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Date:      Wed, 9 Jul 2003 14:27:42 -0400
From:      "Dukemaster" <>
To:        "'Lapinski, Michael (Research)'" <>
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   RE: How do I max a 6Mbps link
In-Reply-To: <>

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

-----Original Message-----
[] On Behalf Of Lapinski, Michael
Sent: Wednesday, July 09, 2003 1:32 PM
To: 'Simon';;; Max
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:
   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, 
   the freebsd manual may have em soemwhere but i cant recall 


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 []
->Sent: Wednesday, July 09, 2003 1:19 PM
->To:;; 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.
->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
->>The target application is proftpd with ncftpd as the client.
->>Thanks in advance,
->> mailing list
->>To unsubscribe, send any mail to 
-> mailing list
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