Date: Wed, 8 Mar 2000 12:29:35 -0600 (CST) From: Mohit Aron <aron@cs.rice.edu> To: freebsd-current@freebsd.org, freebsd-hackers@freebsd.org Subject: enabling APIC without SMP Message-ID: <200003081829.MAA14589@cs.rice.edu>
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Hi, I'm using a FreeBSD-current snapshot from 3rd January 2000. It seems that in order to enable APICs (option APIC_IO in kernel configuration file), one needs to also compile the kernel with SMP support (option SMP in kernel configuration file). While enabling the APIC is desirable even on a uniprocessor (provides more IRQs, interrupt ovhd becomes less, provides on-chip timer), enabling SMP support on a uniprocessor brings down the performance (I've noticed a degradation of 22% in performance of a webserver when a kernel was compiled with SMP support than without). Would it be possible to allow enabling the APIC without requiring support for SMP in future versions of FreeBSD ? Since I'm using a snapshot that's about two months old, I apologize if the above has already been addressed in the latest snapshots. - Mohit To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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