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

Linus Torvalds torvalds at linux-foundation.org
Mon Dec 30 14:25:54 UTC 2013

On Sat, Dec 28, 2013 at 10:03 AM, Linus Torvalds
<torvalds at linux-foundation.org> wrote:
> I'll see if I can find anything. I need a device that does bulk irda
> transfers too, if course. I'll be back home on Monday and try to find
> something at Fry's...

Ugh. IrDA is so uncommon that even the local Fry's didn't have it. Or
rather, they had exactly one IrDA adapter, but for testing I really
wanted two (so that I could just make two USB ports talk to each

I found some on Amazon, though, for delivery tomorrow. I should have
done that to begin with. Hopefully I can at least try to debug any
kernel issue.

Sape, mind strace'ing a slow download using the libdivecomputer
"universal" app with the "-Ttt" flags. So something like

    strace -o trace-file -Ttt ./universal ..flags-go-here..

and you don't actuall yneed to wait the full 80 minutes, just let it
run for a minute or so, and then ^C it and send me the resulting

That way I see the IO patterns for when I try to recreate it without
an actual dive computer.


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