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Re: OS X TCP/IP crippled by default?


On 12/12/2005, at 8:05 AM, Dan Shoop wrote:

At 9:01 PM -0500 12/10/05, Jason Dixon wrote: 
On Dec 10, 2005, at 8:37 PM, Dan Tappin wrote:

On Dec 10, 2005, at 6:11 PM, Anthony Palermo wrote:

Could you explain how u performed the test

It's a crude but simple test. I took a ~1.5 MB log file and I am transferring it via wget across the VPN. I access the same file from my Xserve and my RH Linux server. Now my users accessing the servers via SMB but the performance seems to be the same across the board.

The one thing I have not tried is a transfer the other way (i.e. access the file on the VPN server from the Xserve and the test RH server).

I used wget because it reports a final transfer rate.

Please re-run your tests *locally* (no VPN connection) using smbclient on as many different OS combinations as possible.
Smbclient also reports the transfer rate.

Yes, test over the Internet aren't valid. You need a stable, quiescent network on which to run tests if they're to have any meaning.

At 7:35 AM -0600 12/11/05, Brendan O'Toole wrote:
Just get yourself a copy of Ethereal or Etherpeek. Open a terminal window on the OS X box and run tcpdump (something like "tcpdump -i eth0 -v -w filename", look at the man page for full details). Run a small transfer. Then break the tcpdump and open the output file in your analysis program and sort it by conversation.

Well if you're already going to be running Ethereal, why not just let *it* capture the packets, as it's much easier than fiddling w tcpdump and permits easier filter building.
--

-dhan

It's possible the performance issues may be related to the increased latency introduced via the wireless ISP and VPN, this link has some interesting points:

http://www2.ics.hawaii.edu/~esb/2000fall.ics651/sep28.html

Also if you google for NO_DELAY you will find quite a bit of research and reporting on TCP performance over high BW high latency links. I don't think there is a simple solution.

Cheer, Shane
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References: 
 >Re: OS X TCP/IP crippled by default? (From: "Anthony Palermo" <email@hidden>)
 >Re: OS X TCP/IP crippled by default? (From: Dan Tappin <email@hidden>)
 >Re: OS X TCP/IP crippled by default? (From: Jason Dixon <email@hidden>)
 >Re: OS X TCP/IP crippled by default? (From: Dan Shoop <email@hidden>)



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