Kevin Day wrote: > On Mar 6, 2010, at 12:05 AM, Daniel O'Connor wrote: > Yeah, sorry for not mentioning that I had tried this and didn't see any > change, so I thought I was on the wrong track. > > # sysctl hw.acpi.cpu.cx_lowest=C3 > hw.acpi.cpu.cx_lowest: C1 -> C3 > > but it doesn't look like it's ever leaving C1: > > hw.acpi.cpu.cx_lowest: C3 > dev.cpu.0.cx_supported: C1/3 C2/205 C3/245 > dev.cpu.0.cx_lowest: C3 > dev.cpu.0.cx_usage: 100.00% 0.00% 0.00% last 500us
You have too high interrupt rate for the C-states entering latencies reported by your ACPI. You should significantly reduce number of interrupts per core. For example, by setting: kern.hz=100 hint.apic.0.clock=0 hint.atrtc.0.clock=0 -- Alexander Motin _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
