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Date:      Wed, 9 Jul 2003 14:27:42 -0400
From:      "Dukemaster" <dukemaster@hardwareelite.com>
To:        "'Lapinski, Michael (Research)'" <lapinski@crd.ge.com>
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   RE: How do I max a 6Mbps link
Message-ID:  <!~!UENERkVCMDkAAQACAAAAAAAAAAAAAAAAABgAAAAAAAAA4RatOouMvEOzXXL4aXw9/cKAAAAQAAAA6hJPemTZhkSCcbJGVpp3LwEAAAAA@hardwareelite.com>
In-Reply-To: <E4AAC34FE3CF564D8AE89EB8AC333FD70916516D@xmb03crdge.crd.ge.com>

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Wrong again a 6megabit link is exactly 768kilobytes/sec


-----Original Message-----
From: owner-freebsd-isp@freebsd.org
[mailto:owner-freebsd-isp@freebsd.org] On Behalf Of Lapinski, Michael
(Research)
Sent: Wednesday, July 09, 2003 1:32 PM
To: 'Simon'; freebsd-isp@freebsd.org; freebsd-questions@freebsd.org; Max
Clark
Subject: RE: How do I max a 6Mbps link


1) "6mbps link, which is roughly 3megs/sec" is inaccurate 
   6 Mbits is roughly 600kilobytes/second

2) A common way to speed up transfers is to tune your 
   tcp window sizes using /sbin/sysctl.
   The two you may wish to lok at are:
	net.inet.tcp.sendspace
	net.inet.tcp.recvspace
   try values like 128000 and 256000
   Doing so so on bnoth machien sshould increase your throughput.

   A good reference for all the syctl variable is available at
   http://people.freebsd.org/~adrian/sysctl.descriptions, 
   the freebsd manual may have em soemwhere but i cant recall 
   where.

-mtl

--------------------------------------------------
Michael Lapinski
Computer Scientist
GE Research


"I think there is a world market for maybe five computers."
            - IBM Chairman Thomas Watson, 1943


->-----Original Message-----
->From: Simon [mailto:simon@optinet.com]
->Sent: Wednesday, July 09, 2003 1:19 PM
->To: freebsd-isp@freebsd.org; freebsd-questions@freebsd.org; Max Clark
->Subject: Re: How do I max a 6Mbps link
->
->
->
->Sounds like you have a problem with your server/network hardware or
->firewall/proftpd settings. FreeBSD out of the box on low-end 
->Intel hardware
->can  easily sustain 6mbps link, which is roughly 3megs/sec. Make sure
->your harddrive on receiving end can write at least this fast 
->and your network
->is capable of such transfers. Sometimes faulty switches/cable 
->wires can
->cause packet loss/delays, causing a bottleneck. It could be a 
->number of
->things, but I would start with testing your network.
->
->-Simon
->
->On Wed, 9 Jul 2003 10:12:03 -0700, Max Clark wrote:
->
->>Hi all,
->>
->>What configuration changes do I need to make to two 
->freebsd-stable boxes to
->>fully max out a 6Mbps/220ms network link? This is for bulk 
->500+MB file
->>transfers.
->>
->>The target application is proftpd with ncftpd as the client.
->>
->>Thanks in advance,
->>Max
->>
->>_______________________________________________
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->
->
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->
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