Date: Wed, 10 Feb 2010 10:46:23 -0800 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: freebsd-stable@freebsd.org Subject: Re: Strange problem with 8-stable, VMWare vSphere 4 & AMD CPUs (unexpected shutdowns) Message-ID: <20100210184623.GA78851@icarus.home.lan> In-Reply-To: <9bbcef731002101038r1ac04141t505216816489376f@mail.gmail.com> References: <hkujop$hsa$1@ger.gmane.org> <4B72D94A.8030509@icyb.net.ua> <hkup1g$763$1@ger.gmane.org> <4B72E93C.80102@icyb.net.ua> <9bbcef731002101003r203f5189xf139700a0d48afa0@mail.gmail.com> <4B72F67F.4000209@icyb.net.ua> <9bbcef731002101026k5007075cqf97fc80404ac3fa7@mail.gmail.com> <4B72FC55.2090508@icyb.net.ua> <9bbcef731002101038r1ac04141t505216816489376f@mail.gmail.com>
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On Wed, Feb 10, 2010 at 07:38:37PM +0100, Ivan Voras wrote: > On 10 February 2010 19:35, Andriy Gapon <avg@icyb.net.ua> wrote: > > on 10/02/2010 20:26 Ivan Voras said the following: > >> On 10 February 2010 19:10, Andriy Gapon <avg@icyb.net.ua> wrote: > >>> on 10/02/2010 20:03 Ivan Voras said the following: > >>>> When you say "very unique" is it in the "it is not Linux or Windows" > >>>> sense or do we do something nonstandard? > >>> The former - neither Linux, Windows or OpenSolaris seem to have what we have. > >> > >> I can't find the exact documents but I think both Windows > >> MegaUltimateServer (the highest priced version of Windows Server, > >> whatever it's called today) and Linux (though disabled and marked > >> Experimental) have it, or have some kind of support for large pages > >> that might not be as pervasive (maybe they use it for kernel only?). I > >> have no idea about (Open)Solaris. > > > > I haven't said that those OSes do not use large pages. > > I've said what I've said :-) > > Ok :) > > Is there a difference between "large pages" as they are commonly known > and "superpages" as in FreeBSD ? In other words - are you referencing > some specific mechanism, like automatic promotion / demotion of the > large pages or maybe something else? I read what Andriy wrote to mean that the way FreeBSD utilises 4MB TLB on certain models of AMD processors is broken/quirky, and on those CPUs, users should stick to vm.pmap.pg_ps_enabled="0" (loader.conf). -- | Jeremy Chadwick jdc@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
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