[FUG-BR] RES: ping localhost

[Cleber Alves Nascimento]

Em 6 de maio de 2010 16:25, Eduardo Schoedler
<eschoedler em viavale.com.br>escreveu:

> Renata Dias escreveu:
> > Alguém ja se deparou com essa anomalia:
> >
> > # ping -s1000 -c50 -i.1 127.0.0.1
> >
> > --- 127.0.0.1 ping statistics ---
> > 50 packets transmitted, 49 packets received, 2.0% packet loss
> > round-trip min/avg/max/stddev = 0.322/60.418/607.858/137.954 ms
>
>
> Aqui eu fiz o teste, o resultado foi normal inclusive no consumo de
> processador:
>
> ==> FreeBSD 6.1-RELEASE-p10
>
> # ping -s1000 -c50 -i.1 127.0.0.1
> PING 127.0.0.1 (127.0.0.1): 1000 data bytes
>
> --- 127.0.0.1 ping statistics ---
> 50 packets transmitted, 50 packets received, 0% packet loss
> round-trip min/avg/max/stddev = 0.026/0.043/0.103/0.015 ms
>
>
>
> ==> FreeBSD 7.2-STABLE
>
> # ping  -s1000 -c500 -i 0.01 127.0.0.1
>
> --- 127.0.0.1 ping statistics ---
> 500 packets transmitted, 500 packets received, 0.0% packet loss
> round-trip min/avg/max/stddev = 0.015/0.022/0.170/0.013 ms
>
>
>
> Porém fazendo o teste com flood, houve perda:
>
> ==> FreeBSD 6.1-RELEASE-p10
>
> # ping -f -s1000 -c5000 127.0.0.1
>
> --- 127.0.0.1 ping statistics ---
> 5000 packets transmitted, 3483 packets received, 30% packet loss
> round-trip min/avg/max/stddev = 0.019/0.032/0.680/0.042 ms
>
>
> ==> FreeBSD 7.2-STABLE
>
> # ping  -s1000 -c5000 -f 127.0.0.1
> PING 127.0.0.1 (127.0.0.1): 1000 data bytes
>
> --- 127.0.0.1 ping statistics ---
> 5000 packets transmitted, 3480 packets received, 30.4% packet loss
> round-trip min/avg/max/stddev = 0.009/0.015/0.482/0.026 ms
>
> Mas mesmo com flood, o consumo do processador continuou normal.
>
>
> --
> Eduardo Schoedler
>
> -------------------------
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>

Eu penso que nesse de flood ping existe a proteção do proprio freebsd:

# tail -f /var/log/messages
...
Limiting icmp ping response from 290 to 200 packets/sec
...

Já no caso da Renata, muito provavelmente ta faltando algum tuning, mas
ainda assim é preciso fazer uma contraprova pra pegar mais detalhes.

Cleber
-- 
.ılı..ılı.
"Observe as estrelas e aprenda com elas." Albert Einstein