I've delayed trying to send this, as I wasn't clear on how to express it -- and I had hoped that the problem would "go away" before I figured that part out: I first observed it around 09 Nov, which is when I updated the laptop (via in-place source upgrade, as usual) from r367484 to r367517. One of the issues I faced with respect to expressing the nature of the problem was "how to quantify" it. And as I was trying to get some work done on another machine, it ocurred to me that perhaps pinging that other machine might illustrate things adequately, so: g1-48(13.0-C)[17] ping albert PING albert.catwhisker.org (172.16.8.13): 56 data bytes 64 bytes from 172.16.8.13: icmp_seq=0 ttl=63 time=0.511 ms 64 bytes from 172.16.8.13: icmp_seq=1 ttl=63 time=0.667 ms 64 bytes from 172.16.8.13: icmp_seq=2 ttl=63 time=0.537 ms 64 bytes from 172.16.8.13: icmp_seq=3 ttl=63 time=0.618 ms 64 bytes from 172.16.8.13: icmp_seq=4 ttl=63 time=0.647 ms 64 bytes from 172.16.8.13: icmp_seq=5 ttl=63 time=0.538 ms 64 bytes from 172.16.8.13: icmp_seq=6 ttl=63 time=0.538 ms 64 bytes from 172.16.8.13: icmp_seq=7 ttl=63 time=0.543 ms 64 bytes from 172.16.8.13: icmp_seq=8 ttl=63 time=0.571 ms 64 bytes from 172.16.8.13: icmp_seq=9 ttl=63 time=0.500 ms 64 bytes from 172.16.8.13: icmp_seq=10 ttl=63 time=0.618 ms 64 bytes from 172.16.8.13: icmp_seq=11 ttl=63 time=0.548 ms 64 bytes from 172.16.8.13: icmp_seq=12 ttl=63 time=0.532 ms 64 bytes from 172.16.8.13: icmp_seq=13 ttl=63 time=0.532 ms 64 bytes from 172.16.8.13: icmp_seq=14 ttl=63 time=0.613 ms 64 bytes from 172.16.8.13: icmp_seq=15 ttl=63 time=0.593 ms 64 bytes from 172.16.8.13: icmp_seq=16 ttl=63 time=0.501 ms 64 bytes from 172.16.8.13: icmp_seq=17 ttl=63 time=0.630 ms 64 bytes from 172.16.8.13: icmp_seq=18 ttl=63 time=0.556 ms 64 bytes from 172.16.8.13: icmp_seq=19 ttl=63 time=0.566 ms 64 bytes from 172.16.8.13: icmp_seq=20 ttl=63 time=0.642 ms 64 bytes from 172.16.8.13: icmp_seq=21 ttl=63 time=0.611 ms 64 bytes from 172.16.8.13: icmp_seq=22 ttl=63 time=0.628 ms 64 bytes from 172.16.8.13: icmp_seq=23 ttl=63 time=92.473 ms 64 bytes from 172.16.8.13: icmp_seq=24 ttl=63 time=0.647 ms 64 bytes from 172.16.8.13: icmp_seq=25 ttl=63 time=0.483 ms 64 bytes from 172.16.8.13: icmp_seq=26 ttl=63 time=0.476 ms 64 bytes from 172.16.8.13: icmp_seq=27 ttl=63 time=0.561 ms 64 bytes from 172.16.8.13: icmp_seq=28 ttl=63 time=0.560 ms 64 bytes from 172.16.8.13: icmp_seq=29 ttl=63 time=0.599 ms 64 bytes from 172.16.8.13: icmp_seq=30 ttl=63 time=0.677 ms 64 bytes from 172.16.8.13: icmp_seq=31 ttl=63 time=0.563 ms 64 bytes from 172.16.8.13: icmp_seq=32 ttl=63 time=0.609 ms 64 bytes from 172.16.8.13: icmp_seq=33 ttl=63 time=0.558 ms 64 bytes from 172.16.8.13: icmp_seq=34 ttl=63 time=0.527 ms 64 bytes from 172.16.8.13: icmp_seq=35 ttl=63 time=0.610 ms 64 bytes from 172.16.8.13: icmp_seq=36 ttl=63 time=0.621 ms 64 bytes from 172.16.8.13: icmp_seq=37 ttl=63 time=0.501 ms 64 bytes from 172.16.8.13: icmp_seq=38 ttl=63 time=68482.244 ms 64 bytes from 172.16.8.13: icmp_seq=39 ttl=63 time=0.672 ms 64 bytes from 172.16.8.13: icmp_seq=40 ttl=63 time=0.635 ms 64 bytes from 172.16.8.13: icmp_seq=41 ttl=63 time=0.585 ms 64 bytes from 172.16.8.13: icmp_seq=42 ttl=63 time=0.629 ms 64 bytes from 172.16.8.13: icmp_seq=43 ttl=63 time=0.566 ms 64 bytes from 172.16.8.13: icmp_seq=44 ttl=63 time=0.641 ms 64 bytes from 172.16.8.13: icmp_seq=45 ttl=63 time=0.638 ms 64 bytes from 172.16.8.13: icmp_seq=46 ttl=63 time=0.645 ms 64 bytes from 172.16.8.13: icmp_seq=47 ttl=63 time=0.540 ms 64 bytes from 172.16.8.13: icmp_seq=48 ttl=63 time=0.487 ms 64 bytes from 172.16.8.13: icmp_seq=49 ttl=63 time=13.063 ms 64 bytes from 172.16.8.13: icmp_seq=50 ttl=63 time=0.567 ms 64 bytes from 172.16.8.13: icmp_seq=51 ttl=63 time=0.487 ms 64 bytes from 172.16.8.13: icmp_seq=52 ttl=63 time=0.428 ms 64 bytes from 172.16.8.13: icmp_seq=53 ttl=63 time=0.692 ms 64 bytes from 172.16.8.13: icmp_seq=54 ttl=63 time=0.605 ms 64 bytes from 172.16.8.13: icmp_seq=55 ttl=63 time=0.630 ms 64 bytes from 172.16.8.13: icmp_seq=56 ttl=63 time=0.561 ms 64 bytes from 172.16.8.13: icmp_seq=57 ttl=63 time=0.634 ms 64 bytes from 172.16.8.13: icmp_seq=58 ttl=63 time=0.571 ms 64 bytes from 172.16.8.13: icmp_seq=59 ttl=63 time=0.577 ms 64 bytes from 172.16.8.13: icmp_seq=60 ttl=63 time=0.592 ms 64 bytes from 172.16.8.13: icmp_seq=61 ttl=63 time=0.455 ms 64 bytes from 172.16.8.13: icmp_seq=62 ttl=63 time=0.585 ms 64 bytes from 172.16.8.13: icmp_seq=63 ttl=63 time=0.548 ms 64 bytes from 172.16.8.13: icmp_seq=64 ttl=63 time=0.443 ms 64 bytes from 172.16.8.13: icmp_seq=65 ttl=63 time=0.584 ms 64 bytes from 172.16.8.13: icmp_seq=66 ttl=63 time=0.592 ms ^C --- albert.catwhisker.org ping statistics --- 67 packets transmitted, 67 packets received, 0.0% packet loss round-trip min/avg/max/stddev = 0.428/1024.248/68482.244/8303.513 ms g1-48(13.0-C)[18] Please note that no packets are dropped, and that most exhibit an RTT of around 0.6 ms, and that no packets are dropped -- which is ... good, as far as that goes. (The laptop is presently using a wired Ethernet (em0) link, as "wireless" doesn't play well with significant lags in response time, or so it appears to me.) But packet 23 shows a hint of something gone awry, and packet 38 ... something's gone walkabout, and is in no hurry to return. While the above "ping" was done during the upgrade from r368097 to r368119, I have observed similar effects when the machine was idle (but running head). I do NOT observe these effects when the machine is running stable/12 (also tracked/updated daily), nor have I seen the behavior on other machines (my build machine, which also tracks head and stable/12 daily; various machines at work, which generally track head about every 4 - 5 weeks). Any ideas for tracking this down? I have documented various aspects of what process I use to track/uodate the machines, the environment, and the history of the tracking: * http://www.catwhisker.org/~david/FreeBSD/upgrade.html * http://www.catwhisker.org/~david/FreeBSD/history/ Thanks! Peace, david -- David H. Wolfskill david_at_catwhisker.org "Make America Great Again," he said -- and THIS is what he did??!? See http://www.catwhisker.org/~david/publickey.gpg for my public key.
This archive was generated by hypermail 2.4.0 : Wed May 19 2021 - 11:41:26 UTC