On Mon, 16 Feb 2004, Ryan Wheaton wrote: > Hey guys, > > I've finally gotten my PoPToP VPN server to accept connections > correctly, and all seems to be dandy, but it is unbelievably slow. I > couldn't get exact Mb/s times, but when I tried to copy the CentOS ISOs > (about 1.8Gb) to a file share over the VPN, it was going to take about > 23 hours. I have a cable modem at home, so i'd expect that performance > would be considerably worse for dial-up users. I expected it to be > slower than physically being in the office, but not THAT much slower. > Is this kind of performance expected? Is there any way to tune the > server to improve performance?
Did you run a similar test without the VPN to compare? Don't compare apples (local LAN speeds) to oranges (cable modems). Remember that your cable modem upload speed is probably about 384 Kbit/sec (at least that's the standard in this area for TWC). 1.8 GB is about 1932735283 bytes or 15461882266 bits. Dividing by (384*1000), this makes a theoretical minimum transfer time of 39321 seconds, or 10.9 hours. Now, that estimate doesn't take into account : normal overhead of TCP/IP, any other network traffic, etc. Add the overhead of the VPN and a 23-hour estimate is indeed a lot slower, but not off by THAT much, especially since you may not have run the download long enough to get a good estimate. And my calculation is based on a 384 Kbit/sec upload rate, which could be slower on your cable modem, changing the calculations quite a bit. --Jeremy -- /---------------------------------------------------------------------\ | Jeremy Portzer [EMAIL PROTECTED] trilug.org/~jeremy | | GPG Fingerprint: 712D 77C7 AB2D 2130 989F E135 6F9F F7BC CC1A 7B92 | \---------------------------------------------------------------------/ -- TriLUG mailing list : http://www.trilug.org/mailman/listinfo/trilug TriLUG Organizational FAQ : http://trilug.org/faq/ TriLUG Member Services FAQ : http://members.trilug.org/services_faq/ TriLUG PGP Keyring : http://trilug.org/~chrish/trilug.asc
