smm_latency·11 ปีที่แล้ว·discussFrom my experience, it's very difficult to achieve low latency on modern Intel processors (after Sandy Bridge) because of SMI interrupts:https://en.wikipedia.org/wiki/System_Management_ModeSome of the SMI interrupts can be disabled by smictrl, but there usually remains an interrupt every 10-20 seconds with 100+ microsecond latency. See plot here:http://wiki.linuxcnc.org/cgi-bin/wiki.pl?FixingSMIIssuesSMI interrupts are used for fan / thermal region control and cannot be fully disabled.
https://en.wikipedia.org/wiki/System_Management_Mode
Some of the SMI interrupts can be disabled by smictrl, but there usually remains an interrupt every 10-20 seconds with 100+ microsecond latency. See plot here:
http://wiki.linuxcnc.org/cgi-bin/wiki.pl?FixingSMIIssues
SMI interrupts are used for fan / thermal region control and cannot be fully disabled.