ping delay, initial request

[Roman Kurakin]

Giorgos Keramidas wrote:

>On 2005-07-12 16:38, Roman Kurakin <rik at cronyx.ru> wrote:
>  
>
>>Hi,
>>
>>   I am starting to investigate some net problem and I wonder if this
>>problem seen/known.
>>   The problem was observed with ce(4) (Cronyx Tau32-PCI/Lite,
>>it is not in the tree yet, but similar to cp(4)/ctau(4) devices) and 
>>sppp(4).
>>If you run usual ping you will see normal delay which is much less than 
>>1sec.
>>But if you run flood ping, stop it, and run normal ping again you'll see 
>>delay
>>about one sec.
>>
>>ping x.x.x.x
>>delay << 1 sec
>>ping -f x.x.x.x
>>average delay << 1 sec
>>ping x.x.x.x
>>delay ~ 1 sec
>>
>>This was seen on FreeBSD 4.11 stable.
>>
>>Any ideas? Does any body observed such behaviour in other environment?
>>    
>>
>
>Is it possible that flood ping hits an icmp rate-limiting watermark and
>then every subsequent icmp packet gets penalized with a delay until a
>fair amount of time passes?
>  
>
Wasn't observed on ethernet iface. But this is good idea to test delay 
by some other type
of packets. Do you know any good ans simple tool for that?

rik

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