A week or so ago I noticed that the 2.11BSD system that controls the lighting in my home had an uptime of almost a full year. <\/p>\n\n\n\n
Ever since I added the DEUNA to PDP2011 end of 2012, I’ve had at least one 2.11BSD system running, and a couple of times I almost reached an uptime of a year – but every time just before the magical date something happened. Most often the power failed – from accidentally flipping the switch while cleaning, to an explosion in the transformer down the street that left 10.000 homes without power (no, that one wasn’t my fault). And the latest, just over a year ago when I was going to charge some batteries in my garage and the extension cord caused the RCD to trip. No wonder – it is the cord I use for gardening, and there are lots of suspicious looking patches of gaffer tape on it… hey, why fix something that works most of the time. Anyway this time around I was a bit more careful, and no last minute surprises from the power company either. <\/p>\n\n\n\n
Here it is.<\/p>\n\n\n\n
[sytse@i5 ~]$ telnet de0\nTrying 10.1.0.4...\nConnected to de0.\nEscape character is '^]'.\n\n\n2.11 BSD UNIX (de0.sytse.net)\n\nlogin: root\nerase, kill ^U, intr ^C\n# uptime\n 8:04pm up 367 days, 7:18, 2 users, load averages: 0.40, 0.24, 0.02\n\n# sysctl kern.boottime\nkern.boottime = Fri Apr 5 12:46:44 2024\n\n# head -1 VERSION\nCurrent Patch Level: 447\n\n# uname -a\nBSD de0.sytse.net 2.11 2.11 BSD UNIX #6: Mon Mar 11 00:14:01 CET 2019 root@de0.sytse.net:\/usr\/src\/sys\/PDP2011 pdp11\n\n# ps ax\n PID TTY TIME COMMAND\n 0 ? 3:02 swapper\n 1 ? 0:06 (init)\n 44 ? 15:35 syslogd \n 54 ? 162:33 update \n 58 ? 2:47 acctd \n 66 ? 0:03 \/usr\/sbin\/inetd \n 70 ? 0:18 rwhod \n 74 ? 0:00 \/usr\/sbin\/lpd \n 91 ? 3:16 \/usr\/sbin\/sendmail -bd -q1h \n 98 ? 9:31 ntpd \n 8390 ? 6:31 cron \n 102 co 0:01 -sh \n 103 l1 0:00 - std.9600 ttyl1 (getty)\n 17367 p0 0:00 telnetd \n 17368 p0 0:01 -sh \n 17374 p0 0:00 ps ax \n\n# df\nFilesystem 1K-blocks Used Avail Capacity Mounted on\n\/dev\/xp0a 7816 3426 4390 44% \/\n\/dev\/xp0g 151625 88639 62986 58% \/usr\n\n# netstat -in\nName Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll\nde0 1500 10.1 10.1.0.4 8691809 0 1603254 0 0\nlo0 1536 127 127.0.0.1 14 0 14 0 0\n\n# netstat -s\nip:\n 6858158 total packets received\n 0 bad header checksums\n 0 with size smaller than minimum\n 0 with data size < data length\n 0 with header length < data size\n 0 with data length < header length\n 0 fragments received\n 0 fragments dropped (dup or out of space)\n 0 fragments dropped after timeout\n 4665 packets forwarded\n 0 packets not forwardable\n 0 redirects sent\nicmp:\n 0 calls to icmp_error\n 0 errors not generated 'cuz old message was icmp\n Output histogram:\n echo reply: 6\n 0 messages with bad code fields\n 0 messages < minimum length\n 0 bad checksums\n 0 messages with bad length\n Input histogram:\n echo reply: 6\n destination unreachable: 1\n echo: 6\n 6 message responses generated\ntcp:\n 399904 packets sent\n 339516 data packets (309499436 bytes)\n 6 data packets (4104 bytes) retransmitted\n 31279 ack-only packets (3878 delayed)\n 0 URG only packets\n 1 window probe packets\n 1563 window update packets\n 27539 control packets\n 248423 packets received\n 203445 acks (for 309512554 bytes)\n 2026 duplicate acks\n 0 acks for unsent data\n 50790 packets (9462678 bytes) received in-sequence\n 68 completely duplicate packets (534 bytes)\n 1 packets with some dup. data (1 bytes duped)\n 109 out-of-order packets (0 bytes)\n 0 packets (0 bytes) of data after window\n 0 window probes\n 0 window update packets\n 0 packets received after close\n 0 discarded for bad checksums\n 0 discarded for bad header offset fields\n 0 discarded because packet too short\n 13552 connection requests\n 115 connection accepts\n 13667 connections established (including accepts)\n 13676 connections closed (including 0 drops)\n 10 embryonic connections dropped\n 127813 segment updated rtt (of 141693 attempts)\n 325 retransmit timeouts\n 0 connections dropped by rexmit timeout\n 0 persist timeouts\n 2 keepalive timeouts\n 2 keepalive probes sent\n 0 connections dropped by keepalive\nudp:\n 0 incomplete headers\n 0 bad data length fields\n 0 bad checksums\n 6077017 no ports\n 6077017 (arrived as bcast) no ports\n<\/code><\/pre>\n\n\n\n<\/p>\n","protected":false},"excerpt":{"rendered":"
A week or so ago I noticed that the 2.11BSD system that controls the lighting in my home had an uptime of almost a full year. Ever since I added the DEUNA to PDP2011 end of 2012, I’ve had at least one 2.11BSD system running, and a couple of times I almost reached an uptime […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-1504","post","type-post","status-publish","format-standard","hentry","category-pdp11","missing-thumbnail"],"_links":{"self":[{"href":"https:\/\/pdp2011.sytse.net\/wordpress\/wp-json\/wp\/v2\/posts\/1504","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdp2011.sytse.net\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pdp2011.sytse.net\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pdp2011.sytse.net\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/pdp2011.sytse.net\/wordpress\/wp-json\/wp\/v2\/comments?post=1504"}],"version-history":[{"count":2,"href":"https:\/\/pdp2011.sytse.net\/wordpress\/wp-json\/wp\/v2\/posts\/1504\/revisions"}],"predecessor-version":[{"id":1506,"href":"https:\/\/pdp2011.sytse.net\/wordpress\/wp-json\/wp\/v2\/posts\/1504\/revisions\/1506"}],"wp:attachment":[{"href":"https:\/\/pdp2011.sytse.net\/wordpress\/wp-json\/wp\/v2\/media?parent=1504"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pdp2011.sytse.net\/wordpress\/wp-json\/wp\/v2\/categories?post=1504"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pdp2011.sytse.net\/wordpress\/wp-json\/wp\/v2\/tags?post=1504"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}