Date: Tue, 9 Mar 2004 10:17:39 -0600 (CST) From: Justin Dossey <jbd@cagemonkey.com> To: Conrad Sabatier <conrads@cox.net> Cc: freebsd-current@freebsd.org Subject: Re: APIC/SMP on UP? (was Re: Load average with CURRENT) Message-ID: <Pine.LNX.4.58.0403091014330.3894@localhost.localdomain> In-Reply-To: <XFMail.20040309060611.conrads@cox.net> References: <XFMail.20040309060611.conrads@cox.net>
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On Tue, 9 Mar 2004, Conrad Sabatier wrote: > I've been meaning to ask about this. Is there anything to be gained on a UP > box by enabling APIC and/or SMP? I'm running on an Athlon here, with ULE: > > CPU: AMD Athlon(tm) Processor (998.07-MHz 686-class CPU) > Origin = "AuthenticAMD" Id = 0x622 Stepping = 2 Features=0x183f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR> > AMD Features=0xc0400000<AMIE,DSP,3DNow!> I'd say yes, there is. APIC reduces interrupt overhead and provides an on-chip timer. It also provides better interrupt sharing. -- Justin Dossey
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