Date: Mon, 27 Dec 2004 14:52:40 -0500 From: John Baldwin <jhb@FreeBSD.org> To: freebsd-hackers@FreeBSD.org Cc: Kris Kennaway <kris@obsecurity.org> Subject: Re: HTT/SMP servers instability on 5.3-STABLE Message-ID: <200412271452.40348.jhb@FreeBSD.org> In-Reply-To: <20041210204824.GA53907@xor.obsecurity.org> References: <36627.194.210.13.66.1102679886.squirrel@194.210.13.66> <20041210204824.GA53907@xor.obsecurity.org>
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On Friday 10 December 2004 03:48 pm, Kris Kennaway wrote: > On Fri, Dec 10, 2004 at 05:58:06AM -0600, klr@6s-gaming.com wrote: > > I've heard it can penalize performance because the scheduler isn't > > optimized for logical CPUs. Does having HTT enabled impacts the > > stability of the system? > > No. Actually, for 5.3 it does. HEAD has the problem fixed, not sure about RELENG_5 yet, but due to the way IPIs are done in 5.3, having more than 2 CPUs can be very destabilizing, so disabling HTT on a 2-way system so that it goes from 4 CPUs to 2 CPUs can help stability very much. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org
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