Date: Thu, 14 Apr 2011 05:35:24 -0400 From: Peter Lai <cowbert@gmail.com> To: freebsd-wireless@freebsd.org Subject: uplink bandwidth < 1/3 downlink bandwidth? Message-ID: <BANLkTikYUL4VP5SgAimi-kMc8sUU9yrL6Q@mail.gmail.com>
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This is probably more of a layer1/2/management issue, but someone in IRC told me to ask the mailinglist about it so here it goes: On a client running <Atheros 5212> AR2413 hardware, the uplink bandwith appears to be very bad compared to the downlink. The downlink I can get almost theoretical-real speed, 19Mbps/1.9Mib/s from an Aruba centralized wifi net with WPA2, but uplink to the same AP runs at barely 3Mbps/300Kib/s. I have a passive 9dbi duck antenna connected to my pci card and I get s/n of 82/96 according to ifconfig wlan0 list scan and I have set the transmitter to txpower 30 and ifconfig reports OFDM capable at 54Mbps. Again, I can pull downlink pretty fast, and even when I'm pulling this traffic I am pretty lag free (simultaneous ping from the client to the aggregation router only increases by 50ms at most), but when I upload my ping goes through the roof (up to 3000ms) and it looks like my uplink bandwidth is overutilized. The speeds are measured by dd at the client. Any 802.11 gurus know what might be up with this? I'm pretty sure it's not FreeBSD specific but maybe I can still be pointed in a direction (maybe it's a traffic shaping policy on the AP or something).
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