North American Network Operators Group

Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical

Re: TCP and WAN issue

  • From: Robert Boyle
  • Date: Tue Mar 27 17:07:24 2007

At 04:26 PM 3/27/2007, Philip Lavine wrote:
I have an east coast and west coast data center connected with a DS3. I am running into issues with streaming data via TCP and was wondering besides hardware acceleration, is there any options at increasing throughput and maximizing the bandwidth? How can I overcome the TCP stack limitations inherent in Windows (registry tweaks seem to not functions too well)?

You will have problems obtaining anything more than 5-7Mbit/s based on 1500 byte Ethernet packets and a RTT latency of 70-90ms. You can increase your window size or use Jumbo Ethernet frames. Almost all GigE gear supports jumbo frames. I'm not sure of your application, but without OS tweaks, each stream is limited to 5-7Mbit/s. You can open multiple streams between the same two hosts or you can use multiple hosts to transfer your data. You can utilize the entire DS3, but not without OS TCP stack tweaks or a move to jumbo frames. You can also use UDP or another connectionless packet method to move the data between sites. Good luck.


Tellurian Networks - Global Hosting Solutions Since 1995 | 888-TELLURIAN | 973-300-9211
"Well done is better than well said." - Benjamin Franklin