Uwatec Smart Z data download takes 1.5 hours for only 4 dives

Sape Sikkema s.sikkema at telfort.nl
Sat Dec 28 05:51:47 UTC 2013

Dear development team,

Thanks for your relentless efforts to solve my problem. If I understand 
correctly there are two issues:

1. Subsurface always downloads all dives from the Uwatec Smart Z device 
because of the fact Subsurface does not use the fingerprint feature.
2. Some drivers / kernels have an effect on the transfer speed.

On Jef's request I did some test with different linux kernels and 
different hardware to download all 102 dives from the device using both 
SmartTrak and the libdivecomputer universal application. Here are the 

Desktop Pentium 4 2.8 GHz, 2 GB RAM:

1: Universal, OpenSuse 13.1 kernel 3.11.6-4-default:     77 mins
2: Universal, Xubuntu 12.04 kernel 3.2.0-52-generic (live-CD): 18 mins
3: SmartTrak, OpenSuse 13.1 kernel 3.11.6-4-default + Wine:       80 mins
4: SmartTrak, Windows XP:                   13 mins
5: Universal, Windows XP:                     12 mins

Netbook Acer Aspire One ZG5, 1 GB RAM:

4: Universal, Ubuntu 12.04 kernel 3.2.0-57-generic:     18 mins
6: Universal, OpenSuse 13.1 kernel 3.11.6-4-default (live CD): 80 mins

Hope this helps you to find the root cause of the slow data 
transmission. Let me know if I can do more.

Best Regards,


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