Hi Aaron, Linux ping resolves to 1 microsecond, but the version of fping I am using with smokeping rounds off to 10 microseconds.
As to accuracy and precision, I am sure each individual measurement is quite accurate, but I would be wary about attaching too much meaning to the absolute value - just look for changes. As examples, 4 machines on a LAN (when everything is quiet): median and approximate 5th and 95th percentiles. Server 1: Server 2003: 160us (140-200) Server 2: Server 2003: 300us (200-400) Server 3: SBS 2003: 300us (200-400) Linux server: 330us (310-370) All windows servers are similar spec with the same NIC. Server 2 is a bit slower but 1 and 3 are virtually identical hardware. Prompted by this strange variation, I checked settings and discovered it was purely the driver versions. Whether this will make a scrap of difference in real life - who knows? Cameron. Aaron Lewis wrote: > Before I dig into setting up smokeping, I would like to ask if I can > monitor very small latency numbers--sub millisecond? All nodes are in > a single building LAN. I need to monitor latency over time to track a > baseline, compare changes, etc. Everything I've looked at on Windows > (What's Up Gold, IPCheck) won't measure smaller than 1 ms. Is this > because the built in PING in windows doesn't resolve lower than 1 ms? > I notice in any Linux distro, PING gives me numbers like 0.255 ms > which is great. So will smokeping work at this level? _______________________________________________ smokeping-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/smokeping-users
