Date: Thu, 11 Feb 2010 08:13:25 -0500 From: John Baldwin <jhb@freebsd.org> To: freebsd-hackers@freebsd.org Cc: freebsd-stable@freebsd.org, Ivan Voras <ivoras@freebsd.org>, Andriy Gapon <avg@icyb.net.ua> Subject: Re: Strange problem with 8-stable, VMWare vSphere 4 & AMD CPUs (unexpected shutdowns) Message-ID: <201002110813.26005.jhb@freebsd.org> In-Reply-To: <9bbcef731002101038r1ac04141t505216816489376f@mail.gmail.com> References: <hkujop$hsa$1@ger.gmane.org> <4B72FC55.2090508@icyb.net.ua> <9bbcef731002101038r1ac04141t505216816489376f@mail.gmail.com>
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On Wednesday 10 February 2010 1:38:37 pm 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? Yes, the automatic promotion / demotion. That is a far-less common feature. FreeBSD/i386 has used large pages for the kernel text as far back as at least 4.x, but that is not the same as superpages. Linux does not have automatic promotion / demotion to my knowledge. I do not know about other OS's. -- John Baldwin
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