Date: Wed, 8 Mar 2000 10:40:10 -0800 (PST) From: Matthew Jacob <mjacob@feral.com> To: Mohit Aron <aron@cs.rice.edu> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: enabling APIC without SMP Message-ID: <Pine.BSF.4.05.10003081039580.78286-100000@semuta.feral.com> In-Reply-To: <200003081829.MAA14589@cs.rice.edu>
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I'll second this request. > 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-hackers" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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