Date: 16 Sep 2004 20:01:54 -0400 From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org> To: "adp" <dap99@i-55.com> Cc: questions@freebsd.org Subject: Re: SMP on SMP-capable system with one processor Message-ID: <44y8j9zrt9.fsf@be-well.ilk.org> In-Reply-To: <060501c49c18$ad4c3f60$6401a8c0@THEBOX> References: <060501c49c18$ad4c3f60$6401a8c0@THEBOX>
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"adp" <dap99@i-55.com> writes: > We have several Dell-based systems that are dual-processor capable, but have > only one processor. The FreeBSD 4.9 kernels for each system is compiled with > SMP support, even though there is only one processor on each system right > now. > > Would this actually reduce performance on a single processor system? I know > that SMP kernels have to worry about special locking, and may be doing > unnecessary work. Sure. If you don't have a multiprocessor system, you may see a very small performance improvement by removing the SMP support. You'd need to make careful measurements to notice the difference, though.
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