[Interest] Running FancyBrowser / QtWebKit example causes periodical wifi network delay & VOIP interruption, Qt 5.3.2, Windows 7 x64

[Andre Barth]

Hi Allan,



thanks for the prompt reply.



>>> QtWebKit/fancybrowser doesn't do anything on it own, only when instructed by the user or web-site is any traffic initiated.

Understood - it must/could be the QWebView that the example is using.

But even starting the browser with no URL (i.e. not the default <http://www.qt-project.org>) is showing that issue (presumably wifi only)



Reply from: bytes=32 time=1ms TTL=127

Reply from: bytes=32 time=1ms TTL=127

Reply from: bytes=32 time=1ms TTL=127

Reply from: bytes=32 time<1ms TTL=127

->Reply from: bytes=32 time=74ms TTL=127

->Reply from: bytes=32 time=18ms TTL=127

->Reply from: bytes=32 time=12ms TTL=127

Reply from: bytes=32 time<1ms TTL=127

Reply from: bytes=32 time=82ms TTL=127

Reply from: bytes=32 time=76ms TTL=127

Reply from: bytes=32 time=1ms TTL=127

Reply from: bytes=32 time=1ms TTL=127

Reply from: bytes=32 time=1ms TTL=127

Reply from: bytes=32 time=2ms TTL=127

Reply from: bytes=32 time=1ms TTL=127

->Reply from: bytes=32 time=115ms TTL=127

->Reply from: bytes=32 time=109ms TTL=127

->Reply from: bytes=32 time=52ms TTL=127



and so on...



>>> Start by logging the network traffic and see what it is

I've done that already but I didn't spot anything obvious. Will have to go back, I guess ;-)



I'm not the network expert, obviously, but could it be that Qt somewhere queries the network stack / driver /adapter or whatever which causes the IO to hang, i.e. no traffic is actually sent / received at all by the Qt app? But that periodic check or query just causes the adapter to delay the network IO? Maybe somewhere in the QNetworkManager(Engine/Service) classes?



Thanks,

Andre



-----Original Message-----
From: Allan Sandfeld Jensen [mailto:carewolf at gmail.com] On Behalf Of Allan Sandfeld Jensen
Sent: Thursday, January 29, 2015 12:43 AM
To: interest at qt-project.org
Cc: Andre Barth
Subject: Re: [Interest] Running FancyBrowser / QtWebKit example causes periodical wifi network delay & VOIP interruption, Qt 5.3.2, Windows 7 x64



On Wednesday 28 January 2015, Andre Barth wrote:

> Hi all,

>

> When running the Fancybrowser example from the Qt 5.3.2 SDK I'm

> experiencing a periodical delay in transmitting network data over my

> wifi connection.

>

> Doing a parallel [ping -t] to another machine inside the same

> subnetwork shows a spike-like increase of the ping time every 5

> seconds or so. We cannot use voip / lync whilst the Qt-application is

> running due to the constant break-up of the data transmission.

>

> Any ideas which area in the Webkit(?) code base might be causing that

> and/or where to best start looking?

>

Start by logging the network traffic and see what it is. Also if you believe it is QtWebKit you should check what website causes it. QtWebKit/fancybrowser doesn't do anything on it own, only when instructed by the user or web-site is any traffic initiated.



Best regards

`Allan
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.qt-project.org/pipermail/interest/attachments/20150129/5000ec79/attachment.html>