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我使用2.6.9-89.ELsmp＃1 SMP Mon Jun 22 12:31:33 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux 我想控制tcp延迟确认时间。 但是，我找不到tcp_delack_min参数。其中是tcp_delack_min linux tcp内核参数？
sysctl -a | grep tcp
sunrpc.tcp_slot_table_entries = 16
net.ipv4.tcp_slow_start_after_idle = 1
net.ipv4.tcp_workaround_signed_windows = 1
net.ipv4.tcp_bic_beta = 819
net.ipv4.tcp_tso_win_divisor = 8
net.ipv4.tcp_moderate_rcvbuf = 1
net.ipv4.tcp_bic_low_window = 14
net.ipv4.tcp_bic_fast_convergence = 1
net.ipv4.tcp_bic = 1
net.ipv4.tcp_vegas_gamma = 2
net.ipv4.tcp_vegas_beta = 6
net.ipv4.tcp_vegas_alpha = 2
net.ipv4.tcp_vegas_cong_avoid = 0
net.ipv4.tcp_westwood = 0
net.ipv4.tcp_no_metrics_save = 0
net.ipv4.tcp_low_latency = 0
net.ipv4.tcp_frto = 0
net.ipv4.tcp_tw_reuse = 0
net.ipv4.tcp_adv_win_scale = 2
net.ipv4.tcp_app_win = 31
net.ipv4.tcp_rmem = 4096 87380 174760
net.ipv4.tcp_wmem = 4096 16384 131072
net.ipv4.tcp_mem = 786432 1048576 1572864
net.ipv4.tcp_dsack = 1
net.ipv4.tcp_ecn = 0
net.ipv4.tcp_reordering = 3
net.ipv4.tcp_fack = 1
net.ipv4.tcp_orphan_retries = 0
net.ipv4.tcp_max_syn_backlog = 10000
net.ipv4.tcp_rfc1337 = 0
net.ipv4.tcp_stdurg = 0
net.ipv4.tcp_abort_on_overflow = 0
net.ipv4.tcp_tw_recycle = 0
net.ipv4.tcp_syncookies = 0
net.ipv4.tcp_fin_timeout = 60
net.ipv4.tcp_retries2 = 15
net.ipv4.tcp_retries1 = 3
net.ipv4.tcp_keepalive_intvl = 75
net.ipv4.tcp_keepalive_probes = 9
net.ipv4.tcp_keepalive_time = 7200
net.ipv4.tcp_max_tw_buckets = 180000
net.ipv4.tcp_max_orphans = 262144
net.ipv4.tcp_synack_retries = 5
net.ipv4.tcp_syn_retries = 5
net.ipv4.tcp_retrans_collapse = 1
net.ipv4.tcp_sack = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_timestamps = 1
where is tcp_delack_min ???