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Date:      Thu, 2 Mar 2017 23:25:03 -0300
From:      =?UTF-8?B?T3RhY8OtbGlv?= <otacilio.neto@bsd.com.br>
To:        "freebsd-wireless@freebsd.org" <freebsd-wireless@freebsd.org>
Subject:   Low performance on rtwn_usb
Message-ID:  <38d16a0b-f60c-4303-f167-9d7ae0e876d7@bsd.com.br>

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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@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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