[188930] in North American Network Operators' Group
Re: Latency, TCP ACKs and upload needs
daemon@ATHENA.MIT.EDU (Chris Welti)
Mon Apr 25 00:23:09 2016
X-Original-To: nanog@nanog.org
To: nanog@nanog.org
From: Chris Welti <chris.welti@switch.ch>
Date: Fri, 22 Apr 2016 10:26:18 +0200
In-Reply-To: <20160420142753.GA58668@ussenterprise.ufp.org>
Errors-To: nanog-bounces@nanog.org
On 20/04/16 16:27, Leo Bicknell wrote:
> 90%+ of the stacks deployed will be too small. Modern Unix generally
> has "autotuning" TCP stacks, but I don't think Windows or OS X has
> those features yet (but I'd be very happy to be wrong on that point).
> Regardless of satellite uplink/downlink speeds, boxes generally need
> to be tuned to get maximum performance on satellite.
Windows also has TCP buffers auto-tuning since Windows 7/Vista up to 16MB, however only receiver-side tuning on their client versions,
for sender-side tuning you will need a server version.
That means uploading stuff from a regular windows "client" machine to a remote host with a large RTT will be very slow.
--
Chris
