====== WiFi 성능 테스트 ======
Wi-Fi 모듈을 측정한 결과를 정리하였다.
현재 검토 중인 Chipset은 Broadcom 과 Realtek 이다. Chip Spec 는 다음과 같다.
| Chipset | BCM43362 |
| 802.11 Spec | b/g/n 2.4GHz |
| Interface | SDIO |
| Antenna | 1 by 1 |
====== 테스트 환경 검증 ======
쉴드룸 상황과 일반 사무실 환경이 어느 정도 차이가 나는지 측정했다. 일반적인 throughput 이 아닌 신호 세기와 감도를 확인하기 위해 진행했다.
다음의 몇가지 상황에 따라 측정했다.
참고로 Built-in Wi-Fi 는 802.11b/g 만 지원하고, IPTIME Wi-Fi 는 802.11b/g/n 을 지원하기 때문에 각각 공유기 설정을 'g/n 모드' 그리고 'n only' 로 설정했다.
===== 쉴드룸 =====
==== Wi-Fi 만 있을 경우 ====
=== Built-in Wi-Fi ===
root@debian:~# iwconfig wlan0
wlan0 IEEE 802.11bg ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=20 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
root@debian:~# iwlist wlan0 scan
wlan0 No scan results
=== IPTIME Wi-Fi ===
root@debian:~# iwconfig ra0
ra0 Ralink STA ESSID:"" Nickname:"RT2870STA"
Mode:Auto Frequency=2.412 GHz Bit Rate=1 Mb/s
RTS thr:off Fragment thr:off
Encryption key:off
Link Quality=10/100 Signal level:0 dBm Noise level:0 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
root@debian:~# iwlist ra0 scan
ra0 No scan results
==== Wi-Fi 와 AP 가 있는 경우(접속안함) ====
=== Built-in Wi-Fi ===
root@debian:~# iwconfig wlan0
wlan0 IEEE 802.11bg ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=20 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
root@debian:~# iwlist wlan0 scan
wlan0 Scan completed :
Cell 01 - Address: 00:26:66:AA:E7:B4
Channel:9
Frequency:2.452 GHz (Channel 9)
Quality=39/70 Signal level=-71 dBm
Encryption key:off
ESSID:"ttt"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=000000000b3c9173
Extra: Last beacon: 112ms ago
IE: Unknown: 0003747474
IE: Unknown: 010882848B960C121824
IE: Unknown: 030109
IE: Unknown: 2A0100
IE: Unknown: 32043048606C
IE: Unknown: 2D1A6E181AFFFF000000000000000000000000000000000000000000
IE: Unknown: 3D1609050000000000000000000000000000000000000000
IE: Unknown: DD180050F2020101000003A4000027A4000042435E0062322F00
IE: Unknown: DD9E0050F204104A0001101044000102103B0001031047001063041253101920061228AABBCCDDEEFF1021001B5265616C74656B2053656D69636F6E647563746F7220436F72702E1023000752544C387878781024000D45562D323030392D30322D30361042000F3132333435363738393031323334371054000800060050F2040001101100135265616C74656B20576972656C657373204150100800020086
IE: Unknown: DD1E00904C336E181AFFFF000000000000000000000000000000000000000000
IE: Unknown: DD1A00904C3409050000000000000000000000000000000000000000
IE: Unknown: DD0600E04C020160
=== IPTIME Wi-Fi ===
root@debian:~# iwconfig ra0
ra0 Ralink STA ESSID:"" Nickname:"RT2870STA"
Mode:Auto Frequency=2.412 GHz Bit Rate=1 Mb/s
RTS thr:off Fragment thr:off
Encryption key:off
Link Quality=10/100 Signal level:0 dBm Noise level:0 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
root@debian:~# iwlist ra0 scan
ra0 Scan completed :
Cell 01 - Address: 00:26:66:AA:E7:B4
Protocol:802.11b/g/n
ESSID:"ttt"
Mode:Managed
Frequency:2.452 GHz (Channel 9)
Quality=100/100 Signal level=-27 dBm Noise level=-92 dBm
Encryption key:off
Bit Rates:54 Mb/s
IE: Unknown: DD0E0050F204104A0001101044000102
==== Wi-Fi 가 AP 에 접속한 경우 ====
=== Built-in Wi-Fi ===
root@debian:/# iwconfig wlan0
wlan0 IEEE 802.11bg ESSID:"ttt"
Mode:Managed Frequency:2.412 GHz Access Point: 00:26:66:AA:E7:B4
Bit Rate=1 Mb/s Tx-Power=20 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality=70/70 Signal level=-35 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
root@debian:/# iwlist wlan0 scan
wlan0 Scan completed :
Cell 01 - Address: 00:26:66:AA:E7:B4
Channel:1
Frequency:2.412 GHz (Channel 1)
Quality=70/70 Signal level=-37 dBm
Encryption key:off
ESSID:"ttt"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=0000000001e428b2
Extra: Last beacon: 8ms ago
IE: Unknown: 0003747474
IE: Unknown: 010882848B960C121824
IE: Unknown: 030101
IE: Unknown: 2A0100
IE: Unknown: 32043048606C
IE: Unknown: 2D1A6E181AFFFF000000000000000000000000000000000000000000
IE: Unknown: 3D1601050300000000000000000000000000000000000000
IE: Unknown: DD180050F2020101000003A4000027A4000042435E0062322F00
IE: Unknown: DD9E0050F204104A0001101044000102103B0001031047001063041253101920061228AABBCCDDEEFF1021001B5265616C74656B2053656D69636F6E647563746F7220436F72702E1023000752544C387878781024000D45562D323030392D30322D30361042000F3132333435363738393031323334371054000800060050F2040001101100135265616C74656B20576972656C657373204150100800020086
IE: Unknown: DD1E00904C336E181AFFFF000000000000000000000000000000000000000000
IE: Unknown: DD1A00904C3401050300000000000000000000000000000000000000
IE: Unknown: DD0600E04C020160
root@debian:/#
root@debian:/# iwconfig wlan0
wlan0 IEEE 802.11bg ESSID:"ttt"
Mode:Managed Frequency:2.412 GHz Access Point: 00:26:66:AA:E7:B4
Bit Rate=1 Mb/s Tx-Power=20 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality=70/70 Signal level=-20 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
=== IPTIME Wi-Fi ===
root@debian:/# iwconfig ra0 essid ttt
root@debian:/# dhclient ra0
root@debian:/# iwconfig ra0
ra0 Ralink STA ESSID:"ttt" Nickname:"RT2870STA"
Mode:Managed Frequency=2.452 GHz Access Point: 00:26:66:AA:E7:B4
Bit Rate=135 Mb/s
RTS thr:off Fragment thr:off
Encryption key:off
Link Quality=100/100 Signal level:-25 dBm Noise level:-25 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
root@debian:/# iwlist ra0 scan
ra0 Scan completed :
Cell 01 - Address: 00:26:66:AA:E7:B4
Protocol:802.11b/g/n
ESSID:"ttt"
Mode:Managed
Frequency:2.452 GHz (Channel 9)
Quality=100/100 Signal level=-27 dBm Noise level=-92 dBm
Encryption key:off
Bit Rates:54 Mb/s
IE: Unknown: DD0E0050F204104A0001101044000102
root@debian:/#
root@debian:/# iwconfig ra0
ra0 Ralink STA ESSID:"ttt" Nickname:"RT2870STA"
Mode:Managed Frequency=2.452 GHz Access Point: 00:26:66:AA:E7:B4
Bit Rate=135 Mb/s
RTS thr:off Fragment thr:off
Encryption key:off
Link Quality=100/100 Signal level:-20 dBm Noise level:-50 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
==== 실험 결과 ====
=== Built-in Wi-Fi ===
| 항목 | 접속 전 | 접속 후 |
| TX Power | 20 | 20 |
| Link Quality | 없음 | 70/70 |
| Signal level | 없음 | -35 ~ -20 dBm |
| Bit Rate | 없음 | 1 Mb/s |
=== IPTIME Wi-Fi ===
| 항목 | 접속 전 | 접속 후 |
| TX Power | 없음 | 없음 |
| Link Quality | 10/100 | 100/100 |
| Signal level | 0 dBm | -25 ~ -20 dBm |
| Bit Rate | 1 Mb/s | 135 Mb/s |
| Noise level | 0 dBm | -25 ~ -50 dBm |
===== 사무실 환경 =====
같은 테스트를 이번에는 사무실 환경에서 진행했다.
==== Built-in Wi-Fi ====
# iwlist wlan0 scan
Cell 20 - Address: 00:26:66:AA:E7:B4
Channel:13
Frequency:2.472 GHz (Channel 13)
Quality=57/70 Signal level=-53 dBm
Encryption key:off
ESSID:"ttt"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=00000000907ef15d
Extra: Last beacon: 156ms ago
IE: Unknown: 0003747474
IE: Unknown: 010882848B960C121824
IE: Unknown: 03010D
IE: Unknown: 2A0100
IE: Unknown: 32043048606C
IE: Unknown: 2D1A6E181AFFFF000000000000000000000000000000000000000000
IE: Unknown: 3D160D070000000000000000000000000000000000000000
IE: Unknown: DD180050F2020101000003A4000027A4000042435E0062322F00
IE: Unknown: DD9E0050F204104A0001101044000102103B0001031047001063041253101920061228AABBCCDDEEFF1021001B5265616C74656B2053656D69636F6E647563746F7220436F72702E1023000752544C387878781024000D45562D323030392D30322D30361042000F3132333435363738393031323334371054000800060050F2040001101100135265616C74656B20576972656C657373204150100800020086
IE: Unknown: DD1E00904C336E181AFFFF000000000000000000000000000000000000000000
IE: Unknown: DD1A00904C340D070000000000000000000000000000000000000000
IE: Unknown: DD0600E04C020160
# iwconfig wlan0 essid ttt
# iwconfig wlan0
wlan0 IEEE 802.11bg ESSID:"ttt"
Mode:Managed Frequency:2.472 GHz Access Point: 00:26:66:AA:E7:B4
Bit Rate=54 Mb/s Tx-Power=20 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality=65/70 Signal level=-45 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
root@debian:~/wifi_company# iwconfig wlan0
wlan0 IEEE 802.11bg ESSID:"ttt"
Mode:Managed Frequency:2.472 GHz Access Point: 00:26:66:AA:E7:B4
Bit Rate=54 Mb/s Tx-Power=20 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality=66/70 Signal level=-44 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
root@debian:~/wifi_company# iwconfig wlan0
wlan0 IEEE 802.11bg ESSID:"ttt"
Mode:Managed Frequency:2.472 GHz Access Point: 00:26:66:AA:E7:B4
Bit Rate=54 Mb/s Tx-Power=20 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality=67/70 Signal level=-43 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
==== IPTIME Wi-Fi ====
# iwconfig ra0
ra0 Ralink STA ESSID:"" Nickname:"RT2870STA"
Mode:Auto Frequency=2.412 GHz Bit Rate=1 Mb/s
RTS thr:off Fragment thr:off
Encryption key:off
Link Quality=10/100 Signal level:0 dBm Noise level:0 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
# iwlist ra0 scan
Cell 03 - Address: 00:26:66:AA:E7:B4
Protocol:802.11b/g/n
ESSID:"ttt"
Mode:Managed
Frequency:2.472 GHz (Channel 13)
Quality=23/100 Signal level=-81 dBm Noise level=-86 dBm
Encryption key:off
Bit Rates:54 Mb/s
IE: Unknown: DD0E0050F204104A0001101044000102
# iwconfig ra0 essid ttt
oot@debian:~/wifi_company# iwconfig ra0
ra0 Ralink STA ESSID:"ttt" Nickname:"RT2870STA"
Mode:Managed Frequency=2.472 GHz Access Point: 00:26:66:AA:E7:B4
Bit Rate=135 Mb/s
RTS thr:off Fragment thr:off
Encryption key:off
Link Quality=100/100 Signal level:-54 dBm Noise level:-72 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
root@debian:~/wifi_company# iwconfig ra0
ra0 Ralink STA ESSID:"ttt" Nickname:"RT2870STA"
Mode:Managed Frequency=2.472 GHz Access Point: 00:26:66:AA:E7:B4
Bit Rate=135 Mb/s
RTS thr:off Fragment thr:off
Encryption key:off
Link Quality=100/100 Signal level:-54 dBm Noise level:-74 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
root@debian:~/wifi_company# iwconfig ra0
ra0 Ralink STA ESSID:"ttt" Nickname:"RT2870STA"
Mode:Managed Frequency=2.472 GHz Access Point: 00:26:66:AA:E7:B4
Bit Rate=135 Mb/s
RTS thr:off Fragment thr:off
Encryption key:off
Link Quality=88/100 Signal level:-52 dBm Noise level:-72 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
==== 실험 결과 ====
=== Built-in Wi-Fi ===
| 항목 | 접속 전 | 접속 후 |
| TX Power | 20 | 20 |
| Link Quality | 없음 | 65~67/70 |
| Signal level | 없음 | -43 ~ -45 dBm |
| Bit Rate | 없음 | 54 Mb/s |
=== IPTIME Wi-Fi ===
| 항목 | 접속 전 | 접속 후 |
| TX Power | 없음 | 없음 |
| Link Quality | 10/100 | 88~100/100 |
| Signal level | 0 dBm | -52 ~ -54 dBm |
| Bit Rate | 1 Mb/s | 135 Mb/s |
| Noise level | 0 dBm | -72 ~ -74 dBm |
====== IPTIME N150UA ======
IPTIME 에서 나온 USB 타입의 WiFi 동글이다. 칩은 ralink5370 을 사용한다.
===== 드라이버 포팅하기 =====
먼저 IPTIME 홈페이지에서 해당 리눅스 드라이버를 다운로드 한다.
압축을 풀고, make 를 실행하면 되는데, 여기서 선행되어야 할 것이 있다.
#cd 2011_0719_RT3070_RT3370_RT5370_RT5372_Linux_STA_V2.5.0.3_DPO
#mkdir -p /etc/Wireless/RT2870STA
#cp RT2870STA.dat /etc/Wireless/RT2870STA/
#insmod rt5370sta.ko
#ifconfig ra0 up
만일 ra0 인터페이스가 올라오지 않는다면, dmesg 를 통해 커널메세지를 확인하자.
==== 부팅시 자동으로 모듈 로딩하기 ====
#cp rt5370sta.ko /lib/modules/3.5.0-24-generic/kernel/drivers/net/wireless
#depmod -a
#vi /etc/modules
아래와 같이 추가한다.
rt5370sta
====== Broadcom 43362 ======
지금까지 두번에 걸쳐 성능 테스트를 했다.
첫번째는 일반 사무실 환경에서 했고, 두번째는 쉴드룸 환경에서 진행했다. 먼저 BCM 으로부터 받은 사전 성능 데이터를 참고했다. {{ :computer:job:itx:bcm43362_throughput.pdf |}}
- 일반 사무실 환경 성능 테스트 {{ :computer:job:itx:wifi_result_nomal.odt |}}
- 쉴드룸 환경 성능 테스트 {{ :computer:job:itx:wifi_result_shelidrom.odt |}}
===== 현재 상황 =====
BCM 자료와 비교해볼때, 쉴드룸 환경에서 RX 가 절반 정도밖에 나오지 않고 있다. 개선되어야 할 부분이다.
====== Realtek ======
====== 고려해야할 사항 ======
- 최소 기준 throughput 은 얼마로 할 것인가? 현재 유선랜에서의 throughput 은 얼마인가? 저장되는 스트림의 data rate 은 얼마인가?
- 몇 개까지 지원할 것인가?
- Wi-Fi 인증을 받을 것인가?
- 어떤 기능까지 지원할 것인가?
- AP or Soft AP 기능을 사용할 것인가?
====== 확인해 볼 사항 ======
- IP 카메라와 NVR 간에 성능 측정(Throughput, CPU Usage)
====== 성능 측정 결과 ======
===== 무선 카메라(2013.09.09) =====
WIFI High Speed Mode 를 비활성화(disable)한 펌웨어로 무선 성능을 측정한 결과는 다음과 같다. 수정사항은 [[dm368_사용하기_개정판|]] 를 참조한다.
- 쉴드룸(8층)
- AP 공유기 : IPTIME N804, 암호없음, 802.11 b/g/n 으로 설정
- Carmera App 를 실행하지 않고, 커널부팅 후 바로 Throughput 측정함
- TX/RX 각각 300초(5분) 동안 측정함
| TX(CPU Usage) | RX(CPU Usage) | 비고 |
| 16.5(60%) | 11.1(40%) | TX(최고 : 16.8 Mbps, 최저 : 15.7 Mbps), RX(최고 : 13.5 Mbps, 최저 : 2.22 Mbps) |
측정 결과, TX 의 경우 기존과 동일한 결과를 나타냈으며 RX 의 경우, 큰 편차가 발생하나, 발생 빈도가 기존에 비해 줄었다.
===== 무선 카메라(2013.07.25) =====
OQC 시료를 사용하여 무선 성능 측정을 하였다. 기존대로 SDIO Clock 을 50 MHz 로 설정했을 때, 통신 도중 죽거나, 드라이버가 다운되는 문제가 있어 Clock 을 각각, 5/10/15 MHz 로 변경하여 측정하였다.
==== 50 MHz 설정 ====
=== 1번 시료 ===
| TX(CPU Usage) | RX(CPU Usage) | 비고 |
| 17.2(80%) | 13.0(55%) | |
=== 2번 시료 ===
| TX(CPU Usage) | RX(CPU Usage) | 비고 |
| 13.8(55%) | 12.1(30%) | |
=== 3번 시료 ===
| TX(CPU Usage) | RX(CPU Usage) | 비고 |
| 19.9(98%) | 16.8(65%) | |
==== 15 MHz 설정 ====
| TX(CPU Usage) | RX(CPU Usage) | 비고 |
| 18.4(70%) | 14.3(35~40%) | |
==== 10 MHz 설정 ====
| TX(CPU Usage) | RX(CPU Usage) | 비고 |
| 15.0(70%) | 13.8(35~40%) | |
==== 5 MHz 설정 ====
| TX(CPU Usage) | RX(CPU Usage) | 비고 |
| 9.74(35~40%) | 9.34(35~40%) | |
===== 지능형 카메라(2013.05.28) =====
성능 측정 결과를 {{ :computer:job:itx:wifi_dongle_realtek_0528.doc |}} 파일에 작성했다.
===== 무선 카메라(2013.05.14) =====
MMC Clock 을 조절 했을 때, 다음과 같이 결과가 나왔다. drivers/mmc/core/sdio.c 파일을 다음과 같이 수정했다.
static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
{
unsigned max_dtr;
if (mmc_card_highspeed(card)) {
/*
* The SDIO specification doesn't mention how
* the CIS transfer speed register relates to
* high-speed, but it seems that 50 MHz is
* mandatory.
*/
// max_dtr = 50000000;
max_dtr = 35000000; // wjkim
// max_dtr = 25000000; // wjkim
// max_dtr = 15000000; // wjkim
printk("max_dtr ####################### %d \n", max_dtr);
} else {
max_dtr = card->cis.max_dtr;
}
if (card->type == MMC_TYPE_SD_COMBO)
max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
return max_dtr;
}
==== 50 MHz 설정 ====
| TX(CPU Usage) | RX(CPU Usage) | 비고 |
| 24.7(95~98%) | 13.4(15%) | RX 측정 시, 도중 끊어지는 문제 발생함 |
==== 35 MHz 설정 ====
| TX(CPU Usage) | RX(CPU Usage) | 비고 |
| 22.7(90%) | 15.7(30%) | |
==== 25 MHz 설정 ====
| TX(CPU Usage) | RX(CPU Usage) | 비고 |
| 19.1(70%) | 15.6(35~40%) | |
==== 15 MHz 설정 ====
| TX(CPU Usage) | RX(CPU Usage) | 비고 |
| 19.4(70%) | 14.7(35~40%) | |
측정 결과, 35 MHz 에서 가장 안정적이고도, 높은 성능을 나타냈다. 따라서 35 MHz 로 설정했다.
----
{{indexmenu>:#1|skipns=/^(wiki|etc|diary|playground)$/ skipfile=/^(todays|about|guestbook)$/ nsort rsort}}
----