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udisksctl

$ time udisksctl loop-setup -f Windows.iso                                       
Mapped file Windows.iso as /dev/loop0.

real    3m0.784s
user    0m0.015s
sys     0m0.010s

losetup

# time losetup -f Windows.iso

real    0m0.009s
user    0m0.001s
sys     0m0.004s

I need to use udisksctl because no root is required for it. However, my gripe with it is that compared to losetup it's extremely slow. I do want to note however that udisksctl rarely mounts it straight away like losetup does; however I don't know why. The mount command with the -o loop option is also very fast like losetup.

I did an strace on the udisksctl and it seems to be spending pretty much all that time on polling as I would have guessed based on the time measurement.

poll([{fd=8, events=POLLIN}], 1, -1)    = 1 ([{fd=8, revents=POLLIN}])
read(8, "\1\0\0\0\0\0\0\0", 16)         = 8
poll([{fd=8, events=POLLIN}], 1, -1

Is there anyway I can speed it up or at least some other non-root tool I can use? Also, are other people experiencing similar results?

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