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

[Markus Franke]

Just in case anybody has the same problems one day. 

The mount option "-o usefree" for the USB stick device solves the problem.

Mit freundlichen Grüßen / Best regards

Markus Franke
Entwicklung/ Development

SebaKMT
Hagenuk KMT Kabelmesstechnik GmbH
Röderaue 41
01471 Radeburg / Germany
Reg.Gericht (01067 Dresden) HRB 12567
Geschäftsf.: Dr. Max Iann

Phone +49 (0)35208 84 29142
Fax      +49 (0)35208 84 29249

e-mail: franke.m at sebaKMT.com
web: http//www.sebaKMT.com

qt-interest-bounces at trolltech.com schrieb am 01.07.2009 16:28:21:

> 
> qt-interest-bounces at trolltech.com schrieb am 01.07.2009 16:05:05:
> 
> > (i) Use a usb 2.0 device, bus and driver if you have them available. 
> 
> The device is USB 2.0 compatible. However, so far we're using an USB 1.1 

> OHCI driver. 
> 
> > (ii) Use a larger block size with VFAT. Is there any reason you really 
must 
> > use a 4k block size? 
> 
> The USB sticks which we purchase are preformatted with 4 KByte cluster 
> size. Maybe we should switch over to a different vendor. 
> 
> > (iii) Use a different file system. There are many alternatives to 
choose from 
> > but it depends upon your project requirements. 
> 
> The USB stick's should be readable within a windows environment. VFAT is 

> the most suitable filesystem for this, isn't it? 
> 
> > (iv) Patch QDir::entryList() and QDir::count() so that they work as 
fast as ls 
> 
> Hmmm....sounds not so easy. ;-) 
> 
> > (if you are sure that ls is nto using cached results). 
> 
> I am sure. 
> 
> > (v) Improve the kernel's VFAT driver to work better with small block 
sizes 
> > over usb 1.1.
> 
> Isn't better than the last option. ;-) 
> 
> Anyway. Thanks for your help and patience. 
> 
> Mit freundlichen Grüßen / Best regards
> 
> Markus Franke
> Entwicklung/ Development
> 
> SebaKMT
> Hagenuk KMT Kabelmesstechnik GmbH
> Röderaue 41
> 01471 Radeburg / Germany
> Reg.Gericht (01067 Dresden) HRB 12567
> Geschäftsf.: Dr. Max Iann
> 
> Phone +49 (0)35208 84 29142
> Fax      +49 (0)35208 84 29249
> 
> e-mail: franke.m at sebaKMT.com
> web: 
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