[interfacekit] Re: Portlink implementation

On Tue, 15 Jul 2003 10:01:43 +0200 "Marc Flerackers" <
mflerackers@xxxxxxxxxx> wrote:
[...]
> This is what we want to prevent, _BSession_ is extremely fast because 
> it
> doesn't need allocations/deallocations and only does one copy to put 
> the
> data into the buffer. We need to be able to send what we have in the 
> buffer,
> not copy it again. Besides there's a limit to port capacity, you 
> can't just
> send a message of any size.

I played a bit with it and it seems the R5 limit is at about 2MB. A 
little less and it not always the same, which makes me suspect, that 
some kind of global buffer or limit is used for all ports. Our 
implementation has a 65KB limit per message, which is certainly not 
adequate.

BTW, R5's write_port() doesn't even report an error, when the message 
is too large. It simply doesn't write the message and nevertheless 
returns B_OK.

CU, Ingo

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