[95462] in North American Network Operators' Group
Re: TCP and WAN issue
daemon@ATHENA.MIT.EDU (Robert Boyle)
Tue Mar 27 17:05:59 2007
Date: Tue, 27 Mar 2007 17:04:20 -0400
To: Philip Lavine <source_route@yahoo.com>, nanog <nanog@merit.edu>
From: Robert Boyle <robert@tellurian.com>
In-Reply-To: <379373.72674.qm@web30813.mail.mud.yahoo.com>
Errors-To: owner-nanog@merit.edu
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.
-Robert
Tellurian Networks - Global Hosting Solutions Since 1995
http://www.tellurian.com | 888-TELLURIAN | 973-300-9211
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