Co sekundę odczuwam duże opóźnienie Wi-Fi na moim Macbooku Pro z najnowszym systemem macOS Sierra.
Myślałem, że mój stary router może być winowajcą, więc kupiłem nowy. Jednak nowy router tylko pogorszył sytuację, przechodząc od problemów z opóźnieniami do około 20% utraty pakietów. Wypróbowanie tego rozwiązania z innego pytania superużytkownika przynajmniej sprowadziło utratę pakietów ponownie do 0, ale problem z opóźnieniem pozostaje.
- Pingowanie tego samego routera z innego komputera za pośrednictwem sieci przewodowej powoduje stały ping 2 ms.
- Pingowanie z mojego telefonu przez Wi-Fi powoduje stały ping 4ms (stary telefon z Androidem).
- Uruchomienie tych samych testów w mojej sieci w pracy daje dokładnie takie same wyniki. Jako problem wskazałem wifi mojego Macbooka Pro.
Oto wykres z speedtest.net. Otrzymuję ten sam wynik za każdym razem, gdy uruchamiam ten test na Wi-Fi: ~ 5 sekundowy spadek prędkości pobierania.
Podczas pingowania mojego routera na 192.168.1.1 z mojego MBP (domyślnie 1 Hz), otrzymuję następujący wzorzec:
64 bytes from 192.168.1.1: icmp_seq=0 ttl=64 time=86.944 ms
64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=121.099 ms
64 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=1.664 ms
64 bytes from 192.168.1.1: icmp_seq=3 ttl=64 time=31.493 ms
64 bytes from 192.168.1.1: icmp_seq=4 ttl=64 time=66.042 ms
64 bytes from 192.168.1.1: icmp_seq=5 ttl=64 time=99.786 ms
64 bytes from 192.168.1.1: icmp_seq=6 ttl=64 time=2.459 ms
64 bytes from 192.168.1.1: icmp_seq=7 ttl=64 time=2.183 ms
64 bytes from 192.168.1.1: icmp_seq=8 ttl=64 time=1.867 ms
64 bytes from 192.168.1.1: icmp_seq=9 ttl=64 time=2.662 ms
64 bytes from 192.168.1.1: icmp_seq=10 ttl=64 time=2.065 ms
64 bytes from 192.168.1.1: icmp_seq=11 ttl=64 time=0.877 ms
64 bytes from 192.168.1.1: icmp_seq=12 ttl=64 time=63.238 ms
64 bytes from 192.168.1.1: icmp_seq=13 ttl=64 time=101.419 ms
64 bytes from 192.168.1.1: icmp_seq=14 ttl=64 time=3.704 ms
64 bytes from 192.168.1.1: icmp_seq=15 ttl=64 time=36.746 ms
64 bytes from 192.168.1.1: icmp_seq=16 ttl=64 time=51.972 ms
64 bytes from 192.168.1.1: icmp_seq=17 ttl=64 time=86.453 ms
64 bytes from 192.168.1.1: icmp_seq=18 ttl=64 time=125.786 ms
64 bytes from 192.168.1.1: icmp_seq=19 ttl=64 time=1.113 ms
64 bytes from 192.168.1.1: icmp_seq=20 ttl=64 time=1.973 ms
64 bytes from 192.168.1.1: icmp_seq=21 ttl=64 time=2.575 ms
64 bytes from 192.168.1.1: icmp_seq=22 ttl=64 time=1.957 ms
64 bytes from 192.168.1.1: icmp_seq=23 ttl=64 time=2.209 ms
64 bytes from 192.168.1.1: icmp_seq=24 ttl=64 time=2.815 ms
64 bytes from 192.168.1.1: icmp_seq=25 ttl=64 time=1.924 ms
64 bytes from 192.168.1.1: icmp_seq=26 ttl=64 time=150.076 ms
64 bytes from 192.168.1.1: icmp_seq=27 ttl=64 time=53.943 ms
64 bytes from 192.168.1.1: icmp_seq=28 ttl=64 time=84.633 ms
64 bytes from 192.168.1.1: icmp_seq=29 ttl=64 time=109.776 ms
Pingowanie przy 10 Hz daje podobny wzór, z utratą pakietów:
64 bytes from 192.168.1.1: icmp_seq=11 ttl=64 time=1.078 ms
64 bytes from 192.168.1.1: icmp_seq=12 ttl=64 time=1.347 ms
64 bytes from 192.168.1.1: icmp_seq=13 ttl=64 time=1.041 ms
64 bytes from 192.168.1.1: icmp_seq=14 ttl=64 time=1.031 ms
64 bytes from 192.168.1.1: icmp_seq=15 ttl=64 time=1.098 ms
64 bytes from 192.168.1.1: icmp_seq=16 ttl=64 time=1.098 ms
64 bytes from 192.168.1.1: icmp_seq=17 ttl=64 time=0.944 ms
64 bytes from 192.168.1.1: icmp_seq=18 ttl=64 time=3.185 ms
64 bytes from 192.168.1.1: icmp_seq=19 ttl=64 time=8.736 ms
64 bytes from 192.168.1.1: icmp_seq=20 ttl=64 time=6.846 ms
64 bytes from 192.168.1.1: icmp_seq=21 ttl=64 time=1.009 ms
64 bytes from 192.168.1.1: icmp_seq=22 ttl=64 time=0.900 ms
64 bytes from 192.168.1.1: icmp_seq=23 ttl=64 time=0.985 ms
64 bytes from 192.168.1.1: icmp_seq=24 ttl=64 time=0.898 ms
64 bytes from 192.168.1.1: icmp_seq=25 ttl=64 time=0.919 ms
64 bytes from 192.168.1.1: icmp_seq=26 ttl=64 time=3.679 ms
64 bytes from 192.168.1.1: icmp_seq=27 ttl=64 time=1.468 ms
64 bytes from 192.168.1.1: icmp_seq=28 ttl=64 time=6.889 ms
64 bytes from 192.168.1.1: icmp_seq=29 ttl=64 time=0.953 ms
64 bytes from 192.168.1.1: icmp_seq=30 ttl=64 time=1.076 ms
64 bytes from 192.168.1.1: icmp_seq=31 ttl=64 time=0.984 ms
64 bytes from 192.168.1.1: icmp_seq=32 ttl=64 time=0.946 ms
64 bytes from 192.168.1.1: icmp_seq=33 ttl=64 time=0.872 ms
64 bytes from 192.168.1.1: icmp_seq=34 ttl=64 time=0.844 ms
Request timeout for icmp_seq 35
64 bytes from 192.168.1.1: icmp_seq=35 ttl=64 time=169.385 ms
64 bytes from 192.168.1.1: icmp_seq=36 ttl=64 time=68.897 ms
64 bytes from 192.168.1.1: icmp_seq=37 ttl=64 time=203.066 ms
64 bytes from 192.168.1.1: icmp_seq=38 ttl=64 time=98.576 ms
64 bytes from 192.168.1.1: icmp_seq=39 ttl=64 time=0.891 ms
64 bytes from 192.168.1.1: icmp_seq=40 ttl=64 time=122.991 ms
64 bytes from 192.168.1.1: icmp_seq=41 ttl=64 time=18.420 ms
64 bytes from 192.168.1.1: icmp_seq=42 ttl=64 time=90.086 ms
64 bytes from 192.168.1.1: icmp_seq=43 ttl=64 time=1.029 ms
64 bytes from 192.168.1.1: icmp_seq=44 ttl=64 time=65.268 ms
64 bytes from 192.168.1.1: icmp_seq=45 ttl=64 time=92.355 ms
64 bytes from 192.168.1.1: icmp_seq=46 ttl=64 time=0.922 ms
64 bytes from 192.168.1.1: icmp_seq=47 ttl=64 time=66.303 ms
64 bytes from 192.168.1.1: icmp_seq=49 ttl=64 time=38.938 ms
Request timeout for icmp_seq 50
64 bytes from 192.168.1.1: icmp_seq=50 ttl=64 time=129.508 ms
64 bytes from 192.168.1.1: icmp_seq=51 ttl=64 time=24.909 ms
64 bytes from 192.168.1.1: icmp_seq=52 ttl=64 time=86.077 ms
64 bytes from 192.168.1.1: icmp_seq=53 ttl=64 time=0.967 ms
64 bytes from 192.168.1.1: icmp_seq=54 ttl=64 time=198.241 ms
64 bytes from 192.168.1.1: icmp_seq=55 ttl=64 time=93.977 ms
64 bytes from 192.168.1.1: icmp_seq=56 ttl=64 time=0.886 ms
64 bytes from 192.168.1.1: icmp_seq=57 ttl=64 time=70.865 ms
64 bytes from 192.168.1.1: icmp_seq=58 ttl=64 time=0.809 ms
64 bytes from 192.168.1.1: icmp_seq=59 ttl=64 time=41.784 ms
Request timeout for icmp_seq 61
64 bytes from 192.168.1.1: icmp_seq=62 ttl=64 time=90.258 ms
64 bytes from 192.168.1.1: icmp_seq=63 ttl=64 time=1.207 ms
64 bytes from 192.168.1.1: icmp_seq=64 ttl=64 time=56.740 ms
64 bytes from 192.168.1.1: icmp_seq=65 ttl=64 time=85.553 ms
64 bytes from 192.168.1.1: icmp_seq=66 ttl=64 time=0.877 ms
64 bytes from 192.168.1.1: icmp_seq=67 ttl=64 time=62.510 ms
64 bytes from 192.168.1.1: icmp_seq=68 ttl=64 time=1.423 ms
64 bytes from 192.168.1.1: icmp_seq=69 ttl=64 time=32.156 ms
Request timeout for icmp_seq 70
64 bytes from 192.168.1.1: icmp_seq=70 ttl=64 time=116.203 ms
64 bytes from 192.168.1.1: icmp_seq=71 ttl=64 time=12.917 ms
64 bytes from 192.168.1.1: icmp_seq=72 ttl=64 time=86.092 ms
64 bytes from 192.168.1.1: icmp_seq=73 ttl=64 time=0.886 ms
64 bytes from 192.168.1.1: icmp_seq=74 ttl=64 time=59.710 ms
64 bytes from 192.168.1.1: icmp_seq=75 ttl=64 time=90.512 ms
64 bytes from 192.168.1.1: icmp_seq=76 ttl=64 time=4.074 ms
64 bytes from 192.168.1.1: icmp_seq=77 ttl=64 time=111.984 ms
64 bytes from 192.168.1.1: icmp_seq=78 ttl=64 time=8.640 ms
64 bytes from 192.168.1.1: icmp_seq=79 ttl=64 time=152.531 ms
64 bytes from 192.168.1.1: icmp_seq=80 ttl=64 time=47.904 ms
64 bytes from 192.168.1.1: icmp_seq=81 ttl=64 time=0.907 ms
64 bytes from 192.168.1.1: icmp_seq=82 ttl=64 time=75.134 ms
64 bytes from 192.168.1.1: icmp_seq=83 ttl=64 time=1.012 ms
64 bytes from 192.168.1.1: icmp_seq=84 ttl=64 time=42.029 ms
64 bytes from 192.168.1.1: icmp_seq=85 ttl=64 time=116.824 ms
64 bytes from 192.168.1.1: icmp_seq=86 ttl=64 time=14.382 ms
64 bytes from 192.168.1.1: icmp_seq=87 ttl=64 time=49.502 ms
64 bytes from 192.168.1.1: icmp_seq=88 ttl=64 time=121.049 ms
64 bytes from 192.168.1.1: icmp_seq=89 ttl=64 time=21.011 ms
64 bytes from 192.168.1.1: icmp_seq=90 ttl=64 time=95.133 ms
64 bytes from 192.168.1.1: icmp_seq=91 ttl=64 time=1.043 ms
64 bytes from 192.168.1.1: icmp_seq=92 ttl=64 time=67.754 ms
64 bytes from 192.168.1.1: icmp_seq=93 ttl=64 time=0.876 ms
64 bytes from 192.168.1.1: icmp_seq=94 ttl=64 time=39.027 ms
64 bytes from 192.168.1.1: icmp_seq=95 ttl=64 time=110.931 ms
64 bytes from 192.168.1.1: icmp_seq=96 ttl=64 time=7.023 ms
64 bytes from 192.168.1.1: icmp_seq=97 ttl=64 time=36.249 ms
64 bytes from 192.168.1.1: icmp_seq=98 ttl=64 time=116.108 ms
64 bytes from 192.168.1.1: icmp_seq=99 ttl=64 time=11.732 ms
64 bytes from 192.168.1.1: icmp_seq=100 ttl=64 time=82.880 ms
64 bytes from 192.168.1.1: icmp_seq=101 ttl=64 time=0.956 ms
64 bytes from 192.168.1.1: icmp_seq=102 ttl=64 time=58.007 ms
64 bytes from 192.168.1.1: icmp_seq=103 ttl=64 time=126.818 ms
64 bytes from 192.168.1.1: icmp_seq=104 ttl=64 time=22.750 ms
64 bytes from 192.168.1.1: icmp_seq=105 ttl=64 time=99.126 ms
64 bytes from 192.168.1.1: icmp_seq=106 ttl=64 time=131.419 ms
64 bytes from 192.168.1.1: icmp_seq=107 ttl=64 time=28.596 ms
64 bytes from 192.168.1.1: icmp_seq=108 ttl=64 time=110.326 ms
64 bytes from 192.168.1.1: icmp_seq=109 ttl=64 time=5.859 ms
64 bytes from 192.168.1.1: icmp_seq=110 ttl=64 time=70.852 ms
64 bytes from 192.168.1.1: icmp_seq=111 ttl=64 time=0.855 ms
64 bytes from 192.168.1.1: icmp_seq=112 ttl=64 time=41.162 ms
64 bytes from 192.168.1.1: icmp_seq=113 ttl=64 time=114.014 ms
64 bytes from 192.168.1.1: icmp_seq=114 ttl=64 time=9.519 ms
Request timeout for icmp_seq 116
64 bytes from 192.168.1.1: icmp_seq=116 ttl=64 time=121.307 ms
64 bytes from 192.168.1.1: icmp_seq=117 ttl=64 time=16.106 ms
64 bytes from 192.168.1.1: icmp_seq=118 ttl=64 time=1.082 ms
64 bytes from 192.168.1.1: icmp_seq=119 ttl=64 time=1.086 ms
64 bytes from 192.168.1.1: icmp_seq=120 ttl=64 time=1.386 ms
64 bytes from 192.168.1.1: icmp_seq=121 ttl=64 time=1.002 ms
64 bytes from 192.168.1.1: icmp_seq=122 ttl=64 time=5.472 ms
64 bytes from 192.168.1.1: icmp_seq=123 ttl=64 time=1.060 ms
64 bytes from 192.168.1.1: icmp_seq=124 ttl=64 time=1.526 ms
64 bytes from 192.168.1.1: icmp_seq=125 ttl=64 time=0.998 ms
64 bytes from 192.168.1.1: icmp_seq=126 ttl=64 time=1.182 ms
64 bytes from 192.168.1.1: icmp_seq=127 ttl=64 time=0.942 ms
64 bytes from 192.168.1.1: icmp_seq=128 ttl=64 time=3.221 ms
64 bytes from 192.168.1.1: icmp_seq=129 ttl=64 time=16.895 ms
64 bytes from 192.168.1.1: icmp_seq=130 ttl=64 time=1.251 ms
64 bytes from 192.168.1.1: icmp_seq=131 ttl=64 time=3.832 ms
64 bytes from 192.168.1.1: icmp_seq=132 ttl=64 time=5.403 ms
64 bytes from 192.168.1.1: icmp_seq=133 ttl=64 time=1.194 ms
64 bytes from 192.168.1.1: icmp_seq=134 ttl=64 time=1.287 ms
64 bytes from 192.168.1.1: icmp_seq=135 ttl=64 time=2.274 ms
64 bytes from 192.168.1.1: icmp_seq=136 ttl=64 time=0.863 ms
64 bytes from 192.168.1.1: icmp_seq=138 ttl=64 time=1.200 ms
Innymi słowy: ~ 5 sekund normalnych pingów, następnie ~ 5 sekund poważnych problemów z opóźnieniami, a nawet przekroczeń czasu, jeśli częstotliwość pingów jest wystarczająco wysoka.
Próbowałem dowiedzieć się, czy przyczyną tego może być niedawna instalacja aplikacji, dlatego już wyłącziłem większość aplikacji (Dropbox, Little Snitch). Jednak teraz brakuje mi opcji. Właśnie uruchomiłem Wireshark podczas pingowania i nie widzę żadnej aktywności sieciowej z wyjątkiem tych pingów.
Nie jestem pewien, co jeszcze mogę spróbować rozwiązać.
sudo ping -i 0.1 192.168.1.1
(dziesięć pingów na sekundę) ma inne wyniki. To sprawia, że Twój klient wysyła jeden sygnał ping na typowy interwał sygnału nawigacyjnego (dziesiąta część sekundy), co może powstrzymać Oszczędzanie energii przed uruchomieniem.