Bidirectional speed question

[Greger Cronquist]

Paul Slootman wrote:

>On Mon 17 May 2004, Greger Cronquist wrote:
>  
>
>>I'm wondering if the following is rsync-related or an issue with my 
>>supposedly synchronous internet connection:
>>
>>I have a server running an rsync daemon. When I simultaneously pull and 
>>push files to this server using two separate processes on the client 
>>(different directories), I get about half the transfer speed compared to 
>>just running one process. This also occurs when the files are new (so 
>>the rsync algorithm should not be active which otherwise causes data to 
>>be sent in both directions).
>>
>>Is this to be expected from rsync? Or is it (a) a bug or (b) connection 
>>related?
>>    
>>
>
>Depending on the speeds of connection, transfer, cpu power, etc., it
>could simply be that running 2 instances of rsync is severly impacting
>the effective cpu time that is usefully available.
>
>In short, without much more data it's impossible to say what might be
>the matter.
>
>
>Paul Slootman
>  
>
Thanks for your reply!

1. All files are new => virtually no cpu usage at either end.
2. Line speed is around 100 kbps but halves when transferring files in 
both directions.
3. Win2k server at both ends.
4. rsync 2.6.1cvs (just before 2.6.2) at both ends. Exactly the same 
binaries.

/Greger