[guardian-dev] Patches to improve mobile hidden service performance

[Michael Rogers]

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Hi all,

I've been experimenting with small changes to Tor to improve the
performance of mobile hidden services. Attached are patches for Tor
(https://git.torproject.org/tor.git, tor-0.2.24 tag) and jtorctl
(https://github.com/guardianproject/jtorctl.git, master branch) that
make two performance improvements:

1. Each time the network's enabled, don't try to build introduction
circuits until we've successfully built a circuit. This avoids a
problem where we'd try to build introduction circuits immediately, all
the circuits would fail, and we'd wait for 5 minutes before trying again.

2. Added a command to the control protocol to purge any cached state
relating to a specified hidden service. This command can be used
before trying to connect to the service to force Tor to download a
fresh descriptor.

I've only done small-scale testing of these patches so far. I'd be
interested to know whether they improve performance for your apps. If
they seem to be useful I'll submit them upstream.

Cheers,
Michael
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