![]() | |||||||||||||
Messages in this thread |
There are 2MB pages as well. Probably would be a better choice than 4MB. Also only has a 2 tier paging mechanism instead of a 3 tier one when paging with 4KB which should help take care of the current slowdown with highmem. ----- Original Message ----- From: "Chris Wedgwood" <cw@f00f.org> To: "Marvin Justice" <mjustice@austin.rr.com> Cc: "Alan Cox" <alan@lxorguk.ukuu.org.uk>; "Benjamin LaHaise" <bcrl@redhat.com>; "Gerrit Huizenga" <gerrit@us.ibm.com>; "M. Edward Borasky" <znmeb@aracnet.com>; "Harald Holzer" <harald.holzer@eunet.at>; <linux-kernel@vger.kernel.org> Sent: Sunday, January 06, 2002 9:38 PM Subject: Re: i686 SMP systems with more then 12 GB ram with 2.4.x kernel ? > On Sun, Jan 06, 2002 at 08:18:33PM -0600, Marvin Justice wrote: > > Here's my (probably simple minded) understanding. With the PSE bit > turned on in one of the x86 control registers (cr3?), page sizes > are 4MB instead of the usual 4KB. One advantage of large pages is > that there are fewer page tables and struct page's to store. > > Ah, I knew 4MB pages were possible... I was under the impression _all_ > pages had to be 4MB which would seem to suck badly as they would be > too coarse for many applications (but for certain large sci. apps. I'm > sure this would be perfect, less TLB thrashing too with sparse > data-sets). > > On the whole, I'm not sure I can see how 4MB pages _everywhere_ in > user-space would be a win for many people at all... > > > --cw > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
| Last update: 2005-03-22 12:15 [from the cache] ©2003-2008 | |||||||||||||