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Retune BBRv3 Max for usable throughput

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This commit is contained in:
byjoey
2026-06-15 20:51:04 +08:00
parent 07c246922c
commit af2d3d678b
4 changed files with 33 additions and 33 deletions
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scripts/apply-bbrv3-max-profile.sh
+26 -26
View File
@@ -23,37 +23,37 @@ text = path.read_text()
replacements = {
r"static const u32 bbr_probe_rtt_win_ms = .*?;": "static const u32 bbr_probe_rtt_win_ms = 10000;",
r"static const u32 bbr_probe_rtt_cwnd_gain = .*?;": "static const u32 bbr_probe_rtt_cwnd_gain = BBR_UNIT * 2;",
r"static const u32 bbr_probe_rtt_cwnd_gain = .*?;": "static const u32 bbr_probe_rtt_cwnd_gain = BBR_UNIT;",
r"static const u32 bbr_probe_rtt_mode_ms = .*?;": "static const u32 bbr_probe_rtt_mode_ms = 10;",
r"static const u32 bbr_tso_rtt_shift = .*?;": "static const u32 bbr_tso_rtt_shift = 2;",
r"static const int bbr_pacing_margin_percent = .*?;": "static const int bbr_pacing_margin_percent = 0;",
r"static const int bbr_startup_pacing_gain = .*?;": "static const int bbr_startup_pacing_gain = BBR_UNIT * 4;",
r"static const int bbr_startup_cwnd_gain = .*?;": "static const int bbr_startup_cwnd_gain = BBR_UNIT * 4;",
r"static const int bbr_startup_pacing_gain = .*?;": "static const int bbr_startup_pacing_gain = BBR_UNIT * 3;",
r"static const int bbr_startup_cwnd_gain = .*?;": "static const int bbr_startup_cwnd_gain = BBR_UNIT * 5 / 2;",
r"static const int bbr_drain_gain = .*?;": "static const int bbr_drain_gain = BBR_UNIT / 2;",
r"static const int bbr_cwnd_gain = .*?;": "static const int bbr_cwnd_gain = BBR_UNIT * 4;",
r"static const int bbr_cwnd_gain = .*?;": "static const int bbr_cwnd_gain = BBR_UNIT * 5 / 2;",
r"static const u32 bbr_cwnd_min_target = .*?;": "static const u32 bbr_cwnd_min_target = 64;",
r"static const u32 bbr_full_bw_thresh = .*?;": "static const u32 bbr_full_bw_thresh = BBR_UNIT * 101 / 100;",
r"static const u32 bbr_full_bw_cnt = .*?;": "static const u32 bbr_full_bw_cnt = 16;",
r"static const int bbr_extra_acked_gain = .*?;": "static const int bbr_extra_acked_gain = BBR_UNIT * 4;",
r"static const u32 bbr_full_bw_thresh = .*?;": "static const u32 bbr_full_bw_thresh = BBR_UNIT * 105 / 100;",
r"static const u32 bbr_full_bw_cnt = .*?;": "static const u32 bbr_full_bw_cnt = 8;",
r"static const int bbr_extra_acked_gain = .*?;": "static const int bbr_extra_acked_gain = BBR_UNIT * 2;",
r"static const u32 bbr_extra_acked_max_us = .*?;": "static const u32 bbr_extra_acked_max_us = 750 * 1000;",
r"static const bool bbr_precise_ece_ack = .*?;": "static const bool bbr_precise_ece_ack = true;",
r"static const u32 bbr_ecn_max_rtt_us = .*?;": "static const u32 bbr_ecn_max_rtt_us = 0;",
r"static const u32 bbr_beta = .*?;": "static const u32 bbr_beta = BBR_UNIT * 5 / 100;",
r"static const u32 bbr_ecn_alpha_gain = .*?;": "static const u32 bbr_ecn_alpha_gain = BBR_UNIT * 1 / 64;",
r"static const u32 bbr_ecn_alpha_init = .*?;": "static const u32 bbr_ecn_alpha_init = BBR_UNIT * 1 / 4;",
r"static const u32 bbr_ecn_factor = .*?;": "static const u32 bbr_ecn_factor = BBR_UNIT * 5 / 100;",
r"static const u32 bbr_ecn_thresh = .*?;": "static const u32 bbr_ecn_thresh = BBR_UNIT * 9 / 10;",
r"static const u32 bbr_ecn_reprobe_gain = .*?;": "static const u32 bbr_ecn_reprobe_gain = BBR_UNIT;",
r"static const u32 bbr_loss_thresh = [^\n]*": "static const u32 bbr_loss_thresh = BBR_UNIT * 10 / 100; /* max: tolerate 10% loss before backing off */",
r"static const u32 bbr_beta = .*?;": "static const u32 bbr_beta = BBR_UNIT * 20 / 100;",
r"static const u32 bbr_ecn_alpha_gain = .*?;": "static const u32 bbr_ecn_alpha_gain = BBR_UNIT * 1 / 32;",
r"static const u32 bbr_ecn_alpha_init = .*?;": "static const u32 bbr_ecn_alpha_init = BBR_UNIT * 1 / 2;",
r"static const u32 bbr_ecn_factor = .*?;": "static const u32 bbr_ecn_factor = BBR_UNIT * 20 / 100;",
r"static const u32 bbr_ecn_thresh = .*?;": "static const u32 bbr_ecn_thresh = BBR_UNIT * 7 / 10;",
r"static const u32 bbr_ecn_reprobe_gain = .*?;": "static const u32 bbr_ecn_reprobe_gain = BBR_UNIT * 3 / 4;",
r"static const u32 bbr_loss_thresh = [^\n]*": "static const u32 bbr_loss_thresh = BBR_UNIT * 3 / 100; /* max: tolerate 3% loss before backing off */",
r"static const bool bbr_loss_probe_recovery = .*?;": "static const bool bbr_loss_probe_recovery = true;",
r"static const u32 bbr_full_loss_cnt = .*?;": "static const u32 bbr_full_loss_cnt = 24;",
r"static const u32 bbr_full_ecn_cnt = .*?;": "static const u32 bbr_full_ecn_cnt = 8;",
r"static const u32 bbr_inflight_headroom = .*?;": "static const u32 bbr_inflight_headroom = BBR_UNIT * 1 / 100;",
r"static const u32 bbr_bw_probe_cwnd_gain = .*?;": "static const u32 bbr_bw_probe_cwnd_gain = 3;",
r"static const u32 bbr_bw_probe_max_rounds = .*?;": "static const u32 bbr_bw_probe_max_rounds = 4;",
r"static const u32 bbr_bw_probe_rand_rounds = .*?;": "static const u32 bbr_bw_probe_rand_rounds = 1;",
r"static const u32 bbr_bw_probe_base_us = .*?;": "static const u32 bbr_bw_probe_base_us = 100 * 1000;",
r"static const u32 bbr_bw_probe_rand_us = .*?;": "static const u32 bbr_bw_probe_rand_us = 50 * 1000;",
r"static const u32 bbr_full_loss_cnt = .*?;": "static const u32 bbr_full_loss_cnt = 8;",
r"static const u32 bbr_full_ecn_cnt = .*?;": "static const u32 bbr_full_ecn_cnt = 4;",
r"static const u32 bbr_inflight_headroom = .*?;": "static const u32 bbr_inflight_headroom = BBR_UNIT * 10 / 100;",
r"static const u32 bbr_bw_probe_cwnd_gain = .*?;": "static const u32 bbr_bw_probe_cwnd_gain = 2;",
r"static const u32 bbr_bw_probe_max_rounds = .*?;": "static const u32 bbr_bw_probe_max_rounds = 16;",
r"static const u32 bbr_bw_probe_rand_rounds = .*?;": "static const u32 bbr_bw_probe_rand_rounds = 2;",
r"static const u32 bbr_bw_probe_base_us = .*?;": "static const u32 bbr_bw_probe_base_us = 750 * 1000;",
r"static const u32 bbr_bw_probe_rand_us = .*?;": "static const u32 bbr_bw_probe_rand_us = 250 * 1000;",
}
missing = []
@@ -69,10 +69,10 @@ pacing_pattern = re.compile(
re.S,
)
pacing_replacement = """static const int bbr_pacing_gain[] = {
\tBBR_UNIT * 7 / 2,\t/* UP: extreme but still feedback-bound */
\tBBR_UNIT / 2,\t\t/* DOWN: preserve a minimal drain phase */
\tBBR_UNIT * 5 / 4,\t/* CRUISE: keep pressure on the pipe */
\tBBR_UNIT * 2,\t\t/* REFILL: refill aggressively */
\tBBR_UNIT * 3 / 2,\t/* UP: aggressive but keep BBR's feedback usable */
\tBBR_UNIT * 3 / 4,\t/* DOWN: drain the queue after probing */
\tBBR_UNIT,\t\t/* CRUISE: hold the measured pipe */
\tBBR_UNIT * 5 / 4,\t/* REFILL: refill faster than standard BBRv3 */
};"""
text, pacing_count = pacing_pattern.subn(pacing_replacement, text, count=1)
if pacing_count != 1:
scripts/build-bbrv3-max-kernel.sh
+1 -1
View File
@@ -54,7 +54,7 @@ bash "$repo_root/scripts/apply-bbrv3-max-profile.sh"
grep -v "MODULE_DESCRIPTION" net/ipv4/tcp_bbr.c > net/ipv4/tcp_bbr.c.tmp
mv net/ipv4/tcp_bbr.c.tmp net/ipv4/tcp_bbr.c
echo 'MODULE_DESCRIPTION("TCP BBR v3 Max - extreme throughput profile by Joey");' >> net/ipv4/tcp_bbr.c
echo 'MODULE_DESCRIPTION("TCP BBR v3 Max - aggressive throughput profile by Joey");' >> net/ipv4/tcp_bbr.c
IFS='.' read -r v p s <<< "$kernel_version"
sed -i "s/^VERSION *=.*/VERSION = $v/" Makefile