How do I max a 6Mbps link

[Lapinski, Michael (Research)]

I said roughly.

--------------------------------------------------
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: Dukemaster [mailto:dukemaster at hardwareelite.com]
->Sent: Wednesday, July 09, 2003 2:28 PM
->To: 'Lapinski, Michael (Research)'
->Cc: freebsd-isp at freebsd.org; freebsd-questions at freebsd.org
->Subject: RE: How do I max a 6Mbps link
->
->
->Wrong again a 6megabit link is exactly 768kilobytes/sec
->
->
->-----Original Message-----
->From: owner-freebsd-isp at freebsd.org
->[mailto:owner-freebsd-isp at freebsd.org] On Behalf Of Lapinski, Michael
->(Research)
->Sent: Wednesday, July 09, 2003 1:32 PM
->To: 'Simon'; freebsd-isp at freebsd.org; 
->freebsd-questions at 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 at optinet.com]
->->Sent: Wednesday, July 09, 2003 1:19 PM
->->To: freebsd-isp at freebsd.org; freebsd-questions at 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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