site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com Importance: Normal User-agent: SquirrelMail/1.4.9a-3.berkeley Hi Chuck, Thanks for the advice. However, there is no option to modify the ring buffer size in the info.plist file. Also, the AppleYukon2 driver is not open source (or at least not available for download from the Darwin source code page). I asked about this on one of the apple dev lists quite some time ago and was told it had to do with NDA issues with Marvell. For another project I actually ported the linux sky2 driver to OS X so that I could hack it for my nefarious purposes (a coreaudio driver to support an ethernet based audio device which required stuff to happen at primary interrupt time). I believe the relevant kernel variable is actually kern.ipc.maxsockbuf which is set by default to 8388608 in Leopard. In my code I set the size of the receive socket buffer to 2097152. Making it bigger doesn't help (since the packets aren't being discarded by the network stack but by the ethernet device). As suggested by a previous contributor to this thread, I will file a bug report and post the problem report # to this list. thanks -rimas

Try editing the info.plist file for the Yukon driver under OSX and increase the ring buffer sizes. After making the change you will have to execute:

sudo touch /System/Library/Extensions

and reboot. This will force the system to recache all drivers on boot.

Alternately, if the driver doesn't allow modification of the ring buffer sizes from the info.plist text file, you could download the source (available as part of darwin) and create larger buffers inside the driver. Recompiling it and installing it is left as an exercise for the reader (ask back here if you get stuck).

Lastly, make sure the net.inet.udp.* values are set to appropriate values. Run 'sysctl -A' to see what they are under both OSX and Linux. Feel free to try the values from Linux as your OSX values.

There's room to tune here. Don't give up so easily. Please recall that OSX is, out-of-the-box, tuned for a regular user.

cr

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