>> X download speeds are about 25% of Classic. The entire >> network is identical. Only change is the OS. X loads the Modem Test >> Page at 14.4 or less. Classic loads at 48k or better. Odd. > >That *is* odd. I went from 48K in OS9 to 44K in OSX. I'm >using an outboard Supra modem & doing routing in OSX >(*extremely* simple NAT firewall). I'm guessing it has >something to do with your Ethernet link to the router, >although I'm not seeing any kind of bottleneck on my >system there either.
I am not a TCP expert, but I seem to remember that there is a specific size for TCP packets. Sometimes, NAT or other routing devices put more info in the header of the packet (the size of the _data_ remains the same), pushing the _total_ size of the packet over this limit, causing a retry. Retrys slow down data transfer. The solution is to tell the TCP stack to make the size of the packet smaller (data size smaller) so that when the header on the packet gets changed by the router, the total size of the packet remains under the limit. I think it is the MTU size? My conjecture is that Classic is forcing the total size of the TCP packets to be smaller to pass thru OS X, which is "fixing" this problem. I don't know if this is completely correct, or how to change this valiue in OS X. If I am correct, reducing the TCP packet size would increase the speed of OS X transfers, and decrease the speed of Classic transfers because more packets would be required to transmit the same amount of data. I did a quick Google for "MTU size" and found this link- <http://www.speedguide.net/editorials/packet_size.shtml> Sorry, I've got a dealine and can't do more research. -- Charles Dostale [EMAIL PROTECTED] System Administrator, Silver Oaks Communications http://www.silveroaks.com 824 17th Street, Moline IL USA 61265 309-797-9898 -- MaX-list is sponsored by <http://lowendmac.com/> and... / Buy books, CDs, videos, and more from Amazon.com \ / <http://www.amazon.com/exec/obidos/redirect-home/lowendmac> \ Support Low End Mac <http://lowendmac.com/lists/support.html> MaX-list info: <http://lowendmac.com/linux/max.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/max-list%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
