Date: Sun, 28 Jun 2009 20:14:24 -0400 From: Nathanael Hoyle <nhoyle@hoyletech.com> To: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> Cc: freebsd-hackers@freebsd.org Subject: Re: large pages (amd64) Message-ID: <4A480760.50705@hoyletech.com> In-Reply-To: <alpine.BSF.2.00.0906281933580.1809@wojtek.tensor.gdynia.pl> References: <alpine.BSF.2.00.0906281933580.1809@wojtek.tensor.gdynia.pl>
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Wojciech Puchar wrote: > i enabled > vm.pmap.pg_ps_enabled: 1 > > > could you please explain what exactly this values means? > because i don't understand why promotions-demotions!=mappings > > vm.pmap.pde.promotions: 2703 > vm.pmap.pde.p_failures: 6290 > vm.pmap.pde.mappings: 610 > vm.pmap.pde.demotions: 289 > > > > > other question - tried enabling it on my i386 laptop (256 megs ram), > always mappings==0, while promitions>demotions>0. > > certainly there are apps that could be put on big pages, gimp editing > 40MB bitmap for example Just to be clear, since you say i386 (I presume you mean architecture), I believe the Physical Address Extensions which allowed 2MB Page Size bit to be set was introduced with Pentium Pro. Processors prior to this were limited to standard 4KB pages. -Nathanael
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