Date: Sun, 22 Apr 2007 00:31:32 +0400 From: "Artem Kuchin" <matrix@itlegion.ru> To: "Andrew Pantyukhin" <infofarmer@FreeBSD.org> Cc: freebsd-stable@freebsd.org Subject: Re: PAE does not give any ram increase, why? Message-ID: <000c01c78454$0e8c1810$0c00a8c0@Artem> References: <Pine.BSF.3.96.1070421185323.7357E-100000@gaia.nimnet.asn.au><004b01c78421$062195c0$0c00a8c0@Artem> <cb5206420704211139o61b93b3cs4f5fa3fa7f08659a@mail.gmail.com>
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Andrew Pantyukhin wrote: > On 4/21/07, Artem Kuchin <matrix@itlegion.ru> wrote: >> Hello! >> >> I've upgraded one of my servers today. >> Now it is >> Asus P5p800-VM >> Pentium D 3.0Ghz >> 4GB RAM (4x1 GB) >> 3WARE raid5 >> >> FreebSD 6.2 cvsed today compiled from sources. >> >> after that i decided to try PAE. It runs just fine but >> when i compare available memory with and without >> pae i do not see any difference. >> >> At kernel boot with PAE it says: >> >> pr 21 18:01:30 osiris kernel: ACPI APIC Table: <A M I OEMAPIC > >> Apr 21 18:01:30 osiris kernel: Timecounter "i8254" frequency 1193182 >> Hz quality 0 >> Apr 21 18:01:30 osiris kernel: CPU: Intel(R) Pentium(R) D CPU >> 3.00GHz (3000.33-MHz 686-class CPU) Apr 21 18:01:30 osiris kernel: >> Origin = "GenuineIntel" Id = 0xf64 Stepping = 4 >> Apr 21 18:01:30 osiris kernel: >> Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2 >> Apr 21 18:01:30 osiris kernel: >> Features2=0xe49d<SSE3,RSVD2,MON,DS_CPL,EST,CNTX-ID,CX16,<b14>,<b15>> >> Apr 21 18:01:30 osiris kernel: AMD Features=0x20000000<LM> >> Apr 21 18:01:30 osiris kernel: AMD Features2=0x1<LAHF> >> Apr 21 18:01:30 osiris kernel: Cores per package: 2 >> Apr 21 18:01:30 osiris kernel: real memory = 4017881088 (3831 MB) >> Apr 21 18:01:30 osiris kernel: avail memory = 3933429760 (3751 MB) >> >> The real and avail memory sizes are the same w/o PAE. >> >> Then i do >> sysctl -a | grep hw | grep mem >> >> and i always see >> hw.physmem: 4012244992 >> hw.usermem: 3861307392 >> hw.realmem: 4017881088 >> hw.pci.host_mem_start: 2147483648 >> >> the number do not change with or without PAE >> >> Maybe i look in the wrong place? > > What number do you expect to see? 8Gb? I expect to see DIFFERENCE (in particular INCREASE) in amount of memory with PAE comparing to kernel w/o PAE. And 4 GB = 1024*4 MB = 1024*1024*4 KB = = 1024*1024*1024*4=4294967296 So, where is my 277086208 bytes? (ieven is built-in video eats 128MB for AGP aperture then still whene is my another almost 120MB?) -- Regards, Artem
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