freebsd разница в задержке больших и маленьких пакетов

Phoenix

 # ping -l 40  -s 10240 ya.ru                

PING ya.ru (87.250.250.3): 10240 data bytes

10248 bytes from 87.250.250.3: icmp_seq=0 ttl=54 time=4.865 ms

10248 bytes from 87.250.250.3: icmp_seq=1 ttl=54 time=5.714 ms

10248 bytes from 87.250.250.3: icmp_seq=2 ttl=54 time=6.600 ms

10248 bytes from 87.250.250.3: icmp_seq=3 ttl=54 time=7.506 ms

10248 bytes from 87.250.250.3: icmp_seq=4 ttl=54 time=8.405 ms

10248 bytes from 87.250.250.3: icmp_seq=5 ttl=54 time=9.307 ms

10248 bytes from 87.250.250.3: icmp_seq=6 ttl=54 time=10.209 ms

10248 bytes from 87.250.250.3: icmp_seq=7 ttl=54 time=11.112 ms

10248 bytes from 87.250.250.3: icmp_seq=8 ttl=54 time=12.015 ms

10248 bytes from 87.250.250.3: icmp_seq=9 ttl=54 time=12.916 ms

10248 bytes from 87.250.250.3: icmp_seq=10 ttl=54 time=13.819 ms

10248 bytes from 87.250.250.3: icmp_seq=11 ttl=54 time=14.723 ms

10248 bytes from 87.250.250.3: icmp_seq=12 ttl=54 time=15.626 ms

10248 bytes from 87.250.250.3: icmp_seq=13 ttl=54 time=16.533 ms

10248 bytes from 87.250.250.3: icmp_seq=14 ttl=54 time=17.429 ms

10248 bytes from 87.250.250.3: icmp_seq=15 ttl=54 time=18.331 ms

10248 bytes from 87.250.250.3: icmp_seq=16 ttl=54 time=19.231 ms

10248 bytes from 87.250.250.3: icmp_seq=17 ttl=54 time=20.133 ms

10248 bytes from 87.250.250.3: icmp_seq=18 ttl=54 time=21.031 ms

10248 bytes from 87.250.250.3: icmp_seq=19 ttl=54 time=21.933 ms

10248 bytes from 87.250.250.3: icmp_seq=20 ttl=54 time=22.833 ms

10248 bytes from 87.250.250.3: icmp_seq=21 ttl=54 time=23.735 ms

10248 bytes from 87.250.250.3: icmp_seq=22 ttl=54 time=24.639 ms

10248 bytes from 87.250.250.3: icmp_seq=23 ttl=54 time=25.544 ms

10248 bytes from 87.250.250.3: icmp_seq=24 ttl=54 time=26.447 ms

10248 bytes from 87.250.250.3: icmp_seq=25 ttl=54 time=27.357 ms

10248 bytes from 87.250.250.3: icmp_seq=26 ttl=54 time=28.259 ms

10248 bytes from 87.250.250.3: icmp_seq=27 ttl=54 time=29.159 ms

10248 bytes from 87.250.250.3: icmp_seq=28 ttl=54 time=30.063 ms

10248 bytes from 87.250.250.3: icmp_seq=29 ttl=54 time=30.968 ms

10248 bytes from 87.250.250.3: icmp_seq=30 ttl=54 time=31.869 ms

10248 bytes from 87.250.250.3: icmp_seq=31 ttl=54 time=32.769 ms

10248 bytes from 87.250.250.3: icmp_seq=32 ttl=54 time=33.679 ms

10248 bytes from 87.250.250.3: icmp_seq=33 ttl=54 time=34.581 ms

10248 bytes from 87.250.250.3: icmp_seq=34 ttl=54 time=35.479 ms

10248 bytes from 87.250.250.3: icmp_seq=35 ttl=54 time=36.368 ms

10248 bytes from 87.250.250.3: icmp_seq=36 ttl=54 time=37.273 ms

10248 bytes from 87.250.250.3: icmp_seq=37 ttl=54 time=38.171 ms

10248 bytes from 87.250.250.3: icmp_seq=38 ttl=54 time=39.081 ms

10248 bytes from 87.250.250.3: icmp_seq=39 ttl=54 time=39.985 ms

10248 bytes from 87.250.250.3: icmp_seq=40 ttl=54 time=4.746 ms

10248 bytes from 87.250.250.3: icmp_seq=41 ttl=54 time=4.509 ms

^C

--- ya.ru ping statistics ---

42 packets transmitted, 42 packets received, 0.0% packet loss

round-trip min/avg/max/stddev = 4.509/21.546/39.985/10.842 ms



# ping -l 40  -s 20 ya.ru   

PING ya.ru (87.250.251.3): 20 data bytes

28 bytes from 87.250.251.3: icmp_seq=0 ttl=53 time=2.832 ms

28 bytes from 87.250.251.3: icmp_seq=3 ttl=53 time=2.805 ms

28 bytes from 87.250.251.3: icmp_seq=1 ttl=53 time=2.884 ms

28 bytes from 87.250.251.3: icmp_seq=2 ttl=53 time=2.893 ms

28 bytes from 87.250.251.3: icmp_seq=4 ttl=53 time=2.891 ms

28 bytes from 87.250.251.3: icmp_seq=5 ttl=53 time=2.895 ms

28 bytes from 87.250.251.3: icmp_seq=8 ttl=53 time=2.946 ms

28 bytes from 87.250.251.3: icmp_seq=9 ttl=53 time=2.988 ms

28 bytes from 87.250.251.3: icmp_seq=7 ttl=53 time=3.015 ms

28 bytes from 87.250.251.3: icmp_seq=6 ttl=53 time=3.032 ms

28 bytes from 87.250.251.3: icmp_seq=10 ttl=53 time=3.014 ms

28 bytes from 87.250.251.3: icmp_seq=11 ttl=53 time=3.014 ms

28 bytes from 87.250.251.3: icmp_seq=12 ttl=53 time=3.016 ms

28 bytes from 87.250.251.3: icmp_seq=13 ttl=53 time=3.018 ms

28 bytes from 87.250.251.3: icmp_seq=14 ttl=53 time=3.019 ms

28 bytes from 87.250.251.3: icmp_seq=16 ttl=53 time=3.014 ms

28 bytes from 87.250.251.3: icmp_seq=17 ttl=53 time=3.014 ms

28 bytes from 87.250.251.3: icmp_seq=19 ttl=53 time=3.009 ms

28 bytes from 87.250.251.3: icmp_seq=20 ttl=53 time=3.012 ms

28 bytes from 87.250.251.3: icmp_seq=22 ttl=53 time=3.007 ms

28 bytes from 87.250.251.3: icmp_seq=26 ttl=53 time=2.991 ms

28 bytes from 87.250.251.3: icmp_seq=27 ttl=53 time=3.003 ms

28 bytes from 87.250.251.3: icmp_seq=29 ttl=53 time=2.997 ms

28 bytes from 87.250.251.3: icmp_seq=28 ttl=53 time=3.011 ms

28 bytes from 87.250.251.3: icmp_seq=15 ttl=53 time=3.109 ms

28 bytes from 87.250.251.3: icmp_seq=34 ttl=53 time=2.987 ms

28 bytes from 87.250.251.3: icmp_seq=35 ttl=53 time=2.991 ms

28 bytes from 87.250.251.3: icmp_seq=38 ttl=53 time=2.983 ms

28 bytes from 87.250.251.3: icmp_seq=18 ttl=53 time=3.126 ms

28 bytes from 87.250.251.3: icmp_seq=31 ttl=53 time=3.046 ms

28 bytes from 87.250.251.3: icmp_seq=33 ttl=53 time=3.040 ms

28 bytes from 87.250.251.3: icmp_seq=39 ttl=53 time=3.015 ms

28 bytes from 87.250.251.3: icmp_seq=36 ttl=53 time=3.041 ms

28 bytes from 87.250.251.3: icmp_seq=37 ttl=53 time=3.042 ms

28 bytes from 87.250.251.3: icmp_seq=21 ttl=53 time=3.155 ms

28 bytes from 87.250.251.3: icmp_seq=23 ttl=53 time=3.150 ms

28 bytes from 87.250.251.3: icmp_seq=24 ttl=53 time=3.151 ms

28 bytes from 87.250.251.3: icmp_seq=25 ttl=53 time=3.217 ms

28 bytes from 87.250.251.3: icmp_seq=30 ttl=53 time=3.192 ms

28 bytes from 87.250.251.3: icmp_seq=32 ttl=53 time=3.185 ms

с чем связана лесенка в больших пакетах и её отсутствие в маленьких? фрагментация по таймеру происходит и по одному пакету?

Marinavo_0507

ping -l 40
вот с этим связано :ooo:

Marinavo_0507

более интересный вопрос: почему ttl разный :ooo:

Phoenix

запустил ещё раз - стало 51. скорей всего у яндекса разные серваки/маршрутизаторы отвечают.

AlexV769

более интересный вопрос: почему ttl разный
А чего удивительного-то? Видно же, что IP-адреса разные :)
Ну и как бы рассказ про всякое

Marinavo_0507

сцылко не открывается, таймаут
а откуда настолько аццкий реордеринг?

sergey_m

The server at events.yandex-team.ru is taking too long to respond.

yolki

yandex-team - это для внутрикорпоративных междусобойчиков
правильная ссылка такая: http://events.yandex.ru/talks/329/

sergey_m

По теме треда: мне кажется, что эта "лесенка" не особенность FreeBSD, а особенность того, что отвечает на icmp echo со стороны ya.ru.

Phoenix

Да, скорей всего.
Просто я это заметил между двумя компами и в туннеле. Потом решил тестануть яндекс и уже распечатку по яндексу выложил

sergey_m

Ну тогда это может быть особенность туннеля. В одной сети я не вижу этого эффекта.
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