tipc-discussion

[Tipc-discussion] [BUG]send function cannot send messages whose size are more than 66000 bytes

[Yin, H. <hu...@in...>]

Hi Jon,

I'm a intern of Intel China Software Lab. Now I'm doing TIPC's
validation job here.

Today I meet a problem. When I write a little program to send/receive
different sizes message between two programs there will be error( errno:
22, "Invalid argument") when the size of message is more than 66000
bytes.

Doesn't TIPC fragment and defragment messages?=20

Best regards,

Nick Yin

Intel China Software Lab

The content of this email message solely contains my own personal views,
and not those of my employer.

Re: [Tipc-discussion] [BUG]send function cannot send messages whose size are more than 66000 bytes

[Mark H. <ma...@os...>]

On Wed, 2004-05-19 at 04:04, Yin, Hu wrote:
> Hi Jon,
> 
> I'm a intern of Intel China Software Lab. Now I'm doing TIPC's
> validation job here.
> 
> Today I meet a problem. When I write a little program to send/receive
> different sizes message between two programs there will be error( errno:
> 22, "Invalid argument") when the size of message is more than 66000
> bytes.
> 
> Doesn't TIPC fragment and defragment messages? 

tipc.h has 

#define TIPC_MAX_MSG_SIZE 66000

Messages are fragmented, but at a smaller size (the max_packet size in
the bearer structure) up to a maximum message size.  I believe that
66000 is the largest size of a  single message handled by tipc.

Mark.

-- 
Mark Haverkamp <ma...@os...>

Re: [Tipc-discussion] [BUG]send function cannot send messages whose size are more than 66000 bytes

[Jon M. <jon...@er...>]

Hi Hu,
It does fragment/defragment messages, but only up to a limit, depending
on the socket type you are using. If you use message oriented sockets,
i.e., SOCK_SEQPACKET,SOCK_RDM or SOCK_DGRAM, it will
only fragment up to MAX_MSG_SIZE, which is indeed 66000 bytes.

If you use SOCK_STREAM, it will fragment up to a size of 100 Mbyte
per sent "chunk". I must admit that I have still not tested this feature
beyond 66k (this is on my TODO list), so you may quite well run into
bugs here.  Any feedback on this is welcome.

Regards /Jon

Yin, Hu wrote:

>Hi Jon,
>
>I'm a intern of Intel China Software Lab. Now I'm doing TIPC's
>validation job here.
>
>Today I meet a problem. When I write a little program to send/receive
>different sizes message between two programs there will be error( errno:
>22, "Invalid argument") when the size of message is more than 66000
>bytes.
>
>Doesn't TIPC fragment and defragment messages? 
>
>Best regards,
>
>Nick Yin
>
>Intel China Software Lab
>
>The content of this email message solely contains my own personal views,
>and not those of my employer.
>
>
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