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Date:      Tue, 17 Oct 2000 15:38:48 +0300
From:      Ruslan Ermilov <ru@sunbay.com>
To:        fooler <fooler@skyinet.net>
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: tcp window size 17520
Message-ID:  <20001017153848.A24731@sunbay.com>
In-Reply-To: <39EC17DC.C5180B0C@skyinet.net>; from fooler@skyinet.net on Tue, Oct 17, 2000 at 05:11:56PM %2B0800
References:  <39EC17DC.C5180B0C@skyinet.net>

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On Tue, Oct 17, 2000 at 05:11:56PM +0800, fooler wrote:
> hi all,
> 
> why is it www.freebsd.org web site is using tcp window size of 17520
> instead of 16384?
> 
The receive buffer for TCP is initially set to net.inet.tcp.recvspace,
but later is rounded up to the MSS for efficiency:

buffer = roundup(buffer, mss);

roundup(16384, 1460) = 17520

* mss=1460 on Ethernets with MTU=1500.

> and why is it they dont enable rfc1323?
> 
By default.  The rc.conf(5) manpage explains why it is so.


-- 
Ruslan Ermilov		Oracle Developer/DBA,
ru@sunbay.com		Sunbay Software AG,
ru@FreeBSD.org		FreeBSD committer,
+380.652.512.251	Simferopol, Ukraine

http://www.FreeBSD.org	The Power To Serve
http://www.oracle.com	Enabling The Information Age


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