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Compute latency-smoothed maximum rate

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Signed-off-by: Adrien Gallouët <adrien@gallouet.fr>
This commit is contained in:
Adrien Gallouët
2018-04-21 12:25:52 +00:00
parent a7044db87c
commit b2e4bc1b8f
2 changed files with 29 additions and 2 deletions
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27
mud.c
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@@ -146,6 +146,7 @@ struct mud_packet {
} conf;
struct {
unsigned char rate[MUD_U48_SIZE];
unsigned char ratemax[MUD_U48_SIZE];
unsigned char rms[MUD_U48_SIZE];
unsigned char rmt[MUD_U48_SIZE];
} stat;
@@ -1100,6 +1101,7 @@ mud_packet_send(struct mud *mud, struct mud_path *path,
mud_write48(packet->data.stat.rms, path->recv_max);
mud_write48(packet->data.stat.rmt, path->recv_max_time);
mud_write48(packet->data.stat.rate, path->recv.rate);
mud_write48(packet->data.stat.ratemax, path->recv.ratemax);
break;
case mud_fake:
size = path->mtu.probe - MUD_PACKET_SIZE(0);
@@ -1258,6 +1260,7 @@ mud_packet_recv(struct mud *mud, struct mud_path *path,
path->r_rms = mud_read48(packet->data.stat.rms);
path->r_rmt = mud_read48(packet->data.stat.rmt);
path->r_rate = mud_read48(packet->data.stat.rate);
path->r_ratemax = mud_read48(packet->data.stat.ratemax);
if (path->mtu.ok < path->r_rms)
path->mtu.ok = path->r_rms;
break;
@@ -1353,9 +1356,29 @@ mud_recv(struct mud *mud, void *data, size_t size)
if (MUD_PACKET(send_time)) {
mud_packet_recv(mud, path, now, send_time, packet, packet_size);
} else if (mud_timeout(now, path->stat_time, MUD_STAT_TIMEOUT)) {
path->recv.rate = MUD_ONE_SEC * path->recv.bytes / MUD_TIME_MASK(now - path->stat_time);
mud_packet_send(mud, path, now, send_time, mud_stat);
const uint64_t rate = MUD_ONE_SEC * path->recv.bytes / MUD_TIME_MASK(now - path->stat_time);
const uint64_t lat = MUD_TIME_MASK(now - send_time + mud->time_tolerance);
if (path->recv.ratemax < rate)
path->recv.ratemax = rate;
if (path->latmin > lat || !path->latmin)
path->latmin = lat;
if (path->latmax < lat)
path->latmax = lat;
if (path->recv.ratemax > rate) {
const uint64_t range = path->latmax - path->latmin;
if (range && lat > path->latmin + (range >> 1))
path->recv.ratemax = ((lat - path->latmin) * rate +
(path->latmax - lat) * path->recv.ratemax) / range;
}
path->recv.rate = rate;
path->recv.bytes = 0;
mud_packet_send(mud, path, now, send_time, mud_stat);
path->stat_time = now;
}