Mark, Thank you, Mark, for the link describing the Intel Enhanced Intel SpeedStep Technology. I noticed that they suggest for the kernel to poll each CPU at regular time intervals, asking about its utilization. Then, they plan to adjust the CPU frequency based on its utilization.
Do you guys think that the CPU frequency should be changed in response to changes in CPU utilization? If so, should we expect the CPU utilization to rise as the CPU frequency is decreased and vice versa? David Mark Haywood wrote: >> Yes, it does depend upon the chip. Intel claims to have much less >> latency than AMD with their newer chips, which is why they believe >> that changing P-states multiple times a second is optimal. I don't >> know the numbers off the top of my head though. > > > Actually, I lie. Off the top of my head I was pretty sure that Intel > was claiming 10 milliseconds and I just googled to confirm it: > > http://www.intel.com/cd/ids/developer/asmo-na/eng/195910.htm?page=4 > > I don't know about Opteron. I haven't measured it. I'm not sure it > matters, as I don't believe we'll implement P-state support for > Opteron. Greyhound though ... >
