Date: Fri, 10 Mar 2006 07:48:06 -0500 From: John Baldwin <jhb@freebsd.org> To: Yar Tikhiy <yar@comp.chem.msu.su> Cc: cvs-src@freebsd.org, src-committers@freebsd.org, cvs-all@freebsd.org Subject: Re: cvs commit: src/sys/i386/i386 mpapic.c Message-ID: <200603100748.08275.jhb@freebsd.org> In-Reply-To: <20060310102001.GX4474@comp.chem.msu.su> References: <200603091623.k29GNFf9003993@repoman.freebsd.org> <20060310102001.GX4474@comp.chem.msu.su>
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On Friday 10 March 2006 05:20 am, Yar Tikhiy wrote: > On Thu, Mar 09, 2006 at 04:23:15PM +0000, John Baldwin wrote: > > jhb 2006-03-09 16:23:15 UTC > > > > FreeBSD src repository > > > > Modified files: (Branch: RELENG_4) > > sys/i386/i386 mpapic.c > > Log: > > Revert the previous change. Even though Intel insists that the > > behavior this change restores is wrong, it turns out the "proper" method > > is worse in practice for existing machines. This is probably due to the > > fact that using fixed priority with a physical broadcast destination > > effectively broadcasts interrupts to all CPUs. Fixing that would requi= re > > a lot more work than just restoring the previous "incorrect" behavior a= nd > > would probably be riskier as well. > > > > PR: kern/94160 > > Reported by: Richard Wiwatowski rjwiwat at internode dot on dot net > > > > Revision Changes Path > > 1.37.2.9 +3 -3 src/sys/i386/i386/mpapic.c > > This problem cannot affect a kernel unless it has been built > with "options SMP", can it? Thanks! Correct. Strictly speaking it's under options APIC_IO, but on 4.x those two options are basically tied together. =2D-=20 John Baldwin <jhb@FreeBSD.org> =A0<>< =A0http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" =A0=3D =A0http://www.FreeBSD.org
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