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authorThomas Schwinge <tschwinge@gnu.org>2011-11-30 21:21:45 +0100
committerThomas Schwinge <tschwinge@gnu.org>2011-11-30 21:21:45 +0100
commitbe4193108513f02439a211a92fd80e0651f6721b (patch)
treea8fa187c9a6d4ba806a1b7799fa82f712f667c4e /microkernel
parentbe49aa7ddec52e121d562e14d4d93fd301b05fbb (diff)
IRC.
Diffstat (limited to 'microkernel')
-rw-r--r--microkernel/mach/gnumach/memory_management.mdwn22
1 files changed, 22 insertions, 0 deletions
diff --git a/microkernel/mach/gnumach/memory_management.mdwn b/microkernel/mach/gnumach/memory_management.mdwn
index 43b99d83..ca2f42c4 100644
--- a/microkernel/mach/gnumach/memory_management.mdwn
+++ b/microkernel/mach/gnumach/memory_management.mdwn
@@ -80,3 +80,25 @@ IRC, freenode, #hurd, 2011-06-09
<braunr> wow
<braunr> i remember the linux support for 4G/4G split when there was enough
RAM to fill the kernel space with struct page entries
+
+
+IRC, freenode, #hurd, 2011-11-12
+
+ <youpi> well, the Hurd doesn't "artificially" limits itself to 1.5GiB
+ memory
+ <youpi> i386 has only 4GiB addressing space
+ <youpi> we currently chose 2GiB for the kernel and 2GiB for the userspace
+ <youpi> since kernel needs some mappings, that leaves only 1.5GiB usable
+ physical memory
+ <sea4ever`> Hm? 2GiB for kernel, 2GiB for userspace, 500MiB are used for
+ what?
+ <youpi> for mappings
+ <youpi> such as device iomap
+ <youpi> contiguous buffer allocation
+ <youpi> and such things
+ <sea4ever`> Ah, ok. You map things in kernel space into user space then.
+ <youpi> linux does the same without the "bigmem" support
+ <youpi> no, just in kernel space
+ <youpi> kernel space is what determines how much physical memory you can
+ address
+ <youpi> unless using the linux-said-awful "bigmem" support