[Linux-ia64] Re: Support for more than 2GB RAM

[Linux-ia64] Re: Support for more than 2GB RAM

[Christoph Rohland]

David Mosberger <davidm@hpl.hp.com> writes:

> >>>>> On 18 Jul 2000 14:40:42 +0200, Christoph Rohland <cr@sap.com> said:
> 
>   Christoph> Hi, Are there any plans to support more than 2GB RAM in
>   Christoph> the near future?
> 
> There never was a limit for 2GB.  4GB is no problem and more than 4GB
> works fine also except if there are 32-bit PCI devices that do DMA (or
> the machine has huge holes in the physical address space, which isn't
> true for the prototypes).  For the DMA issue, a solution is in the
> works (Goutham has been working on this).

So why do I get the following:

Linux version 2.4.0-0.8smp (root@boris.devel.redhat.com) (gcc version 2.9-ia64-0
00216-final) #1 SMP Sun Jun 18 00:32:35 EDT 2000
EFI v0.92 by INTEL AL460GX.86B.0027.D27.021800: SALsystab=0x7ff29d60 ACPI=0x7ffd
9718 MPS=0x7ffd0000
map_pal_code: mapping PAL code [0x7ff40000-0x7ff7b000) into [0xe00000007fc00000-
0xe000000080000000)
Warning: ignoring 0MB of memory above 1GB!
Warning: ignoring 0MB of memory above 1GB!
Warning: ignoring 2046MB of memory above 1GB!

and I can only use 2GB of my 4GB machine?

Greetings
		Christoph

RE: [Linux-ia64] Re: Support for more than 2GB RAM

[Akbar A.]

>and I can only use 2GB of my 4GB machine?
pardon my naivety, but wasn't the whole point of moving to the the 64 bit
architecture was to push and solve the problems of--
	o larger numbers.
	o allowing more memory.
	o larger number transactions (finance and tax applications)
	o large disk sizes, etc..
	o higher precision in scientfic simulators, and other simuation machines.
As well as to get ride of the control Microsoft has over the IBM's and
dells. Just had to add that bit in there, read the court findings you know.


take care,
akbar A.

"We want technology for the sake of the story, not for its own sake. When
you look back, say 10 years from now, current technology will seem quaint"
Pixars' Edwin Catmull.


-----Original Message-----
From: linux-ia64-admin@linuxia64.org
[mailto:linux-ia64-admin@linuxia64.org]On Behalf Of Christoph Rohland
Sent: Wednesday, July 19, 2000 4:07 AM
To: davidm@hpl.hp.com
Cc: linux-ia64@linuxia64.org
Subject: [Linux-ia64] Re: Support for more than 2GB RAM


David Mosberger <davidm@hpl.hp.com> writes:

> >>>>> On 18 Jul 2000 14:40:42 +0200, Christoph Rohland <cr@sap.com> said:
>
>   Christoph> Hi, Are there any plans to support more than 2GB RAM in
>   Christoph> the near future?
>
> There never was a limit for 2GB.  4GB is no problem and more than 4GB
> works fine also except if there are 32-bit PCI devices that do DMA (or
> the machine has huge holes in the physical address space, which isn't
> true for the prototypes).  For the DMA issue, a solution is in the
> works (Goutham has been working on this).

So why do I get the following:

Linux version 2.4.0-0.8smp (root@boris.devel.redhat.com) (gcc version
2.9-ia64-0
00216-final) #1 SMP Sun Jun 18 00:32:35 EDT 2000
EFI v0.92 by INTEL AL460GX.86B.0027.D27.021800: SALsystab=0x7ff29d60
ACPI=0x7ffd
9718 MPS=0x7ffd0000
map_pal_code: mapping PAL code [0x7ff40000-0x7ff7b000) into
[0xe00000007fc00000-
0xe000000080000000)
Warning: ignoring 0MB of memory above 1GB!
Warning: ignoring 0MB of memory above 1GB!
Warning: ignoring 2046MB of memory above 1GB!

and I can only use 2GB of my 4GB machine?

Greetings
		Christoph



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[Linux-ia64] Re: Support for more than 2GB RAM

[Christoph Rohland]

"Akbar A." <syedali011@earthlink.net> writes:

> >and I can only use 2GB of my 4GB machine?
> pardon my naivety, but wasn't the whole point of moving to the the 64 bit
> architecture was to push and solve the problems of--
> 	o larger numbers.
> 	o allowing more memory.
> 	o larger number transactions (finance and tax applications)
> 	o large disk sizes, etc..
> 	o higher precision in scientfic simulators, and other simuation machines.
> As well as to get ride of the control Microsoft has over the IBM's and
> dells. Just had to add that bit in there, read the court findings you know.

Yes, of course 64Bit makes it much easier to support and deploy more
memory. But there are still some issues to resolve, like PCI cards
which can only access 2GB of memory. So there is often a (transient)
limitation on maximum memory supported.

Greetings
		Christoph

[Linux-ia64] Re: Support for more than 2GB RAM

[David Mosberger]

You should be able to change that check to 4GB without ill effects.
(The 1GB check is there for historical reasons.)  Anyhow, if this
isn't urgent, I'd just wait until Goutham is done with the PCI DMA
implementation and then that check will go away completely.

	--david

>>>>> On 19 Jul 2000 11:07:15 +0200, Christoph Rohland <cr@sap.com> said:

  Christoph> David Mosberger <davidm@hpl.hp.com> writes:
  >> >>>>> On 18 Jul 2000 14:40:42 +0200, Christoph Rohland
  >> <cr@sap.com> said:
  >> 
  Christoph> Hi, Are there any plans to support more than 2GB RAM in
  Christoph> the near future?
  >>  There never was a limit for 2GB.  4GB is no problem and more
  >> than 4GB works fine also except if there are 32-bit PCI devices
  >> that do DMA (or the machine has huge holes in the physical
  >> address space, which isn't true for the prototypes).  For the DMA
  >> issue, a solution is in the works (Goutham has been working on
  >> this).

  Christoph> So why do I get the following:

  Christoph> Linux version 2.4.0-0.8smp (root@boris.devel.redhat.com)
  Christoph> (gcc version 2.9-ia64-0 00216-final) #1 SMP Sun Jun 18
  Christoph> 00:32:35 EDT 2000 EFI v0.92 by INTEL
  Christoph> AL460GX.86B.0027.D27.021800: SALsystab=0x7ff29d60
  Christoph> ACPI=0x7ffd 9718 MPS=0x7ffd0000 map_pal_code: mapping PAL
  Christoph> code [0x7ff40000-0x7ff7b000) into [0xe00000007fc00000-
  Christoph> 0xe000000080000000) Warning: ignoring 0MB of memory above
  Christoph> 1GB!  Warning: ignoring 0MB of memory above 1GB!
  Christoph> Warning: ignoring 2046MB of memory above 1GB!

  Christoph> and I can only use 2GB of my 4GB machine?

  Christoph> Greetings Christoph

RE: [Linux-ia64] Re: Support for more than 2GB RAM

[Mallick, Asit K]

We are making good progress with the PCI DMA implementation and we should
have a patch by end of this week. This will remove the 2GB RAM check adn
will use all the memory in the system.

--Asit


> -----Original Message-----
> From: David Mosberger [mailto:davidm@hpl.hp.com]
> Sent: Wednesday, July 19, 2000 8:22 AM
> To: Christoph Rohland
> Cc: linux-ia64@linuxia64.org
> Subject: [Linux-ia64] Re: Support for more than 2GB RAM
> 
> 
> You should be able to change that check to 4GB without ill effects.
> (The 1GB check is there for historical reasons.)  Anyhow, if this
> isn't urgent, I'd just wait until Goutham is done with the PCI DMA
> implementation and then that check will go away completely.
> 
> 	--david
> 
> >>>>> On 19 Jul 2000 11:07:15 +0200, Christoph Rohland 
> <cr@sap.com> said:
> 
>   Christoph> David Mosberger <davidm@hpl.hp.com> writes:
>   >> >>>>> On 18 Jul 2000 14:40:42 +0200, Christoph Rohland
>   >> <cr@sap.com> said:
>   >> 
>   Christoph> Hi, Are there any plans to support more than 2GB RAM in
>   Christoph> the near future?
>   >>  There never was a limit for 2GB.  4GB is no problem and more
>   >> than 4GB works fine also except if there are 32-bit PCI devices
>   >> that do DMA (or the machine has huge holes in the physical
>   >> address space, which isn't true for the prototypes).  For the DMA
>   >> issue, a solution is in the works (Goutham has been working on
>   >> this).
> 
>   Christoph> So why do I get the following:
> 
>   Christoph> Linux version 2.4.0-0.8smp (root@boris.devel.redhat.com)
>   Christoph> (gcc version 2.9-ia64-0 00216-final) #1 SMP Sun Jun 18
>   Christoph> 00:32:35 EDT 2000 EFI v0.92 by INTEL
>   Christoph> AL460GX.86B.0027.D27.021800: SALsystab=0x7ff29d60
>   Christoph> ACPI=0x7ffd 9718 MPS=0x7ffd0000 map_pal_code: mapping PAL
>   Christoph> code [0x7ff40000-0x7ff7b000) into [0xe00000007fc00000-
>   Christoph> 0xe000000080000000) Warning: ignoring 0MB of memory above
>   Christoph> 1GB!  Warning: ignoring 0MB of memory above 1GB!
>   Christoph> Warning: ignoring 2046MB of memory above 1GB!
> 
>   Christoph> and I can only use 2GB of my 4GB machine?
> 
>   Christoph> Greetings Christoph
> 
> 
> _______________________________________________
> Linux-IA64 mailing list
> Linux-IA64@linuxia64.org
> http://lists.linuxia64.org/lists/listinfo/linux-ia64
> 

[Linux-ia64] Re: Support for more than 2GB RAM

[Christoph Rohland]

"Mallick, Asit K" <asit.k.mallick@intel.com> writes:

> We are making good progress with the PCI DMA implementation and we should
> have a patch by end of this week. This will remove the 2GB RAM check adn
> will use all the memory in the system.

Great! Waiting for that (and collecting memory ;-))

Greetings
		Christoph