Re: [gentoo-user] What is HIGHPTE option in kernel?
On Wed, 2005-08-31 at 20:32 +0200, Bastian Balthazar Bux wrote: > Ow Mun Heng wrote: > > [quote] > > Allocate 3rd-level pagetables from highmem (HIGHPTE) > > > > The VM uses one page table entry for each page of physical memory. > > For systems with a lot of RAM, this can be wasteful of precious > > low memory. Setting this option will put user-space page table > > entries in high memory. > > [/quote] > > > > I have 1.5Gb of RAM, will this be useful for me? > > > Not sure but: > 3rd-level pagetables are for systems with a *lot* of memory that don't > want to waste space in the lowest gig of mem (to keep addresses of high > mem.). > > So basically no advantage with 1.5 gig Ah.. I see. Thanks. (as it turns out, seems like my make oldconfig wasn't really using the old config. I had many iterations of my kernel being compiled with diff stuffs. Finally found that the 4GB option wasn't turned 'on') /me wonders when I will have >4GB of ram and load everything into RAM (and XFS filesystems). Can you say Super TUX? hehe.. -- Ow Mun Heng Gentoo/Linux on DELL D600 1.4Ghz 1.5GB RAM 98% Microsoft(tm) Free!! Neuromancer 09:53:42 up 11:52, 5 users, load average: 0.74, 1.25, 2.45 -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] What is HIGHPTE option in kernel?
On Wed, 2005-08-31 at 23:23 +0800, Ow Mun Heng wrote: > [quote] > Allocate 3rd-level pagetables from highmem (HIGHPTE) > > The VM uses one page table entry for each page of physical memory. > For systems with a lot of RAM, this can be wasteful of precious > low memory. Setting this option will put user-space page table > entries in high memory. > [/quote] > > I have 1.5Gb of RAM, will this be useful for me? > > -- > Ow Mun Heng > Gentoo/Linux on DELL D600 1.4Ghz 1.5GB RAM > 98% Microsoft(tm) Free!! > Neuromancer 23:23:18 up 3:33, 5 users, load average: 0.20, 0.70, 1.11 > > No -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] What is HIGHPTE option in kernel?
Ow Mun Heng wrote: > [quote] > Allocate 3rd-level pagetables from highmem (HIGHPTE) > > The VM uses one page table entry for each page of physical memory. > For systems with a lot of RAM, this can be wasteful of precious > low memory. Setting this option will put user-space page table > entries in high memory. > [/quote] > > I have 1.5Gb of RAM, will this be useful for me? > Not sure but: 3rd-level pagetables are for systems with a *lot* of memory that don't want to waste space in the lowest gig of mem (to keep addresses of high mem.). So basically no advantage with 1.5 gig Cheers -- gentoo-user@gentoo.org mailing list
[gentoo-user] What is HIGHPTE option in kernel?
[quote] Allocate 3rd-level pagetables from highmem (HIGHPTE) The VM uses one page table entry for each page of physical memory. For systems with a lot of RAM, this can be wasteful of precious low memory. Setting this option will put user-space page table entries in high memory. [/quote] I have 1.5Gb of RAM, will this be useful for me? -- Ow Mun Heng Gentoo/Linux on DELL D600 1.4Ghz 1.5GB RAM 98% Microsoft(tm) Free!! Neuromancer 23:23:18 up 3:33, 5 users, load average: 0.20, 0.70, 1.11 -- gentoo-user@gentoo.org mailing list
