RE: How do I max a 6Mbps link
From: Dukemaster (dukemaster_at_hardwareelite.com)
Date: 07/09/03
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To: "'Lapinski, Michael (Research)'" <lapinski@crd.ge.com> Date: Wed, 9 Jul 2003 14:27:42 -0400
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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- Previous message: Scot W. Hetzel: "Re: mod_frontpage & UID/GID Settings"
- In reply to: Lapinski, Michael (Research): "RE: How do I max a 6Mbps link"
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