paulgorman.org

< ^ txt

Mon Nov 21 07:52:29 EST 2016 Slept from ten-thirty to six-thirty. Woke briefly around two-thirty. Sunny and thirty-five today. Goals: Work: - Investigate firefly after-hours load issue Done. It was Windows guests on the same hypervisor taxing I/O with Windows backup. I'd like to try some sort of SSD caching layer (lvmcache or bcache?), but we'd have to upgrade from Wheezy. - Start year-end review and new year planning Done. - Call with Gary Schmittling from Bullseye at 1:30 Done. https://netbeez.net/2014/08/19/raspberry-pi-and-distributed-network-monitoring-iperf/ > You can test your pipes with a 10Mbps test. UDP also measures the jitter and the packet loss between the two ends. These two metrics are used by many network engineers as an early indication of network problems (e.g. run a 1Mbps UPD Iperf every 1 hour and raise an alarm when jitter goes beyond 15 milliseconds). Server agent: pi@172.30.0.20 :~:$ iperf -s -u [ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams [ 3] 0.0-10.0 sec 11.9 MBytes 10.0 Mbits/sec 0.059 ms 0/ 8504 (0%) [ 3] 0.0-10.0 sec 1 datagrams received out-of-orderClient agent: pi@172.30.0.11 :~:$ iperf -c 172.30.0.20 -u -b 10M [ 3] 0.0-10.0 sec 11.9 MBytes 10.0 Mbits/sec 0.058 ms 0/ 8504 (0%) [ 3] 0.0-10.0 sec 1 datagrams received out-of-order > If you want to test how your routers forward packets based on their type-of-service (TOS) marking you can use the option –tos. Server agent: pi@172.30.0.20 :~:$ iperf -s [ 4] 0.0-10.0 sec 89.9 MBytes 75.2 Mbits/secClient agent: pi@172.30.0.11 :~:$ iperf -c 172.30.0.20 –tos 96 [ 3] 0.0-10.0 sec 89.9 MBytes 75.2 Mbits/sec http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipsla/configuration/15-mt/sla-15-mt-book/sla_udp_jitter.html Thirty minute walk at lunch. Sunny and cold. A biting wind. A one-third moon ghostly and low in the western sky at noon. Home: - Make D&D character sheet No. Stopped on the way home to pick up some Thanksgiving stuff. Breakfast: carrots, spinach, yogurt, coffee with half-and-half Lunch: nuts, a doughnut, coffee Dinner: steak sandwich, fries

< ^ txt