ZFS Replication to another TrueNAS box uses just ONE stream!?!

TrueNAS General
21

is there a way to print out all the current network variables? I know you can do it one at a time. is there a list or another way to do it?

22

sysctl -a | grep net.ipv4.tcp

EDIT: Here’s my system so you have reference to some defaults. Hope that helps.

root@prod[~]# sysctl -a | grep net.ipv4.tcp
net.ipv4.tcp_abort_on_overflow = 0
net.ipv4.tcp_adv_win_scale = 1
net.ipv4.tcp_allowed_congestion_control = reno cubic
net.ipv4.tcp_app_win = 31
net.ipv4.tcp_autocorking = 1
net.ipv4.tcp_available_congestion_control = reno cubic
net.ipv4.tcp_available_ulp = mptcp tls
net.ipv4.tcp_base_mss = 1024
net.ipv4.tcp_challenge_ack_limit = 2147483647
net.ipv4.tcp_child_ehash_entries = 0
net.ipv4.tcp_comp_sack_delay_ns = 1000000
net.ipv4.tcp_comp_sack_nr = 44
net.ipv4.tcp_comp_sack_slack_ns = 100000
net.ipv4.tcp_congestion_control = cubic
net.ipv4.tcp_dsack = 1
net.ipv4.tcp_early_demux = 1
net.ipv4.tcp_early_retrans = 3
net.ipv4.tcp_ecn = 2
net.ipv4.tcp_ecn_fallback = 1
net.ipv4.tcp_ehash_entries = 262144
net.ipv4.tcp_fack = 0
net.ipv4.tcp_fastopen = 1
net.ipv4.tcp_fastopen_blackhole_timeout_sec = 0
net.ipv4.tcp_fastopen_key = 00000000-00000000-00000000-00000000
net.ipv4.tcp_fin_timeout = 60
net.ipv4.tcp_frto = 2
net.ipv4.tcp_fwmark_accept = 0
net.ipv4.tcp_invalid_ratelimit = 500
net.ipv4.tcp_keepalive_intvl = 75
net.ipv4.tcp_keepalive_probes = 9
net.ipv4.tcp_keepalive_time = 7200
net.ipv4.tcp_l3mdev_accept = 0
net.ipv4.tcp_limit_output_bytes = 1048576
net.ipv4.tcp_low_latency = 0
net.ipv4.tcp_max_orphans = 131072
net.ipv4.tcp_max_reordering = 300
net.ipv4.tcp_max_syn_backlog = 2048
net.ipv4.tcp_max_tw_buckets = 131072
net.ipv4.tcp_mem = 381984       509315  763968
net.ipv4.tcp_migrate_req = 0
net.ipv4.tcp_min_rtt_wlen = 300
net.ipv4.tcp_min_snd_mss = 48
net.ipv4.tcp_min_tso_segs = 2
net.ipv4.tcp_moderate_rcvbuf = 1
net.ipv4.tcp_mtu_probe_floor = 48
net.ipv4.tcp_mtu_probing = 0
net.ipv4.tcp_no_metrics_save = 0
net.ipv4.tcp_no_ssthresh_metrics_save = 1
net.ipv4.tcp_notsent_lowat = 4294967295
net.ipv4.tcp_orphan_retries = 0
net.ipv4.tcp_pacing_ca_ratio = 120
net.ipv4.tcp_pacing_ss_ratio = 200
net.ipv4.tcp_plb_cong_thresh = 128
net.ipv4.tcp_plb_enabled = 0
net.ipv4.tcp_plb_idle_rehash_rounds = 3
net.ipv4.tcp_plb_rehash_rounds = 12
net.ipv4.tcp_plb_suspend_rto_sec = 60
net.ipv4.tcp_probe_interval = 600
net.ipv4.tcp_probe_threshold = 8
net.ipv4.tcp_recovery = 1
net.ipv4.tcp_reflect_tos = 0
net.ipv4.tcp_reordering = 3
net.ipv4.tcp_retrans_collapse = 1
net.ipv4.tcp_retries1 = 3
net.ipv4.tcp_retries2 = 15
net.ipv4.tcp_rfc1337 = 0
net.ipv4.tcp_rmem = 4096        131072  6291456
net.ipv4.tcp_sack = 1
net.ipv4.tcp_shrink_window = 0
net.ipv4.tcp_slow_start_after_idle = 1
net.ipv4.tcp_stdurg = 0
net.ipv4.tcp_syn_linear_timeouts = 4
net.ipv4.tcp_syn_retries = 6
net.ipv4.tcp_synack_retries = 5
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_thin_linear_timeouts = 0
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_tso_rtt_log = 9
net.ipv4.tcp_tso_win_divisor = 3
net.ipv4.tcp_tw_reuse = 2
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_wmem = 4096        16384   4194304
net.ipv4.tcp_workaround_signed_windows = 0
root@prod[~]#
1 Like
23

sysctl net.ipv4.tcp

3 Likes
24

So you optimised it for a higher latency connection.
I wonder what the trade-offs in other scenarios will be.

25

here you go

root@truenas[/mnt/main/apps]# sysctl net.ipv4.tcp

net.ipv4.tcp_abort_on_overflow = 0
net.ipv4.tcp_adv_win_scale = -2
net.ipv4.tcp_allowed_congestion_control = reno cubic bbr
net.ipv4.tcp_app_win = 31
net.ipv4.tcp_autocorking = 1
net.ipv4.tcp_available_congestion_control = reno cubic bbr
net.ipv4.tcp_available_ulp = mptcp tls
net.ipv4.tcp_base_mss = 1024
net.ipv4.tcp_challenge_ack_limit = 2147483647
net.ipv4.tcp_child_ehash_entries = 0
net.ipv4.tcp_comp_sack_delay_ns = 1000000
net.ipv4.tcp_comp_sack_nr = 44
net.ipv4.tcp_comp_sack_slack_ns = 100000
net.ipv4.tcp_congestion_control = bbr
net.ipv4.tcp_dsack = 1
net.ipv4.tcp_early_demux = 1
net.ipv4.tcp_early_retrans = 3
net.ipv4.tcp_ecn = 2
net.ipv4.tcp_ecn_fallback = 1
net.ipv4.tcp_ehash_entries = 524288
net.ipv4.tcp_fack = 0
net.ipv4.tcp_fastopen = 1
net.ipv4.tcp_fastopen_blackhole_timeout_sec = 0
net.ipv4.tcp_fastopen_key = 00000000-00000000-00000000-00000000
net.ipv4.tcp_fin_timeout = 60
net.ipv4.tcp_frto = 2
net.ipv4.tcp_fwmark_accept = 0
net.ipv4.tcp_invalid_ratelimit = 500
net.ipv4.tcp_keepalive_intvl = 75
net.ipv4.tcp_keepalive_probes = 9
net.ipv4.tcp_keepalive_time = 7200
net.ipv4.tcp_l3mdev_accept = 0
net.ipv4.tcp_limit_output_bytes = 1048576
net.ipv4.tcp_low_latency = 0
net.ipv4.tcp_max_orphans = 262144
net.ipv4.tcp_max_reordering = 300
net.ipv4.tcp_max_syn_backlog = 4096
net.ipv4.tcp_max_tw_buckets = 262144
net.ipv4.tcp_mem = 1540476      2053968 3080952
net.ipv4.tcp_migrate_req = 0
net.ipv4.tcp_min_rtt_wlen = 300
net.ipv4.tcp_min_snd_mss = 48
net.ipv4.tcp_min_tso_segs = 2
net.ipv4.tcp_moderate_rcvbuf = 1
net.ipv4.tcp_mtu_probe_floor = 48
net.ipv4.tcp_mtu_probing = 0
net.ipv4.tcp_no_metrics_save = 0
net.ipv4.tcp_no_ssthresh_metrics_save = 1
net.ipv4.tcp_notsent_lowat = 131072
net.ipv4.tcp_orphan_retries = 0
net.ipv4.tcp_pacing_ca_ratio = 120
net.ipv4.tcp_pacing_ss_ratio = 200
net.ipv4.tcp_plb_cong_thresh = 128
net.ipv4.tcp_plb_enabled = 0
net.ipv4.tcp_plb_idle_rehash_rounds = 3
net.ipv4.tcp_plb_rehash_rounds = 12
net.ipv4.tcp_plb_suspend_rto_sec = 60
net.ipv4.tcp_probe_interval = 600
net.ipv4.tcp_probe_threshold = 8
net.ipv4.tcp_recovery = 1
net.ipv4.tcp_reflect_tos = 0
net.ipv4.tcp_reordering = 3
net.ipv4.tcp_retrans_collapse = 1
net.ipv4.tcp_retries1 = 3
net.ipv4.tcp_retries2 = 15
net.ipv4.tcp_rfc1337 = 0
net.ipv4.tcp_rmem = 4096        87380   12500000
net.ipv4.tcp_sack = 1
net.ipv4.tcp_shrink_window = 0
net.ipv4.tcp_slow_start_after_idle = 1
net.ipv4.tcp_stdurg = 0
net.ipv4.tcp_syn_linear_timeouts = 4
net.ipv4.tcp_syn_retries = 6
net.ipv4.tcp_synack_retries = 5
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_thin_linear_timeouts = 0
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_tso_rtt_log = 9
net.ipv4.tcp_tso_win_divisor = 3
net.ipv4.tcp_tw_reuse = 2
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_wmem = 4096        65536   12500000
net.ipv4.tcp_workaround_signed_windows = 0
root@truenas[/mnt/main/apps]#
root@truenas[/mnt/main/apps]#
26

Where are you at? Im in chicago and speeds FROM servarica are roughly 20-30 MB/s. Can you clarify which parameters you tweaks on the vps to improve speeds?

Thanks