wifi ping延时大的问题

        客户有一款hud抬头显示设备，连接我方wifi设备后，ping延时很大1秒多，TCP传输抬头显示数据延时卡顿很强烈，拿到HUD设备开始测试3款ublox wifi：

        问题总结：hud设备在g/n制式上由于MCU算力较弱导致延时过大，改为11b正常。

W374 WPA2测试

64 bytes from 192.168.110.110: icmp_seq=9 ttl=255 time=81.5 ms
64 bytes from 192.168.110.110: icmp_seq=10 ttl=255 time=25.3 ms
64 bytes from 192.168.110.110: icmp_seq=11 ttl=255 time=2.52 ms
64 bytes from 192.168.110.110: icmp_seq=12 ttl=255 time=14.1 ms
64 bytes from 192.168.110.110: icmp_seq=13 ttl=255 time=69.0 ms
64 bytes from 192.168.110.110: icmp_seq=14 ttl=255 time=105 ms
64 bytes from 192.168.110.110: icmp_seq=15 ttl=255 time=48.1 ms
64 bytes from 192.168.110.110: icmp_seq=16 ttl=255 time=91.4 ms
64 bytes from 192.168.110.110: icmp_seq=17 ttl=255 time=36.2 ms
64 bytes from 192.168.110.110: icmp_seq=18 ttl=255 time=84.0 ms
64 bytes from 192.168.110.110: icmp_seq=19 ttl=255 time=27.4 ms
64 bytes from 192.168.110.110: icmp_seq=20 ttl=255 time=73.3 ms
64 bytes from 192.168.110.110: icmp_seq=21 ttl=255 time=15.6 ms
64 bytes from 192.168.110.110: icmp_seq=22 ttl=255 time=64.0 ms
64 bytes from 192.168.110.110: icmp_seq=23 ttl=255 time=6.41 ms
64 bytes from 192.168.110.110: icmp_seq=24 ttl=255 time=55.1 ms
64 bytes from 192.168.110.110: icmp_seq=25 ttl=255 time=98.2 ms
64 bytes from 192.168.110.110: icmp_seq=26 ttl=255 time=34.4 ms
64 bytes from 192.168.110.110: icmp_seq=27 ttl=255 time=87.1 ms
64 bytes from 192.168.110.110: icmp_seq=28 ttl=255 time=30.1 ms
64 bytes from 192.168.110.110: icmp_seq=29 ttl=255 time=1202 ms
64 bytes from 192.168.110.110: icmp_seq=30 ttl=255 time=939 ms
64 bytes from 192.168.110.110: icmp_seq=31 ttl=255 time=1194 ms
64 bytes from 192.168.110.110: icmp_seq=32 ttl=255 time=1138 ms
64 bytes from 192.168.110.110: icmp_seq=33 ttl=255 time=980 ms
64 bytes from 192.168.110.110: icmp_seq=34 ttl=255 time=132 ms
64 bytes from 192.168.110.110: icmp_seq=35 ttl=255 time=1178 ms
64 bytes from 192.168.110.110: icmp_seq=36 ttl=255 time=923 ms
64 bytes from 192.168.110.110: icmp_seq=37 ttl=255 time=1170 ms

W374 WPA1测试

64 bytes from 192.168.110.110: icmp_seq=51 ttl=255 time=37.4 ms
64 bytes from 192.168.110.110: icmp_seq=52 ttl=255 time=25.4 ms
64 bytes from 192.168.110.110: icmp_seq=53 ttl=255 time=41.3 ms
64 bytes from 192.168.110.110: icmp_seq=54 ttl=255 time=1.36 ms
64 bytes from 192.168.110.110: icmp_seq=55 ttl=255 time=93.5 ms
64 bytes from 192.168.110.110: icmp_seq=56 ttl=255 time=6.91 ms
64 bytes from 192.168.110.110: icmp_seq=57 ttl=255 time=36.5 ms
64 bytes from 192.168.110.110: icmp_seq=58 ttl=255 time=59.4 ms
64 bytes from 192.168.110.110: icmp_seq=59 ttl=255 time=92.2 ms
64 bytes from 192.168.110.110: icmp_seq=60 ttl=255 time=104 ms
64 bytes from 192.168.110.110: icmp_seq=61 ttl=255 time=24.5 ms
64 bytes from 192.168.110.110: icmp_seq=62 ttl=255 time=46.6 ms
64 bytes from 192.168.110.110: icmp_seq=63 ttl=255 time=70.0 ms
64 bytes from 192.168.110.110: icmp_seq=64 ttl=255 time=91.7 ms
64 bytes from 192.168.110.110: icmp_seq=65 ttl=255 time=11.1 ms
64 bytes from 192.168.110.110: icmp_seq=66 ttl=255 time=33.9 ms
64 bytes from 192.168.110.110: icmp_seq=67 ttl=255 time=59.3 ms
64 bytes from 192.168.110.110: icmp_seq=68 ttl=255 time=84.1 ms
64 bytes from 192.168.110.110: icmp_seq=69 ttl=255 time=102 ms
64 bytes from 192.168.110.110: icmp_seq=70 ttl=255 time=24.0 ms
64 bytes from 192.168.110.110: icmp_seq=71 ttl=255 time=45.8 ms
64 bytes from 192.168.110.110: icmp_seq=72 ttl=255 time=70.4 ms
64 bytes from 192.168.110.110: icmp_seq=73 ttl=255 time=124 ms
64 bytes from 192.168.110.110: icmp_seq=74 ttl=255 time=1036 ms
64 bytes from 192.168.110.110: icmp_seq=75 ttl=255 time=1051 ms
64 bytes from 192.168.110.110: icmp_seq=76 ttl=255 time=1074 ms
64 bytes from 192.168.110.110: icmp_seq=77 ttl=255 time=1096 ms
64 bytes from 192.168.110.110: icmp_seq=78 ttl=255 time=192 ms
64 bytes from 192.168.110.110: icmp_seq=79 ttl=255 time=1048 ms
64 bytes from 192.168.110.110: icmp_seq=80 ttl=255 time=1061 ms
64 bytes from 192.168.110.110: icmp_seq=81 ttl=255 time=1081 ms
64 bytes from 192.168.110.110: icmp_seq=82 ttl=255 time=1103 ms
64 bytes from 192.168.110.110: icmp_seq=83 ttl=255 time=1025 ms
64 bytes from 192.168.110.110: icmp_seq=84 ttl=255 time=1047 ms
64 bytes from 192.168.110.110: icmp_seq=85 ttl=255 time=967 ms
64 bytes from 192.168.110.110: icmp_seq=86 ttl=255 time=174 ms
64 bytes from 192.168.110.110: icmp_seq=87 ttl=255 time=199 ms
64 bytes from 192.168.110.110: icmp_seq=88 ttl=255 time=658 ms
64 bytes from 192.168.110.110: icmp_seq=89 ttl=255 time=552 ms
64 bytes from 192.168.110.110: icmp_seq=90 ttl=255 time=162 ms
64 bytes from 192.168.110.110: icmp_seq=91 ttl=255 time=493 ms
64 bytes from 192.168.110.110: icmp_seq=92 ttl=255 time=412 ms
64 bytes from 192.168.110.110: icmp_seq=93 ttl=255 time=1049 ms
64 bytes from 192.168.110.110: icmp_seq=94 ttl=255 time=663 ms
64 bytes from 192.168.110.110: icmp_seq=95 ttl=255 time=1092 ms
64 bytes from 192.168.110.110: icmp_seq=96 ttl=255 time=332 ms
64 bytes from 192.168.110.110: icmp_seq=97 ttl=255 time=1036 ms
64 bytes from 192.168.110.110: icmp_seq=98 ttl=255 time=1061 ms
64 bytes from 192.168.110.110: icmp_seq=99 ttl=255 time=82.9 ms
64 bytes from 192.168.110.110: icmp_seq=100 ttl=255 time=1106 ms
64 bytes from 192.168.110.110: icmp_seq=101 ttl=255 time=1021 ms
64 bytes from 192.168.110.110: icmp_seq=102 ttl=255 time=1145 ms
64 bytes from 192.168.110.110: icmp_seq=103 ttl=255 time=1065 ms
64 bytes from 192.168.110.110: icmp_seq=105 ttl=255 time=2064 ms
64 bytes from 192.168.110.110: icmp_seq=106 ttl=255 time=1060 ms
64 bytes from 192.168.110.110: icmp_seq=107 ttl=255 time=1053 ms
64 bytes from 192.168.110.110: icmp_seq=108 ttl=255 time=1076 ms
64 bytes from 192.168.110.110: icmp_seq=109 ttl=255 time=168 ms

W263 WPA2测试

64 bytes from 192.168.110.110: icmp_seq=37 ttl=255 time=28.3 ms
64 bytes from 192.168.110.110: icmp_seq=38 ttl=255 time=56.0 ms
64 bytes from 192.168.110.110: icmp_seq=39 ttl=255 time=74.2 ms
64 bytes from 192.168.110.110: icmp_seq=40 ttl=255 time=86.8 ms
64 bytes from 192.168.110.110: icmp_seq=41 ttl=255 time=7.17 ms
64 bytes from 192.168.110.110: icmp_seq=42 ttl=255 time=1154 ms
64 bytes from 192.168.110.110: icmp_seq=43 ttl=255 time=1028 ms
64 bytes from 192.168.110.110: icmp_seq=44 ttl=255 time=120 ms
64 bytes from 192.168.110.110: icmp_seq=45 ttl=255 time=1071 ms
64 bytes from 192.168.110.110: icmp_seq=46 ttl=255 time=859 ms
64 bytes from 192.168.110.110: icmp_seq=47 ttl=255 time=1189 ms
64 bytes from 192.168.110.110: icmp_seq=48 ttl=255 time=1035 ms
64 bytes from 192.168.110.110: icmp_seq=49 ttl=255 time=862 ms
64 bytes from 192.168.110.110: icmp_seq=50 ttl=255 time=1080 ms
64 bytes from 192.168.110.110: icmp_seq=51 ttl=255 time=648 ms
64 bytes from 192.168.110.110: icmp_seq=52 ttl=255 time=884 ms
64 bytes from 192.168.110.110: icmp_seq=53 ttl=255 time=189 ms
64 bytes from 192.168.110.110: icmp_seq=54 ttl=255 time=419 ms
64 bytes from 192.168.110.110: icmp_seq=55 ttl=255 time=871 ms
64 bytes from 192.168.110.110: icmp_seq=56 ttl=255 time=1180 ms
64 bytes from 192.168.110.110: icmp_seq=57 ttl=255 time=201 ms
64 bytes from 192.168.110.110: icmp_seq=58 ttl=255 time=1152 ms
64 bytes from 192.168.110.110: icmp_seq=59 ttl=255 time=101 ms
64 bytes from 192.168.110.110: icmp_seq=60 ttl=255 time=93.7 ms
64 bytes from 192.168.110.110: icmp_seq=61 ttl=255 time=1137 ms
64 bytes from 192.168.110.110: icmp_seq=62 ttl=255 time=1025 ms
64 bytes from 192.168.110.110: icmp_seq=63 ttl=255 time=1051 ms
64 bytes from 192.168.110.110: icmp_seq=64 ttl=255 time=1080 ms
64 bytes from 192.168.110.110: icmp_seq=65 ttl=255 time=78.7 ms
64 bytes from 192.168.110.110: icmp_seq=66 ttl=255 time=92.2 ms
64 bytes from 192.168.110.110: icmp_seq=67 ttl=255 time=1136 ms
64 bytes from 192.168.110.110: icmp_seq=68 ttl=255 time=1088 ms
64 bytes from 192.168.110.110: icmp_seq=69 ttl=255 time=206 ms
64 bytes from 192.168.110.110: icmp_seq=70 ttl=255 time=1132 ms
64 bytes from 192.168.110.110: icmp_seq=71 ttl=255 time=937 ms
64 bytes from 192.168.110.110: icmp_seq=72 ttl=255 time=747 ms
64 bytes from 192.168.110.110: icmp_seq=73 ttl=255 time=1062 ms
64 bytes from 192.168.110.110: icmp_seq=74 ttl=255 time=1050 ms

W263 WPA1测试【正常】

64 bytes from 192.168.110.110: icmp_seq=142 ttl=255 time=42.7 ms
64 bytes from 192.168.110.110: icmp_seq=143 ttl=255 time=63.8 ms
64 bytes from 192.168.110.110: icmp_seq=144 ttl=255 time=101 ms
64 bytes from 192.168.110.110: icmp_seq=145 ttl=255 time=111 ms
64 bytes from 192.168.110.110: icmp_seq=146 ttl=255 time=27.0 ms
64 bytes from 192.168.110.110: icmp_seq=147 ttl=255 time=51.2 ms
64 bytes from 192.168.110.110: icmp_seq=148 ttl=255 time=78.3 ms
64 bytes from 192.168.110.110: icmp_seq=149 ttl=255 time=200 ms
64 bytes from 192.168.110.110: icmp_seq=150 ttl=255 time=41.4 ms
64 bytes from 192.168.110.110: icmp_seq=151 ttl=255 time=41.6 ms
64 bytes from 192.168.110.110: icmp_seq=152 ttl=255 time=59.9 ms
64 bytes from 192.168.110.110: icmp_seq=153 ttl=255 time=85.8 ms
64 bytes from 192.168.110.110: icmp_seq=154 ttl=255 time=106 ms
64 bytes from 192.168.110.110: icmp_seq=155 ttl=255 time=23.9 ms
64 bytes from 192.168.110.110: icmp_seq=156 ttl=255 time=69.5 ms
64 bytes from 192.168.110.110: icmp_seq=157 ttl=255 time=78.3 ms
64 bytes from 192.168.110.110: icmp_seq=158 ttl=255 time=96.7 ms
64 bytes from 192.168.110.110: icmp_seq=159 ttl=255 time=14.5 ms
64 bytes from 192.168.110.110: icmp_seq=160 ttl=255 time=39.8 ms
64 bytes from 192.168.110.110: icmp_seq=161 ttl=255 time=62.2 ms
64 bytes from 192.168.110.110: icmp_seq=162 ttl=255 time=85.4 ms
64 bytes from 192.168.110.110: icmp_seq=163 ttl=255 time=118 ms
64 bytes from 192.168.110.110: icmp_seq=164 ttl=255 time=43.4 ms
64 bytes from 192.168.110.110: icmp_seq=165 ttl=255 time=146 ms
64 bytes from 192.168.110.110: icmp_seq=166 ttl=255 time=72.5 ms
64 bytes from 192.168.110.110: icmp_seq=167 ttl=255 time=103 ms
64 bytes from 192.168.110.110: icmp_seq=168 ttl=255 time=15.1 ms
64 bytes from 192.168.110.110: icmp_seq=169 ttl=255 time=38.9 ms
64 bytes from 192.168.110.110: icmp_seq=170 ttl=255 time=56.5 ms
64 bytes from 192.168.110.110: icmp_seq=171 ttl=255 time=100 ms
64 bytes from 192.168.110.110: icmp_seq=172 ttl=255 time=106 ms
64 bytes from 192.168.110.110: icmp_seq=173 ttl=255 time=25.2 ms
64 bytes from 192.168.110.110: icmp_seq=174 ttl=255 time=48.6 ms
64 bytes from 192.168.110.110: icmp_seq=175 ttl=255 time=73.0 ms
64 bytes from 192.168.110.110: icmp_seq=176 ttl=255 time=3.95 ms
64 bytes from 192.168.110.110: icmp_seq=177 ttl=255 time=14.5 ms
64 bytes from 192.168.110.110: icmp_seq=178 ttl=255 time=47.9 ms

hostapd_wpa2.conf配置文件

interface=muap0
driver=nl80211
#ctrl_interface=/var/run/hostapd
ssid=caeri_gvobu_123

# RF
hw_mode=g
channel=1
country_code=CN

# 11N
ieee80211n=1
#ht_capab=[HT40+][SHORT-GI-20][SHORT-GI-40]

# 11AC
#ieee80211ac=1
#vht_capab=[SHORT-GI-80]
#vht_oper_chwidth=1
#vht_oper_centr_freq_seg0_idx=42

#no ax
# Security
ieee80211w=1
wpa=2/1
wpa_passphrase=caeri12345678
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP/CCMP
rsn_pairwise=CCMP

W131 WPA2测试

64 bytes from 192.168.110.5: icmp_seq=30 ttl=255 time=174 ms
64 bytes from 192.168.110.5: icmp_seq=31 ttl=255 time=93.2 ms
64 bytes from 192.168.110.5: icmp_seq=32 ttl=255 time=17.8 ms
64 bytes from 192.168.110.5: icmp_seq=33 ttl=255 time=661 ms
64 bytes from 192.168.110.5: icmp_seq=34 ttl=255 time=1094 ms
64 bytes from 192.168.110.5: icmp_seq=35 ttl=255 time=66.6 ms
64 bytes from 192.168.110.5: icmp_seq=36 ttl=255 time=599 ms
64 bytes from 192.168.110.5: icmp_seq=37 ttl=255 time=1028 ms
64 bytes from 192.168.110.5: icmp_seq=38 ttl=255 time=117 ms
64 bytes from 192.168.110.5: icmp_seq=39 ttl=255 time=452 ms
64 bytes from 192.168.110.5: icmp_seq=40 ttl=255 time=82.0 ms
64 bytes from 192.168.110.5: icmp_seq=41 ttl=255 time=1112 ms
64 bytes from 192.168.110.5: icmp_seq=42 ttl=255 time=493 ms
64 bytes from 192.168.110.5: icmp_seq=43 ttl=255 time=113 ms
64 bytes from 192.168.110.5: icmp_seq=44 ttl=255 time=982 ms
64 bytes from 192.168.110.5: icmp_seq=45 ttl=255 time=44.1 ms
64 bytes from 192.168.110.5: icmp_seq=46 ttl=255 time=986 ms
64 bytes from 192.168.110.5: icmp_seq=47 ttl=255 time=302 ms
64 bytes from 192.168.110.5: icmp_seq=48 ttl=255 time=21.7 ms

w131配置文件：

wifimode=ap
bss=caeri_gvobu_6209C380F662
passwd=caeri12345678

if [ "$wifimode" == "ap" ];then
    echo "start to setup access point."
    cd /lib/modules/wibt
    lsmod | grep "sd8xxx" > /dev/null 2>&1
    if [ $? -ne 0 ];then
        echo "do install module sd8787."
        insmod mlan.ko
        insmod sd8787.ko cfg80211_wext=0xf
        #sleep 1
    else
        echo "module sd8787 had installed."
    fi
    cd /opt/ella-w131/bin_sd8787
    ./uaputl.exe sys_cfg_ssid "$bss"
    # set AP SSID to "ELLA-W1"
    # set AP primary channel to 36 (5GHz band), with secondary channel above:
    ./uaputl.exe sys_cfg_channel 6
    # enable 802.11n mode with short guard interval, 40MHz channel bandwidth:
    ./uaputl.exe sys_cfg_11n 1 0x116e 3 0 0xff
    #./uaputl.exe sys_cfg_rates 0xc 0x12 0x18 0x24 0x30 0x48 0x60 0x6c
    ./uaputl.exe sys_cfg_80211d state 1 country CN
    # enable 802.11d, set country
    # configure encryption:
    ./uaputl.exe sys_cfg_auth 0
    ./uaputl.exe sys_cfg_protocol 32
    # WPA2
    ./uaputl.exe sys_cfg_wpa_passphrase "$password"
    # passphrase "topsecret"
    ./uaputl.exe sys_cfg_cipher 8 8
    # CCMP
    ./uaputl.exe bss_start
    # start the AP
    #sleep 1
    ifconfig uap0 192.168.110.1
    #share internet form 5G
    echo 1 > /proc/sys/net/ipv4/ip_forward
    cd /home/root/
fi

总结1

        hud设备型号：ESP32-C3-MINI-1，属于wifi4，支持802.11b/g/n。只有W263 WPA1延时正常，难道真的与加密方式有关系吗？使用W131 wifi4延时也很大，不是兼容性的问题吗？

        后面用W374 WP2测试

跑caeri_hud显示程序

64 bytes from 192.168.110.110: icmp_seq=48 ttl=255 time=47.4 ms
64 bytes from 192.168.110.110: icmp_seq=49 ttl=255 time=478 ms
64 bytes from 192.168.110.110: icmp_seq=50 ttl=255 time=501 ms
64 bytes from 192.168.110.110: icmp_seq=51 ttl=255 time=12.6 ms
64 bytes from 192.168.110.110: icmp_seq=52 ttl=255 time=444 ms
64 bytes from 192.168.110.110: icmp_seq=53 ttl=255 time=153 ms
64 bytes from 192.168.110.110: icmp_seq=54 ttl=255 time=490 ms
64 bytes from 192.168.110.110: icmp_seq=55 ttl=255 time=104 ms
64 bytes from 192.168.110.110: icmp_seq=56 ttl=255 time=126 ms
64 bytes from 192.168.110.110: icmp_seq=57 ttl=255 time=44.8 ms
64 bytes from 192.168.110.110: icmp_seq=58 ttl=255 time=478 ms
64 bytes from 192.168.110.110: icmp_seq=59 ttl=255 time=501 ms
64 bytes from 192.168.110.110: icmp_seq=60 ttl=255 time=215 ms
64 bytes from 192.168.110.110: icmp_seq=61 ttl=255 time=445 ms
64 bytes from 192.168.110.110: icmp_seq=62 ttl=255 time=468 ms
64 bytes from 192.168.110.110: icmp_seq=63 ttl=255 time=490 ms
64 bytes from 192.168.110.110: icmp_seq=64 ttl=255 time=515 ms
64 bytes from 192.168.110.110: icmp_seq=65 ttl=255 time=434 ms
64 bytes from 192.168.110.110: icmp_seq=66 ttl=255 time=456 ms
64 bytes from 192.168.110.110: icmp_seq=67 ttl=255 time=992 ms
64 bytes from 192.168.110.110: icmp_seq=68 ttl=255 time=505 ms
64 bytes from 192.168.110.110: icmp_seq=69 ttl=255 time=425 ms
64 bytes from 192.168.110.110: icmp_seq=70 ttl=255 time=448 ms
64 bytes from 192.168.110.110: icmp_seq=71 ttl=255 time=1015 ms
64 bytes from 192.168.110.110: icmp_seq=72 ttl=255 time=17.1 ms
64 bytes from 192.168.110.110: icmp_seq=73 ttl=255 time=14.7 ms
64 bytes from 192.168.110.110: icmp_seq=74 ttl=255 time=437 ms
64 bytes from 192.168.110.110: icmp_seq=75 ttl=255 time=264 ms
64 bytes from 192.168.110.110: icmp_seq=76 ttl=255 time=83.2 ms
64 bytes from 192.168.110.110: icmp_seq=77 ttl=255 time=506 ms
64 bytes from 192.168.110.110: icmp_seq=78 ttl=255 time=426 ms
64 bytes from 192.168.110.110: icmp_seq=79 ttl=255 time=450 ms
64 bytes from 192.168.110.110: icmp_seq=80 ttl=255 time=984 ms
64 bytes from 192.168.110.110: icmp_seq=81 ttl=255 time=495 ms

IMX8+openwrt+W131+WPA2+hostapd2.9【延时正常】

root@OpenWrt:/# cat /etc/hostapd.conf 
interface=uap0
driver=nl80211
ssid=caeri_gvobu_123
channel=1
wpa=2
wpa_key_mgmt=WPA-PSK
wpa_pairwise=CCMP
wpa_passphrase=caeri12345678

root@OpenWrt:/# cat /etc/init.d/wifi
#!/bin/sh /etc/rc.common

START=81

echo "wifi..."
boot() {
	echo "wifi boot..."
	insmod /lib/modules/4.14.98/mlan.ko
	insmod /lib/modules/4.14.98/sd8xxx.ko cfg80211_wext=0xf
	hostapd /etc/hostapd.conf &
	ifconfig uap0 192.168.0.1
	mkdir -p /var/lib/misc/
	touch /var/lib/misc/udhcpd.leases
	udhcpd -fS /etc/udhcpd.conf &
}

start() {
	echo "wifi start..."
}

hostapd: unrecognized option: V
hostapd v2.9

64 bytes from 192.168.110.110: seq=200 ttl=255 time=8.349 ms
64 bytes from 192.168.110.110: seq=201 ttl=255 time=37.871 ms
64 bytes from 192.168.110.110: seq=202 ttl=255 time=61.619 ms
64 bytes from 192.168.110.110: seq=203 ttl=255 time=85.293 ms
64 bytes from 192.168.110.110: seq=204 ttl=255 time=2.107 ms
64 bytes from 192.168.110.110: seq=205 ttl=255 time=30.331 ms
64 bytes from 192.168.110.110: seq=206 ttl=255 time=53.927 ms
64 bytes from 192.168.110.110: seq=207 ttl=255 time=77.996 ms
64 bytes from 192.168.110.110: seq=208 ttl=255 time=102.005 ms
64 bytes from 192.168.110.110: seq=209 ttl=255 time=23.235 ms
64 bytes from 192.168.110.110: seq=210 ttl=255 time=41.423 ms
64 bytes from 192.168.110.110: seq=211 ttl=255 time=72.328 ms
64 bytes from 192.168.110.110: seq=212 ttl=255 time=94.568 ms
64 bytes from 192.168.110.110: seq=213 ttl=255 time=10.357 ms
64 bytes from 192.168.110.110: seq=214 ttl=255 time=57.020 ms
64 bytes from 192.168.110.110: seq=215 ttl=255 time=63.699 ms
64 bytes from 192.168.110.110: seq=216 ttl=255 time=5.220 ms
64 bytes from 192.168.110.110: seq=217 ttl=255 time=2.666 ms
64 bytes from 192.168.110.110: seq=218 ttl=255 time=32.429 ms
64 bytes from 192.168.110.110: seq=219 ttl=255 time=56.548 ms
64 bytes from 192.168.110.110: seq=220 ttl=255 time=80.175 ms
64 bytes from 192.168.110.110: seq=221 ttl=255 time=105.807 ms
64 bytes from 192.168.110.110: seq=222 ttl=255 time=20.491 ms
64 bytes from 192.168.110.110: seq=223 ttl=255 time=49.922 ms
64 bytes from 192.168.110.110: seq=224 ttl=255 time=73.709 ms
64 bytes from 192.168.110.110: seq=225 ttl=255 time=97.923 ms
64 bytes from 192.168.110.110: seq=226 ttl=255 time=19.080 ms
64 bytes from 192.168.110.110: seq=227 ttl=255 time=43.357 ms
64 bytes from 192.168.110.110: seq=228 ttl=255 time=1.737 ms
64 bytes from 192.168.110.110: seq=229 ttl=255 time=95.259 ms
64 bytes from 192.168.110.110: seq=230 ttl=255 time=5.612 ms
64 bytes from 192.168.110.110: seq=231 ttl=255 time=39.541 ms
64 bytes from 192.168.110.110: seq=232 ttl=255 time=59.484 ms
64 bytes from 192.168.110.110: seq=233 ttl=255 time=83.280 ms
64 bytes from 192.168.110.110: seq=234 ttl=255 time=2.901 ms
64 bytes from 192.168.110.110: seq=235 ttl=255 time=30.612 ms
64 bytes from 192.168.110.110: seq=236 ttl=255 time=52.352 ms

对比两个W131配置

        发现两个W131配置有差异，openwrt系统配置简单只使用了默认是11b，而yocto的W131使用11b/g/n，只有wifi制式协议有差异。

注释掉hw_mode=g，ieee80211n=1，ieee80211w=1，其他保持原来不变

        这样连接在11b制式上面，链接速度11Mbps，这样延时使用几十ms最多在100多ms，解决了大延时问题，空口打流UDP 4Mb不丢包，TCP 7Mb。

总结2

        hud设备虽然支持11b/g/n制式，但在g和n制式上面由于MCU算力较弱导致延时较大，数据STA设备自身问题，设置11b制式解决延时大问题。

测速分析流程

测试总结：
1、HUD连接不稳定，WPA1和WPA2都能连接，WPA1一样的吗【一样的无改善】注释软件随机数【一样的无改善】
	#ieee80211w=1注释无改善
2、ping间隔越短越不容易出现大延迟，0.1=500~700ms 
3、正常ping时，出现大延迟后会掉线，掉线后能正几十ms延时
4、掉线频率1分钟一次
5、IMX6 263情况如何？W263一样的，1分钟掉线，又频繁的1s延时；使用WPA1测试【1分钟掉线，最大210ms】。不掉线，WPA1几十，WPA2 300多
6、IMX8 131呢？【确定是W131，是W131，不是hostapd方式】与W263一样的，1分钟掉线，又频繁的1s延时；
7、换固件：https://github.com/nxp-imx/imx-firmware/tree/lf-6.1.36_2.1.0/nxp/FwImage_9098_SD
	sdiouart9098_combo_v1.bin【固件与现在使用的一致】
		https://github.com/nxp-imx/imx-firmware/blob/lf-6.1.36_2.1.0/nxp/FwImage_9098_SD/sdiouart9098_combo_v1.bin
	切分支：git checkout lf-6.1.36_2.1.0
	nxp/FwImage_9098_SD/sdiouart9098_combo_v1.bin 【无改善】
	126c6ae89b47d5676baf01b30bddeb87  nxp/FwImage_9098_SD/sdiouart9098_combo_v1.bin
8、抓空中包【笔记本Ubuntu失败，不支持监听模式；使用MAC电脑抓】
9、跑程序后没有1分钟断开：/data/upgrade# ./caeri_hud 6000 &【WPA2和WPA1一致，无改善，大延时概率减低，平均400ms，但客户测试无改善】
10、注释国家码【无改善】
	315532813.891153: Previous country code 00, new country code CN 
	315535090.338067: nl80211: Regulatory information - country=00
11、ping Ubuntu系统，Ubuntu系统扫描ap时延时3秒多，不扫描平均55，最大348
12、hostapd 2.9改为v2.10【无改善】再改为WPA1【无改善】，muap0改为uap0【无改善】
13、wpa2注释wpa_pairwise=TKIP【无改善】，wpa2 CCMP【无改善】
14、WPA2【有信号但hud不能连上】
	wpa_pairwise=TKIP CCMP
	rsn_pairwise=CCMP TKIP
15、WPA1【貌似有改善，到几十ms，后面多测还是在几百ms】
	wpa_pairwise=TKIP CCMP
	rsn_pairwise=CCMP TKIP
16、去掉host_mlme=1参数 WPA1【刚开始几十ms，后面400ms】WPA2【无改善】
17、连工ESP32+W131 使用JWD2是正常的；连工ESP32+W131 使用JWD3是正常的；
18、IMX8+openwrt+W131+WPA2+hostapd2.9【平均几十ms，最大100多】
	round-trip min/avg/max = 1.736/46.872/162.813 ms
	round-trip min/avg/max = 1.875/20.000/65.269 ms
19、注释g/n协议，默认在11b上面【延时正常几十ms】
	802.11b制式，链接速度：11Mbps，打流UDP 4Mb不丢包，TCP 07Mb
	802.11g制式，链接速度：54Mbps，打流UDP 4Mb不丢包，TCP 25Mb