[Twisted-Python] TCP Packet Size Considerations

Jp Calderone exarkun at divmod.com
Tue Mar 8 23:16:06 EST 2005

On Wed, 9 Mar 2005 15:06:50 +1100, Grant McDonald <gmcdonald at infocomp.com> wrote:
>Hi All,
> I am translating a twisted UDP implementation to a TCP implementation and i
> have come across some unexpected errors related to the amount of data
> written to a TCP transport. When a large amount of data is written to a TCP
> connection (approx. 9KB) the connection is dropped and transmission is
> unsuccessful. Between about 4KB-9KB (approx.) the connection is not dropped
> but the transmission is incomplete as the unpickling raises a ValueError
> (insecure pickle string). Under 4KB transmission is faultless. Is this a
> known limitation? I was aware of the 8KB of UDP packets but assumed that
> there were no such limitations on TCP connections. Can someone please
> enlighten me?

  There are no such known limits.  I might even go as far to say that there are no such limits, if I were feeling daring. :)  Do you have a short program which demonstrates this behavior that you can share?  Perhaps after looking at that someone can suggest the cause of the disconnects.


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