latency spike up need help

thang wrote: Thanks all for help guys,

Today i found out in BIOS there is a "SMI lock" in chipset section. After enabled it latency seem work ok.The smictl maybe doesnt work in this PC. I will try more test to confirm it.

[strike]After reseting PC, latency spike up again[/strike]

Exactly the latency is still ok when i run latency-test, but when i run linuxcnc that has classicladder ( using modbus as slave) i got "Unexpected realtime delay" even my servo thread is 500us, classicladder's thread is 10ms and didnt connect to master yet.

It happened not right away and only in this PC, do you think what can cause this problem?