/3gb and /pae switch

  • Thread starter Thread starter mhowell
  • Start date Start date
M

mhowell

Guest
I am still trying to completely understand this and I find conflicting
information.

If I have a Windows 2003 Enterprise server with 8 gb of physical ram
and an application that will take advantage of memory above 2 gig
would the following make sense.

Use the /3g and /pae switches in the boot.ini.


3 gb would goto the application and by using the /pae switch the 5gb
remainder would goto the operating system.


Is that correct?
 
Re: /3gb and /pae switch

Hello,

/3G gives 1G for the system, 3G for applications.
PAE allow application to access more memory through AWE.

The PAE memory is not like normal memory. The software can only use it for
special things. SQL for example only use the PAE memory as cache (in
difference to the classic memory part).

This is a sort of tuning, it will depend of your specific application and
what does the system (if it's a dc or not...)

--
Cordialement,
Mathieu CHATEAU
http://lordoftheping.blogspot.com


"mhowell" <mhowell@discussions.microsoft.com> wrote in message
news:E1E44E57-4244-4320-965F-D37D2BAA27FD@microsoft.com...
>I am still trying to completely understand this and I find conflicting
> information.
>
> If I have a Windows 2003 Enterprise server with 8 gb of physical ram
> and an application that will take advantage of memory above 2 gig
> would the following make sense.
>
> Use the /3g and /pae switches in the boot.ini.
>
>
> 3 gb would goto the application and by using the /pae switch the 5gb
> remainder would goto the operating system.
>
>
> Is that correct?
>
 
Re: /3gb and /pae switch

Ok.

So what if I have a file server that has 2 gb of ram with no applications.
It is only a file server.

How is the 2gb used? 1gb to the kernel and 1 gb for explorer.exe,
taskmgr.exe, etc.?


"Mathieu CHATEAU" wrote:

> Hello,
>
> /3G gives 1G for the system, 3G for applications.
> PAE allow application to access more memory through AWE.
>
> The PAE memory is not like normal memory. The software can only use it for
> special things. SQL for example only use the PAE memory as cache (in
> difference to the classic memory part).
>
> This is a sort of tuning, it will depend of your specific application and
> what does the system (if it's a dc or not...)
>
> --
> Cordialement,
> Mathieu CHATEAU
> http://lordoftheping.blogspot.com
>
>
> "mhowell" <mhowell@discussions.microsoft.com> wrote in message
> news:E1E44E57-4244-4320-965F-D37D2BAA27FD@microsoft.com...
> >I am still trying to completely understand this and I find conflicting
> > information.
> >
> > If I have a Windows 2003 Enterprise server with 8 gb of physical ram
> > and an application that will take advantage of memory above 2 gig
> > would the following make sense.
> >
> > Use the /3g and /pae switches in the boot.ini.
> >
> >
> > 3 gb would goto the application and by using the /pae switch the 5gb
> > remainder would goto the operating system.
> >
> >
> > Is that correct?
> >
>
>
 
Re: /3gb and /pae switch

You wouldn't use 3G with files server, that would shut down your performance

http://support.microsoft.com/kb/317249/en-us
Heavily stressed file servers should not use /3gb switch. The /PAE switch
alone will not cause any issue.

--
Cordialement,
Mathieu CHATEAU
http://lordoftheping.blogspot.com


"mhowell" <mhowell@discussions.microsoft.com> wrote in message
news:714773C5-AA8C-4316-AE8E-B30376C8DAEF@microsoft.com...
> Ok.
>
> So what if I have a file server that has 2 gb of ram with no applications.
> It is only a file server.
>
> How is the 2gb used? 1gb to the kernel and 1 gb for explorer.exe,
> taskmgr.exe, etc.?
>
>
> "Mathieu CHATEAU" wrote:
>
>> Hello,
>>
>> /3G gives 1G for the system, 3G for applications.
>> PAE allow application to access more memory through AWE.
>>
>> The PAE memory is not like normal memory. The software can only use it
>> for
>> special things. SQL for example only use the PAE memory as cache (in
>> difference to the classic memory part).
>>
>> This is a sort of tuning, it will depend of your specific application and
>> what does the system (if it's a dc or not...)
>>
>> --
>> Cordialement,
>> Mathieu CHATEAU
>> http://lordoftheping.blogspot.com
>>
>>
>> "mhowell" <mhowell@discussions.microsoft.com> wrote in message
>> news:E1E44E57-4244-4320-965F-D37D2BAA27FD@microsoft.com...
>> >I am still trying to completely understand this and I find conflicting
>> > information.
>> >
>> > If I have a Windows 2003 Enterprise server with 8 gb of physical ram
>> > and an application that will take advantage of memory above 2 gig
>> > would the following make sense.
>> >
>> > Use the /3g and /pae switches in the boot.ini.
>> >
>> >
>> > 3 gb would goto the application and by using the /pae switch the 5gb
>> > remainder would goto the operating system.
>> >
>> >
>> > Is that correct?
>> >
>>
>>
 
Re: /3gb and /pae switch

No, I mean don't use any switches. How is 2 gb of physical memory allocated
in the server?

I have a file server with 2 gb of ram and it has high pages/sec. I am
assuming that it just needs an additional 2gb of physical ram.


"Mathieu CHATEAU" wrote:

> You wouldn't use 3G with files server, that would shut down your performance
>
> http://support.microsoft.com/kb/317249/en-us
> Heavily stressed file servers should not use /3gb switch. The /PAE switch
> alone will not cause any issue.
>
> --
> Cordialement,
> Mathieu CHATEAU
> http://lordoftheping.blogspot.com
>
>
> "mhowell" <mhowell@discussions.microsoft.com> wrote in message
> news:714773C5-AA8C-4316-AE8E-B30376C8DAEF@microsoft.com...
> > Ok.
> >
> > So what if I have a file server that has 2 gb of ram with no applications.
> > It is only a file server.
> >
> > How is the 2gb used? 1gb to the kernel and 1 gb for explorer.exe,
> > taskmgr.exe, etc.?
> >
> >
> > "Mathieu CHATEAU" wrote:
> >
> >> Hello,
> >>
> >> /3G gives 1G for the system, 3G for applications.
> >> PAE allow application to access more memory through AWE.
> >>
> >> The PAE memory is not like normal memory. The software can only use it
> >> for
> >> special things. SQL for example only use the PAE memory as cache (in
> >> difference to the classic memory part).
> >>
> >> This is a sort of tuning, it will depend of your specific application and
> >> what does the system (if it's a dc or not...)
> >>
> >> --
> >> Cordialement,
> >> Mathieu CHATEAU
> >> http://lordoftheping.blogspot.com
> >>
> >>
> >> "mhowell" <mhowell@discussions.microsoft.com> wrote in message
> >> news:E1E44E57-4244-4320-965F-D37D2BAA27FD@microsoft.com...
> >> >I am still trying to completely understand this and I find conflicting
> >> > information.
> >> >
> >> > If I have a Windows 2003 Enterprise server with 8 gb of physical ram
> >> > and an application that will take advantage of memory above 2 gig
> >> > would the following make sense.
> >> >
> >> > Use the /3g and /pae switches in the boot.ini.
> >> >
> >> >
> >> > 3 gb would goto the application and by using the /pae switch the 5gb
> >> > remainder would goto the operating system.
> >> >
> >> >
> >> > Is that correct?
> >> >
> >>
> >>
>
>
 
Re: /3gb and /pae switch

http://www.microsoft.com/windowsserver2003/evaluation/performance/tuning.mspx

download the tuning.doc
Start reading page 27 : Performance Tuning for File Servers


--
Cordialement,
Mathieu CHATEAU
http://lordoftheping.blogspot.com


"mhowell" <mhowell@discussions.microsoft.com> wrote in message
news:79BB94B1-0D52-4A75-B082-3ACE4A430315@microsoft.com...
> No, I mean don't use any switches. How is 2 gb of physical memory
> allocated
> in the server?
>
> I have a file server with 2 gb of ram and it has high pages/sec. I am
> assuming that it just needs an additional 2gb of physical ram.
>
>
> "Mathieu CHATEAU" wrote:
>
>> You wouldn't use 3G with files server, that would shut down your
>> performance
>>
>> http://support.microsoft.com/kb/317249/en-us
>> Heavily stressed file servers should not use /3gb switch. The /PAE switch
>> alone will not cause any issue.
>>
>> --
>> Cordialement,
>> Mathieu CHATEAU
>> http://lordoftheping.blogspot.com
>>
>>
>> "mhowell" <mhowell@discussions.microsoft.com> wrote in message
>> news:714773C5-AA8C-4316-AE8E-B30376C8DAEF@microsoft.com...
>> > Ok.
>> >
>> > So what if I have a file server that has 2 gb of ram with no
>> > applications.
>> > It is only a file server.
>> >
>> > How is the 2gb used? 1gb to the kernel and 1 gb for explorer.exe,
>> > taskmgr.exe, etc.?
>> >
>> >
>> > "Mathieu CHATEAU" wrote:
>> >
>> >> Hello,
>> >>
>> >> /3G gives 1G for the system, 3G for applications.
>> >> PAE allow application to access more memory through AWE.
>> >>
>> >> The PAE memory is not like normal memory. The software can only use it
>> >> for
>> >> special things. SQL for example only use the PAE memory as cache (in
>> >> difference to the classic memory part).
>> >>
>> >> This is a sort of tuning, it will depend of your specific application
>> >> and
>> >> what does the system (if it's a dc or not...)
>> >>
>> >> --
>> >> Cordialement,
>> >> Mathieu CHATEAU
>> >> http://lordoftheping.blogspot.com
>> >>
>> >>
>> >> "mhowell" <mhowell@discussions.microsoft.com> wrote in message
>> >> news:E1E44E57-4244-4320-965F-D37D2BAA27FD@microsoft.com...
>> >> >I am still trying to completely understand this and I find
>> >> >conflicting
>> >> > information.
>> >> >
>> >> > If I have a Windows 2003 Enterprise server with 8 gb of physical ram
>> >> > and an application that will take advantage of memory above 2 gig
>> >> > would the following make sense.
>> >> >
>> >> > Use the /3g and /pae switches in the boot.ini.
>> >> >
>> >> >
>> >> > 3 gb would goto the application and by using the /pae switch the 5gb
>> >> > remainder would goto the operating system.
>> >> >
>> >> >
>> >> > Is that correct?
>> >> >
>> >>
>> >>
>>
>>
 
Re: /3gb and /pae switch

this one is useful too:
http://www.microsoft.com/technet/prodtechnol/windows2000serv/maintain/optimize/wperfch7.mspx



--
Cordialement,
Mathieu CHATEAU
http://lordoftheping.blogspot.com


"mhowell" <mhowell@discussions.microsoft.com> wrote in message
news:79BB94B1-0D52-4A75-B082-3ACE4A430315@microsoft.com...
> No, I mean don't use any switches. How is 2 gb of physical memory
> allocated
> in the server?
>
> I have a file server with 2 gb of ram and it has high pages/sec. I am
> assuming that it just needs an additional 2gb of physical ram.
>
>
> "Mathieu CHATEAU" wrote:
>
>> You wouldn't use 3G with files server, that would shut down your
>> performance
>>
>> http://support.microsoft.com/kb/317249/en-us
>> Heavily stressed file servers should not use /3gb switch. The /PAE switch
>> alone will not cause any issue.
>>
>> --
>> Cordialement,
>> Mathieu CHATEAU
>> http://lordoftheping.blogspot.com
>>
>>
>> "mhowell" <mhowell@discussions.microsoft.com> wrote in message
>> news:714773C5-AA8C-4316-AE8E-B30376C8DAEF@microsoft.com...
>> > Ok.
>> >
>> > So what if I have a file server that has 2 gb of ram with no
>> > applications.
>> > It is only a file server.
>> >
>> > How is the 2gb used? 1gb to the kernel and 1 gb for explorer.exe,
>> > taskmgr.exe, etc.?
>> >
>> >
>> > "Mathieu CHATEAU" wrote:
>> >
>> >> Hello,
>> >>
>> >> /3G gives 1G for the system, 3G for applications.
>> >> PAE allow application to access more memory through AWE.
>> >>
>> >> The PAE memory is not like normal memory. The software can only use it
>> >> for
>> >> special things. SQL for example only use the PAE memory as cache (in
>> >> difference to the classic memory part).
>> >>
>> >> This is a sort of tuning, it will depend of your specific application
>> >> and
>> >> what does the system (if it's a dc or not...)
>> >>
>> >> --
>> >> Cordialement,
>> >> Mathieu CHATEAU
>> >> http://lordoftheping.blogspot.com
>> >>
>> >>
>> >> "mhowell" <mhowell@discussions.microsoft.com> wrote in message
>> >> news:E1E44E57-4244-4320-965F-D37D2BAA27FD@microsoft.com...
>> >> >I am still trying to completely understand this and I find
>> >> >conflicting
>> >> > information.
>> >> >
>> >> > If I have a Windows 2003 Enterprise server with 8 gb of physical ram
>> >> > and an application that will take advantage of memory above 2 gig
>> >> > would the following make sense.
>> >> >
>> >> > Use the /3g and /pae switches in the boot.ini.
>> >> >
>> >> >
>> >> > 3 gb would goto the application and by using the /pae switch the 5gb
>> >> > remainder would goto the operating system.
>> >> >
>> >> >
>> >> > Is that correct?
>> >> >
>> >>
>> >>
>>
>>
 
Re: /3gb and /pae switch

Thanks. I will read the docs.

However, how is the 2 gb allocated in a file server?

"Mathieu CHATEAU" wrote:

> http://www.microsoft.com/windowsserver2003/evaluation/performance/tuning.mspx
>
> download the tuning.doc
> Start reading page 27 : Performance Tuning for File Servers
>
>
> --
> Cordialement,
> Mathieu CHATEAU
> http://lordoftheping.blogspot.com
>
>
> "mhowell" <mhowell@discussions.microsoft.com> wrote in message
> news:79BB94B1-0D52-4A75-B082-3ACE4A430315@microsoft.com...
> > No, I mean don't use any switches. How is 2 gb of physical memory
> > allocated
> > in the server?
> >
> > I have a file server with 2 gb of ram and it has high pages/sec. I am
> > assuming that it just needs an additional 2gb of physical ram.
> >
> >
> > "Mathieu CHATEAU" wrote:
> >
> >> You wouldn't use 3G with files server, that would shut down your
> >> performance
> >>
> >> http://support.microsoft.com/kb/317249/en-us
> >> Heavily stressed file servers should not use /3gb switch. The /PAE switch
> >> alone will not cause any issue.
> >>
> >> --
> >> Cordialement,
> >> Mathieu CHATEAU
> >> http://lordoftheping.blogspot.com
> >>
> >>
> >> "mhowell" <mhowell@discussions.microsoft.com> wrote in message
> >> news:714773C5-AA8C-4316-AE8E-B30376C8DAEF@microsoft.com...
> >> > Ok.
> >> >
> >> > So what if I have a file server that has 2 gb of ram with no
> >> > applications.
> >> > It is only a file server.
> >> >
> >> > How is the 2gb used? 1gb to the kernel and 1 gb for explorer.exe,
> >> > taskmgr.exe, etc.?
> >> >
> >> >
> >> > "Mathieu CHATEAU" wrote:
> >> >
> >> >> Hello,
> >> >>
> >> >> /3G gives 1G for the system, 3G for applications.
> >> >> PAE allow application to access more memory through AWE.
> >> >>
> >> >> The PAE memory is not like normal memory. The software can only use it
> >> >> for
> >> >> special things. SQL for example only use the PAE memory as cache (in
> >> >> difference to the classic memory part).
> >> >>
> >> >> This is a sort of tuning, it will depend of your specific application
> >> >> and
> >> >> what does the system (if it's a dc or not...)
> >> >>
> >> >> --
> >> >> Cordialement,
> >> >> Mathieu CHATEAU
> >> >> http://lordoftheping.blogspot.com
> >> >>
> >> >>
> >> >> "mhowell" <mhowell@discussions.microsoft.com> wrote in message
> >> >> news:E1E44E57-4244-4320-965F-D37D2BAA27FD@microsoft.com...
> >> >> >I am still trying to completely understand this and I find
> >> >> >conflicting
> >> >> > information.
> >> >> >
> >> >> > If I have a Windows 2003 Enterprise server with 8 gb of physical ram
> >> >> > and an application that will take advantage of memory above 2 gig
> >> >> > would the following make sense.
> >> >> >
> >> >> > Use the /3g and /pae switches in the boot.ini.
> >> >> >
> >> >> >
> >> >> > 3 gb would goto the application and by using the /pae switch the 5gb
> >> >> > remainder would goto the operating system.
> >> >> >
> >> >> >
> >> >> > Is that correct?
> >> >> >
> >> >>
> >> >>
> >>
> >>
>
>
 
Re: /3gb and /pae switch

Thanks. I will read the docs.

However, how is the 2 gb allocated in a file server?


"Mathieu CHATEAU" wrote:

> this one is useful too:
> http://www.microsoft.com/technet/prodtechnol/windows2000serv/maintain/optimize/wperfch7.mspx
>
>
>
> --
> Cordialement,
> Mathieu CHATEAU
> http://lordoftheping.blogspot.com
>
>
> "mhowell" <mhowell@discussions.microsoft.com> wrote in message
> news:79BB94B1-0D52-4A75-B082-3ACE4A430315@microsoft.com...
> > No, I mean don't use any switches. How is 2 gb of physical memory
> > allocated
> > in the server?
> >
> > I have a file server with 2 gb of ram and it has high pages/sec. I am
> > assuming that it just needs an additional 2gb of physical ram.
> >
> >
> > "Mathieu CHATEAU" wrote:
> >
> >> You wouldn't use 3G with files server, that would shut down your
> >> performance
> >>
> >> http://support.microsoft.com/kb/317249/en-us
> >> Heavily stressed file servers should not use /3gb switch. The /PAE switch
> >> alone will not cause any issue.
> >>
> >> --
> >> Cordialement,
> >> Mathieu CHATEAU
> >> http://lordoftheping.blogspot.com
> >>
> >>
> >> "mhowell" <mhowell@discussions.microsoft.com> wrote in message
> >> news:714773C5-AA8C-4316-AE8E-B30376C8DAEF@microsoft.com...
> >> > Ok.
> >> >
> >> > So what if I have a file server that has 2 gb of ram with no
> >> > applications.
> >> > It is only a file server.
> >> >
> >> > How is the 2gb used? 1gb to the kernel and 1 gb for explorer.exe,
> >> > taskmgr.exe, etc.?
> >> >
> >> >
> >> > "Mathieu CHATEAU" wrote:
> >> >
> >> >> Hello,
> >> >>
> >> >> /3G gives 1G for the system, 3G for applications.
> >> >> PAE allow application to access more memory through AWE.
> >> >>
> >> >> The PAE memory is not like normal memory. The software can only use it
> >> >> for
> >> >> special things. SQL for example only use the PAE memory as cache (in
> >> >> difference to the classic memory part).
> >> >>
> >> >> This is a sort of tuning, it will depend of your specific application
> >> >> and
> >> >> what does the system (if it's a dc or not...)
> >> >>
> >> >> --
> >> >> Cordialement,
> >> >> Mathieu CHATEAU
> >> >> http://lordoftheping.blogspot.com
> >> >>
> >> >>
> >> >> "mhowell" <mhowell@discussions.microsoft.com> wrote in message
> >> >> news:E1E44E57-4244-4320-965F-D37D2BAA27FD@microsoft.com...
> >> >> >I am still trying to completely understand this and I find
> >> >> >conflicting
> >> >> > information.
> >> >> >
> >> >> > If I have a Windows 2003 Enterprise server with 8 gb of physical ram
> >> >> > and an application that will take advantage of memory above 2 gig
> >> >> > would the following make sense.
> >> >> >
> >> >> > Use the /3g and /pae switches in the boot.ini.
> >> >> >
> >> >> >
> >> >> > 3 gb would goto the application and by using the /pae switch the 5gb
> >> >> > remainder would goto the operating system.
> >> >> >
> >> >> >
> >> >> > Is that correct?
> >> >> >
> >> >>
> >> >>
> >>
> >>
>
>
 
Re: /3gb and /pae switch

Windows 32 bits is divided into two memory part:
system
user

except with the /3G, they both have 2G of memory.

The system cache can have direct use of 960M.
It can use more memory, as standby list, let's say up to 8G.

4G would be just great


--
Cordialement,
Mathieu CHATEAU
http://lordoftheping.blogspot.com


"mhowell" <mhowell@discussions.microsoft.com> wrote in message
news:AE6A3ADF-5D95-40FA-9A4F-E80968927135@microsoft.com...
> Thanks. I will read the docs.
>
> However, how is the 2 gb allocated in a file server?
>
> "Mathieu CHATEAU" wrote:
>
>> http://www.microsoft.com/windowsserver2003/evaluation/performance/tuning.mspx
>>
>> download the tuning.doc
>> Start reading page 27 : Performance Tuning for File Servers
>>
>>
>> --
>> Cordialement,
>> Mathieu CHATEAU
>> http://lordoftheping.blogspot.com
>>
>>
>> "mhowell" <mhowell@discussions.microsoft.com> wrote in message
>> news:79BB94B1-0D52-4A75-B082-3ACE4A430315@microsoft.com...
>> > No, I mean don't use any switches. How is 2 gb of physical memory
>> > allocated
>> > in the server?
>> >
>> > I have a file server with 2 gb of ram and it has high pages/sec. I am
>> > assuming that it just needs an additional 2gb of physical ram.
>> >
>> >
>> > "Mathieu CHATEAU" wrote:
>> >
>> >> You wouldn't use 3G with files server, that would shut down your
>> >> performance
>> >>
>> >> http://support.microsoft.com/kb/317249/en-us
>> >> Heavily stressed file servers should not use /3gb switch. The /PAE
>> >> switch
>> >> alone will not cause any issue.
>> >>
>> >> --
>> >> Cordialement,
>> >> Mathieu CHATEAU
>> >> http://lordoftheping.blogspot.com
>> >>
>> >>
>> >> "mhowell" <mhowell@discussions.microsoft.com> wrote in message
>> >> news:714773C5-AA8C-4316-AE8E-B30376C8DAEF@microsoft.com...
>> >> > Ok.
>> >> >
>> >> > So what if I have a file server that has 2 gb of ram with no
>> >> > applications.
>> >> > It is only a file server.
>> >> >
>> >> > How is the 2gb used? 1gb to the kernel and 1 gb for explorer.exe,
>> >> > taskmgr.exe, etc.?
>> >> >
>> >> >
>> >> > "Mathieu CHATEAU" wrote:
>> >> >
>> >> >> Hello,
>> >> >>
>> >> >> /3G gives 1G for the system, 3G for applications.
>> >> >> PAE allow application to access more memory through AWE.
>> >> >>
>> >> >> The PAE memory is not like normal memory. The software can only use
>> >> >> it
>> >> >> for
>> >> >> special things. SQL for example only use the PAE memory as cache
>> >> >> (in
>> >> >> difference to the classic memory part).
>> >> >>
>> >> >> This is a sort of tuning, it will depend of your specific
>> >> >> application
>> >> >> and
>> >> >> what does the system (if it's a dc or not...)
>> >> >>
>> >> >> --
>> >> >> Cordialement,
>> >> >> Mathieu CHATEAU
>> >> >> http://lordoftheping.blogspot.com
>> >> >>
>> >> >>
>> >> >> "mhowell" <mhowell@discussions.microsoft.com> wrote in message
>> >> >> news:E1E44E57-4244-4320-965F-D37D2BAA27FD@microsoft.com...
>> >> >> >I am still trying to completely understand this and I find
>> >> >> >conflicting
>> >> >> > information.
>> >> >> >
>> >> >> > If I have a Windows 2003 Enterprise server with 8 gb of physical
>> >> >> > ram
>> >> >> > and an application that will take advantage of memory above 2 gig
>> >> >> > would the following make sense.
>> >> >> >
>> >> >> > Use the /3g and /pae switches in the boot.ini.
>> >> >> >
>> >> >> >
>> >> >> > 3 gb would goto the application and by using the /pae switch the
>> >> >> > 5gb
>> >> >> > remainder would goto the operating system.
>> >> >> >
>> >> >> >
>> >> >> > Is that correct?
>> >> >> >
>> >> >>
>> >> >>
>> >>
>> >>
>>
>>
 
Re: /3gb and /pae switch

Mathieu CHATEAU wrote:
> Hello,
>
> /3G gives 1G for the system, 3G for applications.
> PAE allow application to access more memory through AWE.
>
> The PAE memory is not like normal memory. The software can only use it
> for special things. SQL for example only use the PAE memory as cache (in
> difference to the classic memory part).

PAE memory? When you switch to PAE mode, you enable the processor to
address above 4GB. This is not special memory. And normal applications
can live here just fine, as they only sees virtual addresses.

The AWE API can be used to address more memory than the virtual memory
space allows
 
Re: /3gb and /pae switch

yeah, my mistake. I was speaking about the memory upper than 4G, which is
not "PAE memory", i should have said "memory accessed through the AWE API"


--
Cordialement,
Mathieu CHATEAU
http://lordoftheping.blogspot.com


"jorgen" <na@invalid> wrote in message
news:%23Mz4jt06HHA.4660@TK2MSFTNGP02.phx.gbl...
> Mathieu CHATEAU wrote:
>> Hello,
>>
>> /3G gives 1G for the system, 3G for applications.
>> PAE allow application to access more memory through AWE.
>>
>> The PAE memory is not like normal memory. The software can only use it
>> for special things. SQL for example only use the PAE memory as cache (in
>> difference to the classic memory part).
>
> PAE memory? When you switch to PAE mode, you enable the processor to
> address above 4GB. This is not special memory. And normal applications can
> live here just fine, as they only sees virtual addresses.
>
> The AWE API can be used to address more memory than the virtual memory
> space allows
 
Re: /3gb and /pae switch

Here's an excellent article on both /3GB and /PAE.

http://blogs.msdn.com/oldnewthing/archive/2004/08/22/218527.aspx

--
Kerry Brown
Microsoft MVP - Shell/User
http://www.vistahelp.ca


"mhowell" <mhowell@discussions.microsoft.com> wrote in message
news:E1E44E57-4244-4320-965F-D37D2BAA27FD@microsoft.com...
>I am still trying to completely understand this and I find conflicting
> information.
>
> If I have a Windows 2003 Enterprise server with 8 gb of physical ram
> and an application that will take advantage of memory above 2 gig
> would the following make sense.
>
> Use the /3g and /pae switches in the boot.ini.
>
>
> 3 gb would goto the application and by using the /pae switch the 5gb
> remainder would goto the operating system.
>
>
> Is that correct?
>
 
Re: /3gb and /pae switch

"mhowell" <mhowell@discussions.microsoft.com> wrote in message
news:9EF4D9A4-E3B3-4E1C-BDD2-11CB073310EC@microsoft.com...
> Thanks. I will read the docs.
>
> However, how is the 2 gb allocated in a file server?
>
>


It's not a linear mapping between virtual address space and physical RAM.
Your 2GB of physical RAM is dynamically allocated to different processes as
needed.

--
Kerry Brown
Microsoft MVP - Shell/User
http://www.vistahelp.ca
 
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