Low performance on rtwn_usb

[Andriy Voskoboinyk]

Fri, 03 Mar 2017 08:59:18 +0200 було написано Andriy Voskoboinyk  
<avos at freebsd.org>:

> Fri, 03 Mar 2017 04:25:03 +0200 було написано Otacílio  
> <otacilio.neto at bsd.com.br>:
>
>> > ieee80211_load_module: load the wlan_amrr module by hand for now.
>
> Without wlan_amrr module default rate will be set to some fixed value
> (1 MBps for 11g, 6 MBps for 11a) (can be modified via
> ucastrate / mcastrate / mgtrate ifconfig(8) parameters).
>
> For now, there are only 2 possibilites:
> 1) Kldload / add wlan_amrr to kld_list & use wlan_amrr for automatic
> rate adaptation (current activity can be seen via
> 'wlandebug -i wlan0 rate')
> 2) Set the rate manually via ifconfig(8) (disables automatic rate
> adaptation; use 'ifconfig wlan0 *rate -' to return to it).

3) (for rtwn(4) only) Set dev.rtwn.%d.ratectl tunable to 0 -
then driver will use MCS4 for 11n, OFDM 36 for 11g/11a and CCK5.5 for
11b (hardcoded, still may be overridden via ifconfig(8))


>> Dears
>>
>> I'm using a USB wifi dongle to connect my baglebone black. This dongle  
>> uses the driver rtwn/rtwn_usb.
>>
>> This driver exhibits a very low performance on both, beaglebone and a  
>> Intel Core 2 Duo notebook. With -ht and without -ht on the ficonfig the  
>> performance is something like this:
>>
>> root at beaglebone:/usr/home/ota # netperf -H nostromo
>> MIGRATED TCP STREAM TEST from 0.0.0.0 () port 0 AF_INET to nostromo ()  
>> port 0 AF_INET : histogram : interval : dirty data : demo
>> Recv   Send    Send
>> Socket Socket  Message  Elapsed
>> Size   Size    Size     Time     Throughput
>> bytes  bytes   bytes    secs.    10^6bits/sec
>>
>>   65536  32768  32768    10.91       0.49
>>
>> The dongle is this
>>
>> ugen1.2: <vendor 0x0bda product 0x8176> at usbus1
>> rtwn0 on uhub1
>> rtwn0: <vendor 0x0bda product 0x8176, class 0/0, rev 2.00/2.00, addr 2>  
>> on usbus1
>> rtwn0: MAC/BB RTL8188CUS, RF 6052 1T1R
>> ieee80211_load_module: load the wlan_amrr module by hand for now.
>> wlan0: Ethernet address: 80:3f:5d:11:28:e6
>>
>> Someone can give me a hint to enhance performance? Previously, with  
>> urtw the throughput was about MBPs.
>>
>> []'s
>>
>> -Otacilio
>>
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