> With two computers connected via Ethernet through a switch, I would > normally get ping timings of around 250 microseconds. > However, when the computer being pinged was pegged at 100% CPU on all > cores, _ping latency would drop to about 170 microseconds._
This is probably caused by power management. Depending on the CPU, C3 wake latency can be >35us, C6 wake latency >100us. You should try to disable these C-states in the BIOS or kernel: https://access.redhat.com/articles/65410 http://www.breakage.org/2012/11/14/processor-max_cstate-intel_idle-max_cstate-and-devcpu_dma_latency/ -- tor-talk mailing list - [email protected] To unsubscribe or change other settings go to https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-talk
