--- On Tue, 4/5/11, Felix Fietkau <n...@openwrt.org> wrote: On 2011-04-05 6:54 PM, Serene Gud wrote: > > > On 2011-04-05 6:03 PM, Serene Gud wrote: > > > > > On 2011-04-05 5:44 PM, Bernhard Walle wrote: > > > Hello, > > > > > > we're using a PCIe AR9280 card on a Octeon MIPS CPU. The system > > > that does the transmission has a high CPU utilization: > > > > > > iperf in UDP mode with 50M bandwith has ~90 % CPU utilization > with a > > > high softirq proportion. > > > > > > Using an Intel card (5300) has a lower CPU utilization (~60 %), > > but it's > > > no option to use it because the Linux driver has no access point > > mode. > > > > > > Are there any tweaks to decrease the CPU utilization with the ath9k > > > driver? Any recommendations for the application to send the network > > > packets more efficient? > > What kernel version are you using? Are you using the in-kernel > ath9k or > > are you using compat-wireless? I have added quite a few performance > > optimizations over time, as I'm working with much slower MIPS > CPUs than > > the octeon. > > In my tests, a 300 MHz MIPS 24K CPU is good enough for handling > around > > 90 mbit/s of traffic with only around 70% CPU utilization. > > > > - Felix > > > > > > Now thats interesting Felix :) , how have you managed to get all > these? > What do you mean with 'get all these'? > > - Felix > > > Sorry, I am new to these things; what I wanted to ask you was that > with the kind of CPU info that you have; how were you able to get 90 > mbit/s of traffic. I am using a much faster CPU with 1.66 Ghz 512K > still I usually get 65mbit/s. I am using in-kernel ath9K. Are you > using compat-wireless? Are there any other changes that you have > made to your system? The device I used was using an AR7130 MIPS CPU. I set it up as an access point (with 4addr/wds mode enabled), then used another device as a 4-addr client. Both were set up for bridging wireless to wired. After that I ran iperf TCP sessions between two laptops (each connected to one of the embedded devices).
Thanks Felix. I set up an Access point with master mode enables (with the help of hostapd). > I have no idea if we can make the tx bitrate stable? If you have > done that, kindly share. Are you using the ath9k rate control or are you using minstrel_ht? My tests were done with minstrel_ht. You can enable it by disabling the config option for the ath9k rate control. My client had an intel card which uses it own rate control so I am using a USB wireless card now which uses minstrel but my Access point on the other hand uses ath9k_rate_control. I guess I should make them both use the same rate control algo. --SGS
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