Performance while overlaping windows on windows taskbar

Lior

Hi,
I have a small app that recive udp packets and show the data on sevarl forms.

I VERIFIED that the thread is running on different thread.

I have performance issui that i cant explain.

Im opening 3 ui form that do nothing.
Im reciving the udp data and do nothing with the data.
I printing the frame number that is send in data structure.
I calaculte the diff between the frame numbers(should be one becuase it integer that incremant every cycle).

When i open the app, every thing is ok.

the problem
**when the forms is minimized, and i go to the taskbar, i put the mouse cursor on the app icon.
The forms is shown as small windows and i can move across the forms to choose one of the forms.
When i do this, i loose lots of Udp packets
Why? **

SGaist

Hi,

Which version of Qt are you using ?
On which version of Windows ?

Lior

@SGaist
I tried 4.8 and 5.12.
Windows 7.
Both the same result.

In additional to the post.
I see that when go over any minimized program on the taskbar i start lose packets.

Kent-Dorfman

just a WAG, but check the settings in your windoze task manager. In there somewhere is a setting to balance CPU load between background and foreground tasks. See if adjusting it makes a difference. For a well written UDP listener it shouldn't matter but I don't know what your UDP service code looks like.

Lior

@Kent-Dorfman
Its very simple app.
Controler thread.
Udp thread.

I implemnted the basics to verify if it work.
The Controler thread open udp thread,
In the udp thread i use QUdpsocket with connect to readyread().
The data arrive contunusly.

Currenylt the ui do nothing, the Controler do nothing.

When i will be infront of computer i will add the basic code.

All the thread is opend with moveToThread().

Lior

Hi,
@SGaist
@Kent-Dorfman

I tried to google "QUdpsocket priority",
I got many result that discribe my problem but without soultion.

Many peopele have the same problem.

My felling is there is some problem. But i dont have enough knowledge to debug it.