[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
