This weekend I had my wireless ISP service (Digis) upgraded to their newer canopy equipment, offering a *4Mbps service. Unfortunately I cannot seem to get any benefit from it.
The installer hooked his XP laptop directly to the bridge and saw 4Mbps on repeated speed tests (both speedtest.digis.net and speakeasy.net speedtests). However, directly from either my firewall (redhat, 2.4.18 kernel, eepro100 driver) or my desktop (gentoo, 2.6.17 kernel, tulip driver), I can barely get above 1Mbp with the same tests. I've gone over the tcp tuning guides, used iperf, and cannot figure out what I'm missing. as per the tuning guides, in /proc/sys/net I've played with: core/rmem_max -> 16777216 core/wmem_max -> 16777216 ipv4/tcp_rmem -> 4096 87380 16777216 ipv4/tcp_wmem -> 4096 87380 16777216 ipv4/tcp_rfc1337 -> 1 ipv4/tcp_sack -> 0 I've never had to really do anything to get TCP to 'just work' before. I get 91Mbps+ on my local 100BT just fine (8% overhead as expected). Any ideas? *BTW, for anyone looking at Digis, their recent ads are wildly false. They advertise "speeds up to 7Mbps, but when you actually get the documents to sign it says "7Mbps (combined)", meaning 4.5down + 2.5 up, or whatever it actually is. Worse, when I initially talked to their sales and asked about real-world performance he said, "well, when it's busy it can drop down to around 6.5, but is nearly always above 6", further implying that the 7 was in one direction. Regardless, $40/month is still a good price for 4Mbps service IMO. /* PLUG: http://plug.org, #utah on irc.freenode.net Unsubscribe: http://plug.org/mailman/options/plug Don't fear the penguin. */
