> > > > então o que eu estou falando que um processador de 32 bits consegue no > maximo acessar 4GB de memória. > quanto é 4.294.967.296 ???? > 4GB
Consegu usar, mas não fica disponível todos os 4 GB para usar alocar no SO Uma fonte interessante: http://www.microsoft.com/whdc/system/platform/server/PAE/pae_os.mspx "Given the method with which PCI addresses memory beyond 32 bits, there is a failure mode that is subtle. Any I/O range that "spans" across two 4-GB regions must be treated specially. If not, the address range will be correctly decoded for only one part of the transfer and the remaining part will be transposed to an incorrect memory location. This will corrupt memory and will crash the system, crash the application, or silently corrupt data at that location. Applications cannot prevent this because they are only presented virtual addresses and have no visibility to the physical level. All operating systems that use PAE face this problem, but some do not explicitly prevent this from occurring and instead depend on the device driver to take the correct actions." "As the physical memory increases, the relative amount of I/O addresses beyond 32 bits also increases in relation to those addresses below 32 bits. In most cases, the operating system transparently provides double buffering, although some Unix variants do not provide any assistance in this function and require any 32-bit devices and drivers to manage their own double buffering routines and allocations." Com "PAE" ativo seriam então 36 bits... ou seja tem a limitação da plataforma 32bits como um todo, no máximo tu vai conseguir 3,72 GB kernel/user space (creio eu). Att Alex. -- Interessado em aprender mais sobre o Ubuntu em português? http://wiki.ubuntu-br.org/ComeceAqui - ubuntu-br mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-br
