[Qt-embedded-interest] Antwort: Re: [Qt-interest] long-term delay for QDir::entryList(), QDir::count() for directory located on USB stick

[Markus Franke]

qt-interest-bounces at trolltech.com schrieb am 01.07.2009 15:36:49:

> First off, have you isolated the problem to be in the linux kernel's 
driver or 
> the Qt code or your code?

Well, I thought I isolated the problem. If I plug-in the device, it get's 
properly recognized and mounted by my hotplugging script.

> You can test to see if it is a kernel level problem by simply doing an 
ls in 
> your usb stick's filesystem and timing that. If that takes a long time 
the 
> first time that you run it, then it is a kernel/filesystem/hw problem.

Strange. If I type an 'ls' command for the first time after plugging in 
the USB stick it is very fast. However, if I issue a 'df' command it's 
taking a very long time.

Seems like you were right and it is a kernel level problem. 

Although it doesn't belong to this list: Does anybody have a suggestion 
how to fix this problem?


Mit freundlichen Grüßen / Best regards

Markus Franke
Entwicklung/ Development

SebaKMT
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