On Mon, 7 Nov 2005, John Baldwin wrote: > And even then it can't be used for any device interrupts since there aren't > any I/O APICs. On a UP machine without I/O APICs, it's actually probably > more optimal to just use irq0 and irq8 for clocks rather than the lapic timer > anyway. The only real possible gain is the ability to use the profiling > interrupt from the local APIC. I got access to the BIOS of the Pentium 3 machine I am using, but it has no option to enable/disable the local APIC. Joseph Koshy is right, Linux enables the local APIC timer while booting up. I got the following in the bootup log of Linux 2.4 kernel on the same machine. ------------------------- Local APIC disabled by BIOS -- reenabling. Found and enabled local APIC! Using local APIC timer interrupts. calibrating APIC timer ... ------------------------- Though there is no I/O apic in the UP machines, but I only wanted to use local APIC timer in the lapic_timer_oneshot() mode to schedule few timers accurately. thanks vaibhaveReceived on Tue Nov 08 2005 - 00:38:02 UTC
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