Re: What exactly is net.inet.tcp.sockthreshold?
Re: What exactly is net.inet.tcp.sockthreshold?
- Subject: Re: What exactly is net.inet.tcp.sockthreshold?
- From: "Peter Sichel" <email@hidden>
- Date: Sun, 2 Oct 2005 16:26:55 -0400
On 9/30/05, Chris McFarling wrote:
>Is there a way to force AFP to use a specific window size? Long story
>short...when two Gb OS X clients send simultaneously to our XServe (via
>AFP), the transfer rate for each drops to about 6MB/s. (when either machine
>is sending by itself, the transfer rate is ~ 30-40MB/s). I've duplicated
>this behavior with iperf as well. Using iperf, I've found that by decreasing
>the window size, the performance is dramatically improved.
>
>I would love to be able to make AFP use a smaller window size as well, at
>least to test and see if it makes a difference.
Simultaneous upload and download performance is a classic
problem with TCP/IP.
<http://homepage.ntlworld.com/robin.d.h.walker/cmtips/downup.html>
You might want to consider using a rate limiter like IPNetSentryX:
<http://sustworks.com/site/app_note_1006.html>
It adjusts the TCP window size on the fly to improve traffic flow
(especially when large buffers are involved).
You might also use IPNetTunerX to experiment with various settings
on the fly, and IPNetMonitorX see the corresponding effect.
Kind Regards,
- Peter Sichel
Sustainable Softworks
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