Date: Wed, 9 Jan 2013 07:00:31 -0800 (PST) From: Barney Cordoba <barney_cordoba@yahoo.com> To: erichsfreebsdlist@alogt.com, sthaug@nethelp.no Cc: freebsd-net@freebsd.org, jack.vogel@gmail.com, atkin901@gmail.com Subject: Re: To SMP or not to SMP Message-ID: <1357743631.24911.YahooMailClassic@web121605.mail.ne1.yahoo.com> In-Reply-To: <20130109.153249.41633097.sthaug@nethelp.no>
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--- On Wed, 1/9/13, sthaug@nethelp.no <sthaug@nethelp.no> wrote: > From: sthaug@nethelp.no <sthaug@nethelp.no> > Subject: Re: To SMP or not to SMP > To: erichsfreebsdlist@alogt.com > Cc: barney_cordoba@yahoo.com, freebsd-net@freebsd.org, jack.vogel@gmail.com, atkin901@gmail.com > Date: Wednesday, January 9, 2013, 9:32 AM > > > 4BSD runs pretty well with > an SMP kernel. I can test ULE and compare > > > easily. A no SMP kernel is problematic as the igb > driver doesn't seem > > > to work and my onboard NICs are, sadly, igb. > > > > > this is bad luck. I know of the kernels as I have had > SMP and single > > CPU machines since 4.x times. > > I have had igb working with both SMP and non-SMP kernel for > at least a > year or two, 8.x-STABLE. No specific problems. > > Steinar Haug, Nethelp consulting, sthaug@nethelp.no > Maybe a problem with "legacy interrupts" on more modern processors? I'm using an E5520 and while the NIC inits ok, it just doesnt seem to gen interrupts. I can't spend much time debugging it.... I notice that HAMMER kernels use MSI/X interrupts whether SMP is enabled or not, while i386 kernels seem to require APIC. Is there some physical reason for this? BChome | help
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