Re: _ping_more / dropping pings

[email protected] wrote:
> or perhaps somewhere in between:  perhaps there is an OS buffer which
> holds the ICMP Echo Reply frames and unless POE pulls them out of the
> buffer fast enough, the buffer will overflow and POE won't see those
> responses
>
>   
This is almost certainly the issue.


> i notice that sometimes i can get away with several hundred
> outstanding pings at once; sometimes, not much more than thirty.  i
> generally run with a ceiling of twenty (20).  the variability depends
> on load on my box?  i don't know
>   
I believe it'll be related to MTU and the amount of other network 
traffic occurring at the moment the pings are sent.

> this isn't a problem  -- the total time it takes to ping the ~350
> addresses i'm using as my test bed right now doesn't change,
> regardless of the size of my 'ping heap'
>
> but i'm curious.  would anyone know where the overflowing buffer
> lives?  if in the OS, how would i look to see its size?  of inside
> POE, again, how would i identify its size?
>
>   
It'll be controlled by something in /proc/sys/net/ipv4/icmp*, I think......

Good luck,

Rob