Messages in this thread | | | Subject | Re: How does 2.6 SMP scheduler assign runqueues to multi-cores? | From | Nick Piggin <> | Date | Thu, 09 Jun 2005 17:03:04 +1000 |
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On Thu, 2005-06-09 at 06:32 +0000, helen monte wrote: > > > > > By the way, in an SMT/hyperthreading processor, does the latest > >kernel > > > > > version assign one run queue per physical CPU, or per virtual > >processor? > > > > > > > > > one run-queue per physical CPU > > > > > > No. Each logical processor has its own runqueue. > > How about muti-core? Does each core also have its own run queue? Does > anyone know how multi-core would work with SMT? Is it possible that they > work together? Is the following a possible scenario? : A node has two > processors, each processor has two cores, and each core has two "virtual > cores". And there are 8 run queues in total. >
It is always one runqueue per virtual CPU, so dual core has 2 runqueues, and dual core with SMT has 4 runqueues.
IBM and I believe Intel have chips that support SMT and have 2 cores.
-- SUSE Labs, Novell Inc.
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