我们最近升级了我们的互联网提供商，现在配备 2.4Ghz 和 5Ghz wifi。我可以在 2.4Ghz 上正确连接，而在 5Ghz 上我会遇到连接中的随机“滞后”。更具体地说，网络管理器不会断开与路由器的连接，但在出现延迟时刷新浏览器中的页面需要 7-30 秒。有时 ssh 连接也会断开。这种情况以随机方式发生，但通常每 3-5 分钟发生一次。我尝试更改 5Ghz 频道，但没有成功。房子里的其他设备没有遇到任何问题。
我已经尝试过从向后移植重新安装 Intel 3160 驱动器以及重新安装 linux 映像，但没有成功。我还禁用了 wifi.powersave 到 wlan0 但没有运气。
有谁知道如何解决或调试这个问题？
这些是一些系统信息：
名称-a：
Linux debian 4.9.0-8-amd64 #1 SMP Debian 4.9.110-3+deb9u5 (2018-09-30) x86_64 GNU/Linux (Debian stretch)
lshw -C 网络：
*-network
description: Wireless interface
product: Wireless 3160
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:03:00.0
logical name: wlan0
version: 93
serial: 34:e6:ad:be:63:65
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=4.9.0-8-amd64 firmware=17.948900127.0 ip=192.168.0.17 latency=0 link=yes multicast=yes wireless=IEEE 802.11
resources: irq:49 memory:c1000000-c1001fff
iw配置：
wlan0 IEEE 802.11 ESSID:"BRA****"
Mode:Managed Frequency:5.56 GHz Access Point: F8:AB:05:00:1E:DE
Bit Rate=390 Mb/s Tx-Power=22 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality=62/70 Signal level=-48 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:125 Missed beacon:0
如果配置：
wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.0.17 netmask 255.255.255.0 broadcast 192.168.0.255
inet6 fe80::36e6:adff:febe:6365 prefixlen 64 scopeid 0x20<link>
inet6 2a02:8109:a3c0:55af:36e6:adff:febe:6365 prefixlen 64 scopeid 0x0<global>
ether 34:e6:ad:be:63:65 txqueuelen 1000 (Ethernet)
RX packets 415816 bytes 507186123 (483.6 MiB)
RX errors 0 dropped 2 overruns 0 frame 0
TX packets 144134 bytes 31353570 (29.9 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisi
lspci -k -nn | lspci -k -nn | grep -A 3 -i 网络：
03:00.0 Network controller [0280]: Intel Corporation Wireless 3160 [8086:08b4] (rev 93)
Subsystem: Intel Corporation Dual Band Wireless AC 3160 [8086:8270]
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi
modinfo iwlwifi：
filename: /lib/modules/4.9.0-8-amd64/kernel/drivers/net/wireless/intel/iwlwifi/iwlwifi.ko
license: GPL
author: Copyright(c) 2003- 2015 Intel Corporation <[email protected]>
description: Intel(R) Wireless WiFi driver for Linux
firmware: iwlwifi-100-5.ucode
firmware: iwlwifi-1000-5.ucode
firmware: iwlwifi-135-6.ucode
firmware: iwlwifi-105-6.ucode
firmware: iwlwifi-2030-6.ucode
firmware: iwlwifi-2000-6.ucode
firmware: iwlwifi-5150-2.ucode
firmware: iwlwifi-5000-5.ucode
firmware: iwlwifi-6000g2b-6.ucode
firmware: iwlwifi-6000g2a-6.ucode
firmware: iwlwifi-6050-5.ucode
firmware: iwlwifi-6000-4.ucode
firmware: iwlwifi-7265D-26.ucode
firmware: iwlwifi-7265-17.ucode
firmware: iwlwifi-3168-26.ucode
firmware: iwlwifi-3160-17.ucode
firmware: iwlwifi-7260-17.ucode
firmware: iwlwifi-8265-26.ucode
firmware: iwlwifi-8000C-26.ucode
firmware: iwlwifi-9000-pu-a0-lc-a0--26.ucode
firmware: iwlwifi-9260-th-a0-jf-a0--26.ucode
firmware: iwlwifi-9000-pu-a0-jf-a0--26.ucode
firmware: iwlwifi-Qu-a0-jf-b0--26.ucode
alias: pci:v00008086d00002720sv*sd00000A10bc*sc*i*
alias: pci:v00008086d0000A370sv*sd00001030bc*sc*i*
alias: pci:v00008086d00002526sv*sd00001030bc*sc*i*
alias: pci:v00008086d000031DCsv*sd00000030bc*sc*i*
[...]
depends: cfg80211
retpoline: Y
intree: Y
vermagic: 4.9.0-8-amd64 SMP mod_unload modversions
parm: swcrypto:using crypto in software (default 0 [hardware]) (int)
parm: 11n_disable:disable 11n functionality, bitmap: 1: full, 2: disable agg TX, 4: disable agg RX, 8 enable agg TX (uint)
parm: amsdu_size:amsdu size 0: 12K for multi Rx queue devices, 4K for other devices 1:4K 2:8K 3:12K (default 0) (int)
parm: fw_restart:restart firmware in case of error (default true) (bool)
parm: antenna_coupling:specify antenna coupling in dB (default: 0 dB) (int)
parm: nvm_file:NVM file name (charp)
parm: d0i3_disable:disable d0i3 functionality (default: Y) (bool)
parm: lar_disable:disable LAR functionality (default: N) (bool)
parm: uapsd_disable:disable U-APSD functionality bitmap 1: BSS 2: P2P Client (default: 3) (uint)
parm: bt_coex_active:enable wifi/bt co-exist (default: enable) (bool)
parm: led_mode:0=system default, 1=On(RF On)/Off(RF Off), 2=blinking, 3=Off (default: 0) (int)
parm: power_save:enable WiFi power management (default: disable) (bool)
parm: power_level:default power save level (range from 1 - 5, default: 1) (int)
parm: fw_monitor:firmware monitor - to debug FW (default: false - needs lots of memory) (bool)
parm: d0i3_timeout:Timeout to D0i3 entry when idle (ms) (uint)
parm: disable_11ac:Disable VHT capabilities (default: false) (bool)
答案1
问题似乎出在 wifi 适配器驱动程序上。我通过将内核升级到 stretch-backports 存储库中包含的最新版本（4.18）成功解决了该问题。
Apt 应该启用向后移植源
对于 Debian Stretch，在 /etc/apt/sources.list 中附加以下内容：
deb http://ftp.debian.org/debian stretch-backports main contrib non-free
deb-src http://ftp.debian.org/debian stretch-backports main contrib non-free
然后安装内核：
sudo apt update && sudo apt -t stretch-backports install linux-image-4.18.0-0.bpo.1-amd64 linux-headers-4.18.0-0.bpo.1-amd64
并重新启动以加载新内核。