[THIN] Re: Win2k kernel memory config
- From: "Brian Madden" <brian@xxxxxxxxxxxxxxx>
- To: <thin@xxxxxxxxxxxxx>
- Date: Tue, 27 Jan 2004 22:49:03 -0500
Hi Brian,
So, for your first question I guess you're asking "How can the system keep
track of what's where in physical memory and the pagefile if the tracking
system itself could be paged to disk?"
haha.. Great question!
The PTE table is "technically" part of the non-paged pool, which means it
can never ever be paged to disk. This means that it's always stored in
physical memory. Since the ratio between the non paged pool, PTEs, and paged
pool is set at boot time, the "offset" location of the PTE table in the non
paged pool never changes.
As for the system PTE limit, the actual size of the PTE table is 660MB or
1.3GB. (Incredible, I know!) Such huge sizes are necessary to keep track of
what's where in multi-GB multi-user situations. And, all this comes out of
the "meager" 2GB kernel space. :-(
It's funny that it you add up the "maximum" sizes of the various kernel mode
memory components you get (for a win 2000) example:
4MB Hyperspace
470MB Paged pool (there are two of these pools for single proc systems and
four for multi procs)
660MB PTEs
256MB non paged pool
1024MB system cache
Quick math here... 2.8GB for single proc systems and 3.8GB for multi proc
systems. Of course all this must be crammed into 2GB!
Fun. It's like cutting a budget.
Brian
Brian Madden
brian@xxxxxxxxxxxxxxx
+1.202.302.3657
Visit www.brianmadden.com for in-depth Citrix, Terminal Server, and
server-based computing news and analysis, white papers, downloadable videos,
and product reviews.
-----Original Message-----
From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf
Of Brian Lilley
Sent: Tuesday, January 27, 2004 1:10 PM
To: 'thin@xxxxxxxxxxxxx'
Subject: [THIN] Win2k kernel memory config
All,
I'm struggling with understanding the kernal memory concepts on win2k. I
have found a description in mr Brian Madden's 'Terminal Server Performance
Tuning' guide, which by the way, is excellent and has cleared a number of
mysteries regards logon processes, but am now a bit stuck on understanding
what the System PTE's do.
I understand that the PTE's are simply page entries mapping virtual
addresses to physical addresses of the Kernels allocated 2GB of physical
memory.
However, Page 23 talks about the kernels memory area being made up of two
pools, paged and non-paged and an area in the middle called System Page
Table Entries and goes on to discuss how to balance between them, but isn't
the System PTE's the underlying mechanism that provides the paged and
non-paged memory areas with their locations in real memory??
Also, the guide talks about the PTE's totalling something of 600MB (win2k)
and 1.3GB (2003)... I presume this doesn't mean the table that holds the
mappings is 600MB but instead the referenceable memory is actuall 600MB..am
I making any sense??
I'm confused...
Brian Lilley
Systems Integration
Vivista Ltd
m - 07929 002501
e - brian.lilley@xxxxxxxxxxxxx
www.vivista.co.uk
"All I ask is a chance to prove that money can't make me happy."
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