ping網(wǎng)關(guān)輸出信息中icmp_seq有跳號(hào)的情況

running_life

環(huán)境：
1、用centos6.7或者ubuntu等ping網(wǎng)關(guān)發(fā)現(xiàn)icmp_seq有跳號(hào)的現(xiàn)象，跳號(hào)時(shí)會(huì)卡頓在那，就像丟包一樣，但是沒(méi)有報(bào)出丟包錯(cuò)誤。最后終止ping時(shí)，看到有丟包信息輸出，例如：
2262 packets transmitted, 2219 received, 1% packet loss, time 2264329ms
rtt min/avg/max/mdev = 11.293/12.013/19.907/0.739 ms

65515 bytes from 192.168.0.1: icmp_seq=941 ttl=255 time=165 ms
65515 bytes from 192.168.0.1: icmp_seq=942 ttl=255 time=123 ms
65515 bytes from 192.168.0.1: icmp_seq=943 ttl=255 time=129 ms
65515 bytes from 192.168.0.1: icmp_seq=944 ttl=255 time=120 ms
65515 bytes from 192.168.0.1: icmp_seq=945 ttl=255 time=122 ms
65515 bytes from 192.168.0.1: icmp_seq=946 ttl=255 time=117 ms
65515 bytes from 192.168.0.1: icmp_seq=947 ttl=255 time=118 ms
65515 bytes from 192.168.0.1: icmp_seq=948 ttl=255 time=120 ms
65515 bytes from 192.168.0.1: icmp_seq=949 ttl=255 time=118 ms
65515 bytes from 192.168.0.1: icmp_seq=950 ttl=255 time=118 ms
65515 bytes from 192.168.0.1: icmp_seq=951 ttl=255 time=118 ms
65515 bytes from 192.168.0.1: icmp_seq=952 ttl=255 time=127 ms
65515 bytes from 192.168.0.1: icmp_seq=953 ttl=255 time=125 ms
65515 bytes from 192.168.0.1: icmp_seq=954 ttl=255 time=115 ms
65515 bytes from 192.168.0.1: icmp_seq=955 ttl=255 time=168 ms
65515 bytes from 192.168.0.1: icmp_seq=956 ttl=255 time=117 ms
65515 bytes from 192.168.0.1: icmp_seq=957 ttl=255 time=122 ms
65515 bytes from 192.168.0.1: icmp_seq=958 ttl=255 time=115 ms
65515 bytes from 192.168.0.1: icmp_seq=959 ttl=255 time=126 ms
65515 bytes from 192.168.0.1: icmp_seq=964 ttl=255 time=126 ms


用strace跟蹤發(fā)現(xiàn)，掉包數(shù)正好跟下面這個(gè)信息數(shù)吻合，網(wǎng)上查了下，有說(shuō)tcp發(fā)送接收緩沖參數(shù)設(shè)置問(wèn)題的。
recvmsg(3, 0x7ffe371089c0, 0)           = -1 EAGAIN (Resource temporarily unavailable)
我已經(jīng)設(shè)置了這些參數(shù)，但是還是掉包
net.core.rmem_default = 262144
net.core.rmem_max = 4194304
net.core.wmem_default = 262144
net.core.wmem_max = 1048576
net.ipv4.tcp_rmem = 4096 87380 4194304
net.ipv4.tcp_wmem = 4096 16384 4194304


2、用windows環(huán)境ping這個(gè)網(wǎng)關(guān)就沒(méi)有掉包現(xiàn)象。

MrQing

ping -s 56 192.168.0.1

running_life

56是不是就是64byte的包，這個(gè)試過(guò)了，小包也掉；我們準(zhǔn)備重啟或者更換交換機(jī)試試，用一個(gè)小的交換機(jī)試過(guò)了，直接ping不掉回復(fù) 2# MrQing

MrQing

回復(fù) 3# running_life


關(guān)注一下丟包時(shí)，交換機(jī)背板帶寬/包轉(zhuǎn)發(fā)率 呢？ 是不是包轉(zhuǎn)發(fā)率到上限了？