• It seems that applications are very sensitive to network errors, especially on the player side, and our wifi seems that hurts it a lot. I wonder if this issue is happening to someone else or maybe ...
• Latency-Based WiFi Congestion Control in the Air for Dense WiFi Networks
• ve observed that Nagstamon causes high latency about once every 10-20 seconds on WiFi on Mac OS X. We've observed this behavior under the following conditions: <ul><li>On both High Sierra and ...
• <div><p>I am currently using the publisher subscriber API when sending data readings over Wifi. I send my readings at 10 ms intervals. The mean latency is 2 ms which is acceptable for my application. ...
• <div><p>we use rpi for voip and pbx and everything works fine except if we use the builtin wifi, then for some reason ping latency increases even on LAN and its more erratic when there is a voip call ...
• <div><p>I just resolved an extremely odd issue on my MacBook Pro - I had random latency spikes from about 1ms to 600ms every few seconds. I did the usual - reboot WLAN AP's etc. but nothing helped...
• Similar behaviour whether using wifi (5G) or USB. Everything works fine, but right now I'm trying to get a consistent latency. <p>Initial connection mostly seems to work fine, with minimal ...
• https://lostdomain.org/2017/06/17/qt-qnetworkaccessmanager-causing-latency-spikes-on-wifi/ https://bugreports.qt.io/browse/QTBUG-40332 https://bugreports.qt.io/browse/QTBUG-65586</p><p>该提问来源于...
• <div><p>HI Josh, it ... What is the latency between the camera switching (disconnect/connect to a new wifi network)? <p>Thanks!</p><p>该提问来源于开源项目：joshvillbrandt/GoProController</p></div>
• When I enable microphone streaming after a few minutes transport and decode latency increases and it becomes unplayable (see the pic.). My PC is connected with ethernet cable and I share wifi with a ...
• <strong>I did my project with official Micropython but I had trouble with Wifi (STA mode and socket server), it could not work after AP turned off then turned on. But your firmware is pretty good ...
• ve went through the installation of ALVR 2.4.0 alpha4 but when I connect to a server I got a very high latency. <p>My PC is connected to the router with an ethernet cable. My Oculus Quest is connected...
• m aware that network latency may be an issue, but I have the TV connected via ethernet and the ESP01 via WiFi right next to the router. Previously I was using a Dreamscreen device which also has a UDP...
• Does the transport latency include all Wifi latency, or is that where the missing lag is coming from? <p>If I switch to a really low 25% resolution, then the encode/transport/decode latencies only ...
• m having problems with DS4 because I am getting really bad controller latency over both WiFi and bluetooth. PC is on ultimate performance mode and no power saving on the bluetooth or the USB hub is ...
• <p>The tab is directly connected to the host-pc via wifi (the host provides a hotspot) 2,4GHz full signal <p>Is there something other I could try to get a better latency?</p><p>该提问来源于开源项目&#...
• <p>The audio is sent via pulseaudio to /tmp/snapfile and streamed via Wifi to the client. <p>Is this the default latency? Are there any knobs to tune for latency? May a more recent version reduce the ...
• WLAN 1 from https://www.metageek.com/training/resources/zigbee-wifi-coexistence.html ) <p>If needed/wanted I can send one of the repeaters to any european address if someone wants to debug it. (free ...
• <div><p>Hi Moode team, <p>I often use Moode with the Bluetooth renderer, paired with my ...- Wifi & Bluetooth dongles - USB audio output</p><p>该提问来源于开源项目：moode-player/moode</p></div>
• <div><p>I used a radio station and tested a crazyflie. There is a problem ... There are no interfering devices such as WiFi in my room.</p><p>该提问来源于开源项目：USC-ACTLab/crazyswarm</p></div>
• My printer has a very responsive and usable UI (1.22.6) when I’m connected locally on my network (over WiFi). But, if I connect over the internet I receive frequent disconnects due to timeout errors...
• <p>Pipeline latency difference for the https://github.com/jacobperron/pc_pipe demo that triggered the issue (measured on an Ubuntu 20.04 VM under macOS, using Foxy and with a fix in place to use ...
• 由于最新的Windows 8对于WiFi 传输有Latency的要求，最近一直在忙这件事。 MS要求Peer到Peer之间的Lantency要小于几十个毫秒吧。这段时间可以划分为一下这几个部分： APP-->Driver--（Air）-->Driver in Rx ...

由于最新的Windows 8对于WiFi 传输有Latency的要求，最近一直在忙这件事。
MS要求Peer到Peer之间的Lantency要小于几十个毫秒吧。这段时间可以划分为一下这几个部分：
APP-->Driver--（Air）-->Driver in Rx side-->APP in Rx side。
因为用的是UDP，理论上应该没有window,sequence number这种概念，OS只要收到一个数据包就应该通知APP。
根据Driver的现状一开始以为可能跟下面这些因素有关：
1.Resource,因为Driver Pre-allocated的一些memory有可能会不够。
2.Disorder,Driver发送IP layer的数据包，有时候存在乱序。
但是Debug,fix了1,2这两个问题，latency还是很大，有几十ms.
终于在下班前想到一点，就是APP本身的问题，APP是一个同事写的，下面简单描述下Rx端的伪代码:

config socket...for(;;){

WSARecvFrom(socket,...);
...
Do something.
...
}

发现Latency其实就在于Do something花费了一段可观的时间。代码的逻辑导致APP需要逐个处理数据包，Do something需要花费大概2ms。也就是说1s最多能handle500个Packet，但是Driver有时在1s内会indicate将近800个Packet给OS。所以导致APP这边存在瓶颈，OS只有等APP处理玩当前数据包，才传下一个给APP。
BTW,介绍下Windows精确计时的方法:
UserMode: QueryPerformanceCounter()/QueryPerformanceFrequency();
KernelMode: KeQueryPerformanceCounter(&PerformanceFrequency);
用上面这几个函数就可以了，具体用法见MSDN。

转载于:https://www.cnblogs.com/zzSoftware/archive/2013/02/26/2934189.html
展开全文
• I choose a controller which support mobility to test the handover latency when a sta moving among APs , of course I use the mininet-wifi to simulate experimental environment. And I get a strange ...
• <p>I have a small esp8266 (wifi) running a simple sketch that emulates a PIR sensor as well as a switch. (code is attached below) <p>This is a proof of concept as to see what kind of latency I could ...
• <ul><li>AirConnect running on Raspberry Pi</li><li>Google Wifi mesh network</li><li>Sonos PLAY:1 (latest firmware as of Dec 22 2019)</li><li>Mac 10.14.6 (haven't tested other OS)</li><li>Note: ...
• <p>Similar issues were confirmed when streaming to a different laptop over ethernet (and again over wifi). <p>Given that the paper reports better than 300ms latency in figure 6d ("intermittent ...

...