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.lab...@autoliv.com. Tel: (978) 674-6526 Fax: (978) 674-6581 ****************************** Neither the footer nor anything else in this E-mail is intended to or constitutes an <br>electronic signature and/or legally binding agreement in the absence of an <br>express statement or Autoliv policy and/or procedure to the contrary.<br>This E-mail and any attachments hereto are Autoliv property and may contain legally <br>privileged, confidential and/or proprietary information.<br>The recipient of this E-mail is prohibited from distributing, copying, forwarding or in any way <br>disseminating any material contained within this E-mail without prior written <br>permission from the author. If you receive this E-mail in error, please <br>immediately notify the author and delete this E-mail. Autoliv disclaims all <br>responsibility and liability for the consequences of any person who fails to <br>abide by the terms herein. <br> ****************************** _______________________________________________ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
