Hi all,
Which would you recommend for a 4GB+ machine?
A 32-bit install with PAE-enabled kernel or just use 64-bit?
Regards, Matt
At Tue, 9 Jun 2009 09:42:50 +0800 CentOS mailing list centos@centos.org wrote:
Hi all,
Which would you recommend for a 4GB+ machine?
A 32-bit install with PAE-enabled kernel or just use 64-bit?
It depends...
If you are not doing anything that needs a 64-bit address space, then 32-bit w/PAE will work just fine.
Regards, Matt
Hi,
On Mon, Jun 8, 2009 at 22:28, Robert Hellerheller@deepsoft.com wrote:
At Tue, 9 Jun 2009 09:42:50 +0800 CentOS mailing list centos@centos.org wrote:
Which would you recommend for a 4GB+ machine? A 32-bit install with PAE-enabled kernel or just use 64-bit?
If you are not doing anything that needs a 64-bit address space, then 32-bit w/PAE will work just fine.
Yes, but I would recommend you to go with 64-bit OS anyways.
Even though PAE might work reasonably well if you have 4GB or 6GB or 8GB and with your current applications, 64-bit will keep working well when you need to upgrade your machine to 16GB or 32GB and run additional applications or newer versions that need to address more than 4GB per process.
HTH, Filipe
On Mon, Jun 8, 2009 at 8:30 PM, Filipe Brandenburgerfilbranden@gmail.com wrote:
Even though PAE might work reasonably well if you have 4GB or 6GB or 8GB and with your current applications, 64-bit will keep working well when you need to upgrade your machine to 16GB or 32GB and run additional applications or newer versions that need to address more than 4GB per process.
Indeed. This reminded me of the incorrect description about kernel-PAE in the CentOS documentaion. I filed a request to correct it in this bug tracker:
http://bugs.centos.org/view.php?id=3231
Akemi
On Tue, Jun 9, 2009 at 2:09 PM, Akemi Yagiamyagi@gmail.com wrote:
On Mon, Jun 8, 2009 at 8:30 PM, Filipe Brandenburgerfilbranden@gmail.com wrote:
Even though PAE might work reasonably well if you have 4GB or 6GB or 8GB and with your current applications, 64-bit will keep working well when you need to upgrade your machine to 16GB or 32GB and run additional applications or newer versions that need to address more than 4GB per process.
Indeed. This reminded me of the incorrect description about kernel-PAE in the CentOS documentaion. I filed a request to correct it in this bug tracker:
Thanks guys.
It's 64-bit then.
From: Filipe Brandenburger filbranden@gmail.com
Which would you recommend for a 4GB+ machine? A 32-bit install with PAE-enabled kernel or just use 64-bit?
If you are not doing anything that needs a 64-bit address space, then 32-bit w/PAE will work just fine.
Yes, but I would recommend you to go with 64-bit OS anyways. Even though PAE might work reasonably well if you have 4GB or 6GB or 8GB and with your current applications, 64-bit will keep working well when you need to upgrade your machine to 16GB or 32GB and run additional applications or newer versions that need to address more than 4GB per process.
I also read somewhere that enabling PAE would take some of the memory away from some components (PCI? Bus?)... If you have 4GB, without PAE, you get 3.3GB. With PAE, you get 4GB. And it seemed to mean decreased performances. Anyone can confirm this?
JD
From: centos-bounces@centos.org on behalf of John Doe
From: Filipe Brandenburger filbranden@gmail.com
Which would you recommend for a 4GB+ machine? A 32-bit install with PAE-enabled kernel or just use 64-bit?
If you are not doing anything that needs a 64-bit address space, then 32-bit w/PAE will work just fine.
Yes, but I would recommend you to go with 64-bit OS anyways. Even though PAE might work reasonably well if you have 4GB or 6GB or 8GB and with your current applications, 64-bit will keep working well when you need to upgrade your machine to 16GB or 32GB and run additional applications or newer versions that need to address more than 4GB per process.
I also read somewhere that enabling PAE would take some of the memory away from some components (PCI? Bus?)... If you have 4GB, without PAE, you get 3.3GB. With PAE, you get 4GB. And it seemed to mean decreased performances. Anyone can confirm this?
JD
This is true, in a 4GB setup and PAE, you will see a 3/1 split where three GB are accessible and one GB is used by the kernel to do the mapping. So, if you have 6GB you really have 5, since PAE needs the first GB for addressing to the higher registers. To accomplish this, you will notice a slight performance loss (around 2 to 5 percent overall) to handle it, since 64bit addressing requires a few extra operations in a 32bit CPU versus a native 64bit chip. This is why if you can, just go with a 64bit install if you have larger RAM configurations, it performs better all 'round.
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