Date: Thu, 09 Mar 2000 17:26:00 -0800 From: Mike Smith <msmith@freebsd.org> To: Mohit Aron <aron@cs.rice.edu> Cc: freebsd-smp@freebsd.org Subject: Re: enabling APIC without SMP Message-ID: <200003100126.RAA01891@mass.cdrom.com> In-Reply-To: Your message of "Wed, 08 Mar 2000 18:15:21 CST." <200003090015.SAA04483@cs.rice.edu>
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I don't believe that anyone has actually done any work on this, sorry. > 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-smp" in the body of the message > -- \\ Give a man a fish, and you feed him for a day. \\ Mike Smith \\ Tell him he should learn how to fish himself, \\ msmith@freebsd.org \\ and he'll hate you for a lifetime. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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