We're monitoring 1420 IPs in hobbit, and it takes fping ~40 seconds to go through them all:
<snip> [root at hobbit fping]# fping -i5 -b12 -f ips -r1 -t250 -B2 -q -s 1430 targets 1419 alive 11 unreachable 0 unknown addresses
55 timeouts (waiting for response)
1474 ICMP Echos sent
1420 ICMP Echo Replies received
0 other ICMP received0.05 ms (min round trip time) 5.83 ms (avg round trip time) 281 ms (max round trip time) 40.704 sec (elapsed real time) </snip>
Now, this seems a bit lengthy to me. I mean, if the avg round trip time is 5.83 ms, and there are 1430 hosts, should the total time in transit for all hosts should be 8336ms, or 8 seconds... right? Even when I remove the hosts that aren't responding, the results on are par with those above.
Our polling interval is once every 60 seconds (which we want to maintain, because we like to know ASAP when something drops even one ping), so it's not a problem yet. We add hosts on a daily basis, however, so it will be a problem some time in the future and I'd like to fix it before it becomes a problem.
This machine is a dual 3GHz Xeon /w 6GB of memory, running Fedora Core 5. I've flipped every bit in the kernel parameters that I dare via sysctl, with little to no effect on the poll time. Does anybody out there have any recommendations on a way to speed this up?
Regards, -Eric Schwimmer Network Engineer UVA HSCS Network Engineering