Date: Fri, 2 Jan 2004 10:00:16 -0800 (PST) From: Tom <tom@sdf.com> To: Oliver Brandmueller <ob@e-Gitt.NET> Cc: freebsd-current@freebsd.org Subject: Re: Hot Swapping CPUs? Message-ID: <20040102095719.H665@light.sdf.com> In-Reply-To: <20040102160847.GD38779@e-Gitt.NET> References: <20040102160847.GD38779@e-Gitt.NET>
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On Fri, 2 Jan 2004, Oliver Brandmueller wrote: > Hi all, > > With late ULE you can watch a process hopping between CPUs. This seems You can see that with the 4BSD scheduler too. It has always been a "feature" on the scheduler. I can see this on FreeBSD 3.5 too. > to the base functionality for CPU hot swapping. One would need (apart > from a Motherboard that's able to that ;-)) some control over CPUs now, > like disabling a physical CPU during runtime (which could also be done > automatically on certain filure onditions). sysctl already exposes some variabled to control CPUs on an SMP system. It is a pretty hard to detect a CPU failure in software, because the software detection will fail at the same time the CPU does. > Is there any work in progress in this direction? Would be a very neat > feature for high availability systems. > > - Oliver Tom
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