linux - tcp_delack_min linux tcp 内核参数在哪里？

Question

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。

    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

tcp_delack_min 在哪里？？？

Answer 1

内核源码中:

./include/net/tcp.h:#define TCP_DELACK_MAX ((unsigned)(HZ/5))
/* maximal time to delay before sending an ACK */

./include/net/tcp.h:#define TCP_DELACK_MIN ((unsigned)(HZ/25))
/* minimal time to delay before sending an ACK */