Parallel sockets or?

[bruce.labitt at autoliv.com]

The TCP connection to my FFT server is not performing anywhere near the 
link speed.  (14%)  I've scoured the net (and this list, probably to your 
annoyance) looking for ways to optimize the link speed.  Having tried most 
of them, (including jumbo frames, interrupt coalescence, tuning socket 
sizes to BDP, wmem_max, etc.) and only realizing at most a 10% increase of 
speed over default setting has me frustrated.  However, it has given me a 
great deal of respect for the great work that others have put into the OS 
and TCP.

Reading some papers about increasing WAN performance between super 
computers mentioned the use of parallel sockets to increase TCP network 
throughput.  The parallel sockets with default TCP settings had higher 
throughput than a single "highly tuned" socket.  There are quite a few 
papers explaining how this can be.

Apparently this parallel socket technology is using in several products, 
like filezilla, and there is a plugin for Firefox to increase download 
speed.

Supposedly there is a psocket library.  psockets are supposed to "look" 
like BSD sockets.  So the programming did not look too bad.  I went to 
sourceforge and found a project that had been set up and apparently 
abandoned.  Nothing to download, at least not directly.

The originators of psock were at cesnet.cz, there is a link to the library 
at http://www.cesnet.cz/project/qosip

The make doesn't finish.  Several compile errors.  I played about a bit, 
but did not make much headway...

I've sent an email to Dr. Sven Ubik at cesnet.cz but have not heard from 
him...  Anyone find a good download site for psockets?

I did find UDT, which looks interesting.  For the main transport it uses 
UDP, with overhead to make it "reliable".  Supposedly it is very fast.  I 
did try the test code, at least the project compiled, and I managed to 
send data at 650Mbps, across my local network, if I believe its 
diagnostics.  Unfortunately for me, it is written all in C++, which makes 
it hard for me to understand how to use it.  If at all possible, I'd like 
to use simpler, C libraries and TCP.

Suggestions, comments, where do I go from here???

Regards,
Bruce

Bruce Labitt
Autoliv Electronics
1011B Pawtucket Blvd, PO Box 1858
Lowell, MA  01853

Email: bruce.labitt at autoliv.com. 
Tel:  (978) 674-6526
Fax: (978) 674-6581 

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