On 05/16/2011 10:57 PM, Rob Browning wrote:
Rob Browning<rlb@xxxxxxxxxxxxxxxx> writes:
So that command ran at essentially the rates you report for 10-20
seconds. Then I killed it and tried another test I'd been using, which
was to lftp to ftp.kernel.org and get -c linux-2.6.39-rc7.tar.bz2. That
transfer started at a high rate, but settled fairly quickly at about
60KB/s. So I killed that transfer and restarted the wget, and it ran
steadily at ~60KB/s.
In case it helps, it also looks like the 60KB/s is an aggregate limit.
Once it gets into the "lower bandwidth" state, if I run multiple
transfers, the total won't go above that.
I can duplicate your result. To me, it appears to be a problem with bufferbloat.
If that is correct, then there is little I can do with rtl8192cu to fix the
problem. I see exactly the same slow rate with rt2800usb using an Ralink RT3070
device. In addition, I see that rate when connected to my router with a wired
100 Mbps connection.
What up/down rates do you see if you test with www.speedtest.net? I get 0.48
Mbps up and 12.03 Mbps down. The up rate is a little slower than the 512 Kbps
that my ISP provides. My nominal down rate is 7 Mbps with burst rates above 10
if the bandwidth is available. Apparently it was this morning.
Larry
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