Linux内核网络丢包查看工具dropwatch的安装和使用

第一个是 dropwatch

# dropwatch -lkas

Initializing kallsyms db

dropwatch> start

Enabling monitoring...

Kernel monitoring activated.

Issue Ctrl-C to stop monitoring

1 drops at icmp_rcv+11c (0xffffffff8193bb1c) [software]

1 drops at icmp_rcv+11c (0xffffffff8193bb1c) [software]

1 drops at icmp_rcv+11c (0xffffffff8193bb1c) [software]

1 drops at icmp_rcv+11c (0xffffffff8193bb1c) [software]

第二个是 perf 监视 kfree_skb 事件

shell> perf record -g -a -e skb:kfree_skb

shell> perf script

第三个是tcpdrop

Linux bcc/eBPF tcpdrop

第四个是systemtap脚本

/usr/share/doc/systemtap-1.6/examples/network/dropwatch.stp

#!/usr/bin/stap

############################################################

# Dropwatch.stp

# Author: Neil Horman <nhorman@redhat.com>

# An example script to mimic the behavior of the dropwatch utility

# http://fedorahosted.org/dropwatch

############################################################

# Array to hold the list of drop points we find

global locations

# Note when we turn the monitor on and off

probe begin { printf("Monitoring for dropped packets\n") }

probe end { printf("Stopping dropped packet monitor\n") }

# increment a drop counter for every location we drop at

probe kernel.trace("kfree_skb") { locations[$location] <<< 1 }

# Every 1 seconds report our drop locations

probe timer.sec(1)

{

printf("\n")

foreach (l in locations-) {

printf("%d packets dropped at %s\n",

@count(locations[l]), symname(l))

}

delete locations

}

五：tcpdump

Linux内核网络丢包查看工具dropwatch的安装和使用