Re: Checklist (sub-thread of: "Slow file sharing performance: lost pidgeons")

On Mon, 8 Sep 2003, James Knott wrote:

> I used dial up, the problems return.  This only appears to apply to 
> protocols that use UDP.  FTP, which uses TCP, doesn't experience that 
> problem.  My conclusion is that the problem is with Samba & NFS and not 
> CIPE.  I would expect this is due to the lack of UDP flow control, 
> except as may be provided by a particular service.  My experience, where 
> file sharing from the notebook backs this up, as data from the notebook 
> would be initially limited by the dialup connection and there would be 
> no concern about over-running some slower device further on.

that's why I suggested not to use UDP protocol for VPN. UDP is slow with 
slow network connections and is extremely dependent of packet loss and 
ping time. I always get lower speeds with UDP rather than TCP/IP, on the 
same connection. FTP transfer is always ca 30-40% faster than UDP transfer 
(NFS or Cipe VPN), even on fibre cable connections. And I think there's 
nothing to do to make things better.

tanel


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