Date: Tue, 8 Jan 2013 15:12:38 -0800 (PST) From: Barney Cordoba <barney_cordoba@yahoo.com> To: Ian Smith <smithi@nimnet.asn.au> Cc: freebsd-net@freebsd.org Subject: Re: To SMP or not to SMP Message-ID: <1357686758.66466.YahooMailClassic@web121604.mail.ne1.yahoo.com> In-Reply-To: <20130109032940.H30575@sola.nimnet.asn.au>
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--- On Tue, 1/8/13, Ian Smith <smithi@nimnet.asn.au> wrote: > From: Ian Smith <smithi@nimnet.asn.au> > Subject: Re: To SMP or not to SMP > To: "Garrett Cooper" <yanegomi@gmail.com> > Cc: "Barney Cordoba" <barney_cordoba@yahoo.com>, "Erich Dollansky" <erich= sfreebsdlist@alogt.com>, freebsd-net@freebsd.org > Date: Tuesday, January 8, 2013, 11:34 AM > On Tue, 8 Jan 2013 07:57:04 -0800, > Garrett Cooper wrote: > > On Jan 8, 2013, at 7:50 AM, Barney Cordoba wrote: > >=20 > > > --- On Mon, 1/7/13, Erich Dollansky <erichsfreebsdlist@alogt.com> > wrote: > > >=20 > > >> From: Erich Dollansky <erichsfreebsdlist@alogt.com> > > >> Subject: Re: To SMP or not to SMP > > >> To: "Barney Cordoba" <barney_cordoba@yahoo.com> > > >> Cc: freebsd-net@freebsd.org > > >> Date: Monday, January 7, 2013, 10:56 PM > > >> Hi, > > >>=20 > > >> On Mon, 7 Jan 2013 18:25:58 -0800 (PST) > > >> Barney Cordoba <barney_cordoba@yahoo.com> > > >> wrote: > > >>=20 > > >>> I have a situation where I have to run > 9.1 on an old > > >> single core box. > > >>> Does anyone have a handle on whether it's > better to > > >> build a non SMP > > >>> kernel or to just use a standard SMP > build with just > > >> the one core? > > >>> Thanks. > > >>=20 > > >> I ran a single CPU version of FreeBSD until > my last single > > >> CPU got hit > > >> by a lightning last April or May without any > problems. > > >>=20 > > >> I never saw a reason to include the overhead > of SMP for this > > >> kind of > > >> machine and I also never ran into problems > with this. > > >=20 > > > Another "ass"umption based on logic rather than > empirical evidence. > >=20 > > =A0=A0=A0 It isn't really an offhanded > assumption because there _is_=20 > > additional overhead added into the kernel structures > to make things=20 > > work SMP with locking :). Whether or not it's > measurable for you and=20 > > your applications, I have no idea. > > HTH, > > -Garrett >=20 > Where's Kris Kennaway when you need something compared, > benchmarked=20 > under N different types of loads, and nicely graphed?=A0 > Do we have a=20 > contender? :) >=20 > cheers, Ian I don't need no stinking graphs. I'll do some testing. bc
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