Nicholas Hopper hopper@cs.umn.edu writes:
On Tue, Feb 25, 2014 at 5:04 PM, Nicholas Hopper hopper@cs.umn.edu wrote:
Another thought: we also should investigate how various thresholds affect the relationship between the cumulative guard weight total and the total exit weight.
Well, that turns out not to be a real issue: even if we set the guard threshold to 20MBps, the total guard weight still exceeds the total exit weight.
Here is a chart showing what fraction of total guard bandwidth is retained as we vary the guard threshold from 0 to 10MBps:
https://www-users.cs.umn.edu/~hopper/guards/guard_thresholds_bandwidth.png
And here's a chart showing what fraction of clients will choose the highest (max%) and median (median%) guards as we vary the threshold over the same range:
https://www-users.cs.umn.edu/~hopper/guards/guard_thresholds_weight.png
2MBps and 6MBps look like interesting points on the curves.
Thanks, these are useful graphs.
And here is another one with the number of guard nodes over different cutoff values:
https://people.torproject.org/~asn/guards/guard_number_cutoff.png
We will want to choose a cutoff value that doesn't discard too many guard nodes.