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[SCTP-Discussion] Re: discussion digest, Vol 1 #900 - 2 msgs


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  • From: khalil afzal <khalil_78_pk AT yahoo.com>
  • To: discussion AT sctp.de
  • Subject: [SCTP-Discussion] Re: discussion digest, Vol 1 #900 - 2 msgs
  • Date: Tue Oct 17 10:42:02 2006
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  • List-id: SCTP Discussions <discussion.sctp.de>
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



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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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Message: 1
s=beta; d=gmail.com;
b=JtTk94r4uaC6E4GlO+b8R2qFNHvA/avUcK9MOgNO4RCUF+vAoYlXmimvn9TmHo0WInMisb7VF6TU9qClmXgxz1Ek3QhcNshmkQHWa0vwGBzoZc/x7ZxSH+QZ8Eyz5Xqhe4bsdEf0NND+lscF1twNXVzu9yu9aR6ZhwZQzN1Ad+A=
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>

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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

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Content-Transfer-Encoding: 7bit
Content-Disposition: inline

Hi Michael!<br>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.
<br>I will try to look for this bug you say, and tell what I
found.<br>Regards,<br>Julio<br><br><br><br><div><span class="gmail_quote">On
10/13/06, <b class="gmail_sendername">Michael Tuexen</b> &lt;<a
href="mailto:Michael.Tuexen AT micmac.franken.de">
Michael.Tuexen AT micmac.franken.de</a>&gt;
wrote:</span><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
<br>bug. However,<br>since the sctplib does not implement a partial delivery
API, the<br>longest message<br>you can transfer is about the size of the
receiver window. This<br>basically depends<br>to the receive buffer space for
raw sockets and is about 20-64 KByte
<br>on BSD systems.<br>Way smaller then a MB...<br><br>Best
regards<br>Michael<br><br>On Oct 12, 2006, at 6:17 PM, Julio Kriger
wrote:<br><br>&gt; Hi!<br>&gt; What is the maximum message length the
SCTP_send function accept?
<br>&gt; I'm trying it with 4 threads sending 1MB message each, and it
freeze.<br>&gt;<br>&gt; Also I get the following error
message:<br>&gt;<br>&gt; AF_INET : sendto()=-1 !<br>&gt;<br>&gt; what do this
mean? TIA<br>&gt;
<br>&gt; Regards,<br>&gt; Julio<br>&gt;<br>&gt; --<br>&gt; --<br>&gt; From
the moment I picked your book up until I laid it down, I was<br>&gt;
convulsed with laughter. Someday I intend reading it.<br>&gt; Groucho Marx<br>
&gt; ----------------------------<br>&gt; Julio Kriger<br>&gt; mailto:<a
href="mailto:juliokriger AT gmail.com">juliokriger AT gmail.com</a><br><br></blockquote></div><br><br
clear="all"><br>-- <br>--<br>From the moment I picked your book up until I
laid it down, I was convulsed with laughter. Someday I intend reading it.
<br>Groucho Marx<br>----------------------------<br>Julio Kriger<br>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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