--
--
From the moment I picked your book up until I laid it down, I was
convulsed with laughter. Someday I intend reading it.
Groucho Marx
----------------------------
Julio Kriger
mailto:juliokriger AT gmail.com

--
--
From the moment I picked your book up until I laid it down, I was
convulsed with laughter. Someday I intend reading it.
Groucho Marx
----------------------------
Julio Kriger
mailto:juliokriger AT gmail.com

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[SCTP-Discussion] Re: discussion digest, Vol 1 #903 - 1 msg, khalil afzal, 10/30/2006
- Re: [SCTP-Discussion] Re: discussion digest, Vol 1 #903 - 1 msg, Michael Tuexen, 10/30/2006

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