On Tue, 22 May 2012 17:28:47 -0700 Hal Murray <hmur...@megapathdsl.net> wrote:
> Note that 4 samples are way off scale. The target machine is idle, but the > packets are going over a wifi link that has other traffic but is far from > overloaded. Yes, this is wifi rather than a simple ethernet switch. > > I suspect I could make similar problems with a pair of ethernet switches. On an ethernet it looks quite different: 64 bytes from kaos.kinali.ch (82.197.186.49): icmp_req=164 ttl=64 time=0.189 ms 64 bytes from kaos.kinali.ch (82.197.186.49): icmp_req=165 ttl=64 time=0.182 ms 64 bytes from kaos.kinali.ch (82.197.186.49): icmp_req=166 ttl=64 time=0.189 ms 64 bytes from kaos.kinali.ch (82.197.186.49): icmp_req=167 ttl=64 time=0.188 ms 64 bytes from kaos.kinali.ch (82.197.186.49): icmp_req=168 ttl=64 time=0.196 ms 64 bytes from kaos.kinali.ch (82.197.186.49): icmp_req=169 ttl=64 time=0.182 ms 64 bytes from kaos.kinali.ch (82.197.186.49): icmp_req=170 ttl=64 time=0.191 ms 64 bytes from kaos.kinali.ch (82.197.186.49): icmp_req=171 ttl=64 time=0.194 ms 64 bytes from kaos.kinali.ch (82.197.186.49): icmp_req=172 ttl=64 time=0.185 ms 64 bytes from kaos.kinali.ch (82.197.186.49): icmp_req=173 ttl=64 time=0.172 ms 64 bytes from kaos.kinali.ch (82.197.186.49): icmp_req=174 ttl=64 time=0.177 ms 64 bytes from kaos.kinali.ch (82.197.186.49): icmp_req=175 ttl=64 time=0.186 ms 64 bytes from kaos.kinali.ch (82.197.186.49): icmp_req=176 ttl=64 time=0.186 ms 64 bytes from kaos.kinali.ch (82.197.186.49): icmp_req=177 ttl=64 time=0.190 ms 64 bytes from kaos.kinali.ch (82.197.186.49): icmp_req=178 ttl=64 time=0.189 ms 64 bytes from kaos.kinali.ch (82.197.186.49): icmp_req=179 ttl=64 time=0.203 ms Network is a destkop - switch1 - switch2 - ntp box. The switches are two Level1 Gbit smart switches. The desktop is a ~4y old Xeon 2GHz system with a Gbit interface The ntp box is a AMD Geode LX 500MHz system with a 100MBit interface Both running linux. There aren't noticable more jitter for moderate (1-2 MByte/s) traffic. (Probably visible if i would do a statistical analysis...but..) Attila Kinali -- Why does it take years to find the answers to the questions one should have asked long ago? _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.