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Raise guard threshold to top 25% or 2000 kilounits 

Authorities now assign the Guard flag to the fastest 25% of the
network (it used to be the fastest 50%). Also raise the consensus
weight that guarantees the Guard flag from 250 to 2000. For the
current network, this results in about 1100 guards, down from 2500.
This step paves the way for moving the number of entry guards
down to 1 (proposal 236) while still providing reasonable expected
performance for most users.

Implements ticket 12690.
This commit is contained in:
Roger Dingledine 2014-07-24 00:35:47 -04:00
parent a4c641cce9
commit a57c07b210
3 changed files with 13 additions and 3 deletions
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9
changes/ticket12690 Normal file
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@ -0,0 +1,9 @@
o Minor features:
- Authorities now assign the Guard flag to the fastest 25% of the
network (it used to be the fastest 50%). Also raise the consensus
weight that guarantees the Guard flag from 250 to 2000. For the
current network, this results in about 1100 guards, down from 2500.
This step paves the way for moving the number of entry guards
down to 1 (proposal 236) while still providing reasonable expected
performance for most users. Implements ticket 12690.

2
src/or/config.c
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@ -147,7 +147,7 @@ static config_var_t option_vars_[] = {
V(AuthDirInvalid, LINELIST, NULL),
V(AuthDirInvalidCCs, CSV, ""),
V(AuthDirFastGuarantee, MEMUNIT, "100 KB"),
V(AuthDirGuardBWGuarantee, MEMUNIT, "250 KB"),
V(AuthDirGuardBWGuarantee, MEMUNIT, "2 MB"),
V(AuthDirReject, LINELIST, NULL),
V(AuthDirRejectCCs, CSV, ""),
V(AuthDirRejectUnlisted, BOOL, "0"),

5
src/or/dirserv.c
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@ -1588,7 +1588,7 @@ dirserv_compute_performance_thresholds(routerlist_t *rl,
/* (Now bandwidths is sorted.) */
if (fast_bandwidth_kb < ROUTER_REQUIRED_MIN_BANDWIDTH/(2 * 1000))
fast_bandwidth_kb = bandwidths_kb[n_active/4];
guard_bandwidth_including_exits_kb = bandwidths_kb[(n_active-1)/2];
guard_bandwidth_including_exits_kb = bandwidths_kb[n_active*3/4];
guard_tk = find_nth_long(tks, n_active, n_active/8);
}
@ -1646,7 +1646,8 @@ dirserv_compute_performance_thresholds(routerlist_t *rl,
if (n_active_nonexit) {
guard_bandwidth_excluding_exits_kb =
median_uint32(bandwidths_excluding_exits_kb, n_active_nonexit);
find_nth_uint32(bandwidths_excluding_exits_kb,
n_active_nonexit, n_active_nonexit*3/4);
}
log_info(LD_DIRSERV,