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Subject: SUMMARY: PAE-kernel? - msg#00005List: linux.admin.managers> Warning only 4GB will be used. > Use a PAE enabled kernel. > 3200MB HIGHMEM available. > 896MB LOWMEM available. > > Top reports: > > I am using a 2.6.12 kernel here and could not find anything in the > kernel documentation about how to enable a PAE kernel. In the menu > (from make menuconfig) there was no menu-option about PAE. When I > search for PAE I found: "Symbol: X86_PAE [=n] ". So I put > CONFIG_X86_PAE=y in .config but it was removed when I built the > kernel. I discovered CONFIG_HIGHMEM64G=y is the way to make the kernel PAE-enabled. The kernel with that option now shows: 4224MB HIGHMEM available. 896MB LOWMEM available. Regards Johann -- Johann Spies Telefoon: 021-808 4036 Informasietegnologie, Universiteit van Stellenbosch "Trust in the Lord with all your heart, and do not lean on your own understanding." Proverbs 3:5 _______________________________________________ LinuxManagers mailing list - http://www.linuxmanagers.org submissions: LinuxManagers-35TzE1X9F6582KRnZfj+bdi2O/JbrIOy@xxxxxxxxxxxxxxxx subscribe/unsubscribe: http://www.linuxmanagers.org/mailman/listinfo/linuxmanagers Thread at a glance:
Previous Message by Date: click to view message previewPAE-kernel?In dmesg on a server with 4Gb Ram I read: BIOS-provided physical RAM map: BIOS-e820: 0000000000000000 - 00000000000a0000 (usable) BIOS-e820: 0000000000100000 - 00000000bffc0000 (usable) BIOS-e820: 00000000bffc0000 - 00000000bffcfc00 (ACPI data) BIOS-e820: 00000000bffcfc00 - 00000000bffff000 (reserved) BIOS-e820: 00000000e0000000 - 00000000fec90000 (reserved) BIOS-e820: 00000000fed00000 - 00000000fed00400 (reserved) BIOS-e820: 00000000fee00000 - 00000000fee10000 (reserved) BIOS-e820: 00000000ffb00000 - 0000000100000000 (reserved) BIOS-e820: 0000000100000000 - 0000000140000000 (usable) Warning only 4GB will be used. Use a PAE enabled kernel. 3200MB HIGHMEM available. 896MB LOWMEM available. Top reports: Mem: 3105844k total and free -m: $ free -m total used free shared buffers cached Mem: 3033 2853 179 0 407 2132 I have search Google about this and according to an answer of Alan Cox a memory map like this will case the last part ( BIOS-e820: 0000000100000000 - 0000000140000000 (usable)) not to be used. It also seems that PAE-enabled kernels are a bit slower than the others if I understand it correctly. I am using a 2.6.12 kernel here and could not find anything in the kernel documentation about how to enable a PAE kernel. In the menu (from make menuconfig) there was no menu-option about PAE. When I search for PAE I found: "Symbol: X86_PAE [=n] ". So I put CONFIG_X86_PAE=y in .config but it was removed when I built the kernel. There are references to using the kernel parameter mem= in conjunction with mmap= but I am not sure how to use it in this case. I have also come across a kernel patch "kernel-patch-lkcd_7.0.5.1_all.deb" but I am not sure how trustworthy it is. Any ideas on how to get my kernel to use the full memory? Regards Johann -- Johann Spies Telefoon: 021-808 4036 Informasietegnologie, Universiteit van Stellenbosch "Trust in the Lord with all your heart, and do not lean on your own understanding." Proverbs 3:5 Vrywaring: Jy hoef eintlik net die e-pos self te gelees het. :) Disclaimer: If you are reading this you are wasting your time :) _______________________________________________ LinuxManagers mailing list - http://www.linuxmanagers.org submissions: LinuxManagers-35TzE1X9F6582KRnZfj+bdi2O/JbrIOy@xxxxxxxxxxxxxxxx subscribe/unsubscribe: http://www.linuxmanagers.org/mailman/listinfo/linuxmanagers Next Message by Date: click to view message preview(unknown)youkind-Re5JQEeQqe8AvxtiuMwx3w@xxxxxxxxxxxxxxxx _______________________________________________ LinuxManagers mailing list - http://www.linuxmanagers.org submissions: LinuxManagers-35TzE1X9F6582KRnZfj+bdi2O/JbrIOy@xxxxxxxxxxxxxxxx subscribe/unsubscribe: http://www.linuxmanagers.org/mailman/listinfo/linuxmanagers Previous Message by Thread: click to view message previewPAE-kernel?In dmesg on a server with 4Gb Ram I read: BIOS-provided physical RAM map: BIOS-e820: 0000000000000000 - 00000000000a0000 (usable) BIOS-e820: 0000000000100000 - 00000000bffc0000 (usable) BIOS-e820: 00000000bffc0000 - 00000000bffcfc00 (ACPI data) BIOS-e820: 00000000bffcfc00 - 00000000bffff000 (reserved) BIOS-e820: 00000000e0000000 - 00000000fec90000 (reserved) BIOS-e820: 00000000fed00000 - 00000000fed00400 (reserved) BIOS-e820: 00000000fee00000 - 00000000fee10000 (reserved) BIOS-e820: 00000000ffb00000 - 0000000100000000 (reserved) BIOS-e820: 0000000100000000 - 0000000140000000 (usable) Warning only 4GB will be used. Use a PAE enabled kernel. 3200MB HIGHMEM available. 896MB LOWMEM available. Top reports: Mem: 3105844k total and free -m: $ free -m total used free shared buffers cached Mem: 3033 2853 179 0 407 2132 I have search Google about this and according to an answer of Alan Cox a memory map like this will case the last part ( BIOS-e820: 0000000100000000 - 0000000140000000 (usable)) not to be used. It also seems that PAE-enabled kernels are a bit slower than the others if I understand it correctly. I am using a 2.6.12 kernel here and could not find anything in the kernel documentation about how to enable a PAE kernel. In the menu (from make menuconfig) there was no menu-option about PAE. When I search for PAE I found: "Symbol: X86_PAE [=n] ". So I put CONFIG_X86_PAE=y in .config but it was removed when I built the kernel. There are references to using the kernel parameter mem= in conjunction with mmap= but I am not sure how to use it in this case. I have also come across a kernel patch "kernel-patch-lkcd_7.0.5.1_all.deb" but I am not sure how trustworthy it is. Any ideas on how to get my kernel to use the full memory? Regards Johann -- Johann Spies Telefoon: 021-808 4036 Informasietegnologie, Universiteit van Stellenbosch "Trust in the Lord with all your heart, and do not lean on your own understanding." Proverbs 3:5 Vrywaring: Jy hoef eintlik net die e-pos self te gelees het. :) Disclaimer: If you are reading this you are wasting your time :) _______________________________________________ LinuxManagers mailing list - http://www.linuxmanagers.org submissions: LinuxManagers-35TzE1X9F6582KRnZfj+bdi2O/JbrIOy@xxxxxxxxxxxxxxxx subscribe/unsubscribe: http://www.linuxmanagers.org/mailman/listinfo/linuxmanagers Next Message by Thread: click to view message preview(unknown)youkind-Re5JQEeQqe8AvxtiuMwx3w@xxxxxxxxxxxxxxxx _______________________________________________ LinuxManagers mailing list - http://www.linuxmanagers.org submissions: LinuxManagers-35TzE1X9F6582KRnZfj+bdi2O/JbrIOy@xxxxxxxxxxxxxxxx subscribe/unsubscribe: http://www.linuxmanagers.org/mailman/listinfo/linuxmanagers Loading Comments...
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