From mboxrd@z Thu Jan 1 00:00:00 1970 From: riel@surriel.com (Rik van Riel) Date: Mon, 20 Jul 2015 17:04:15 -0400 Subject: How to understand "processor" in "SMP" and "UP"? In-Reply-To: References: Message-ID: <55AD624F.808@surriel.com> To: kernelnewbies@lists.kernelnewbies.org List-Id: kernelnewbies.lists.kernelnewbies.org On 07/19/2015 11:43 PM, Nan Xiao wrote: > Hi all, > > Per my understanding, the "processor" in "SMP" and "UP" should be a > "logic CPU", not a "physical CPU". > If the "physical CPU" contains 2 "cores", and every "core" contains 2 > "hardware threads", then the "processor" > should stands for "hardware thread". > > Is my understanding right? Thanks very much in advance! Yes, you are absolutely right, when speaking from a software point of view. Each logical processor shows up as a CPU in Linux. Of course, if you were to talk to somebody installing physical CPUs in systems, you would get a different answer :) -- All rights reversed.